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Home » Cameras and Lenses

How to Spot Dust on Your DSLR Sensor

By Nasim Mansurov 65 Comments
Last Updated On September 23, 2018

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Are you getting frustrated with seeing small dark spots in your images that seem to show up in every image? If you see them consistently in the same location (the size and darkness of the spots can vary depending on aperture), you are most likely dealing with dust particles on your camera’s sensor. In this short article, I will show you a quick and easy way to identify sensor dust when shooting outdoors.

Table of Contents

  • What is sensor dust?
  • Dust/Dirt on the lens
  • Dust on the camera sensor
  • How to see sensor dust

What is sensor dust?

If you own a DSLR or mirrorless interchangeable lens camera, you will at some point have to deal with sensor dust, whether you like it or not. Dust is a normal fact of life and it is all around us, even at our homes that we try to keep clean at all times. The dust lands on both the lens and the camera body, and, due to the “breathing” mechanism of the lens while zooming in/out and focusing, the small dust particles end up getting sucked into the camera body. All lenses breathe one way or another or else the internal elements would not be able to move for autofocus and zoom functions. If you use more than one lens, the dust might be able to get into the camera body during the process of changing lenses.

Once the dust is in the camera body, it will either fall on the bottom of the camera or move around until it lands somewhere. Some dust particles land on the mirror inside the camera and others might end up getting stuck on the camera sensor. So, as you can see, there are three main areas where dust might settle in:

  1. The camera mirror – when dust ends up being on the camera mirror, you will not see it in your images, but you will see dust particles when you look through the viewfinder. This one is just annoying and it can be easily cleaned either with a small brush or a blower like Giotto’s Rocket Blower.
  2. The lens exterior, front and/or its back element – while very small dust particles will not affect image quality, the larger ones and dirt/grease will decrease contrast and might even possibly degrade image quality. Always make sure that both the front and the rear elements are clean and dust/dirt free.
  3. The camera sensor – the worst case scenario, because the dust particles will show up in every image, especially when stopped down to small apertures like f/10. Cleaning the camera sensor is not easy and the process requires special tools that need to be used with extreme care.

The first one is not a big deal – if you see some dust inside the viewfinder but you do not see it in your images, do not worry about it too much and only clean the mirror if it is too annoying for you. The second and third are the ones that can spoil your images and have a negative effect on affect image quality. Let’s talk about lens dirt first.

Dust/Dirt on the lens

How does dust, dirt and grease affect the image that comes out of your camera? Dust and dirt on the front element will rarely be visible, unless there is too much of it. Even then, you will not actually see any dots in your image, but rather will notice that your images are a little “hazy” or “cloudy”, which photographers simply call “decreased contrast”. If only a part of the front element is affected, for example an oily finger touched the front element, then you will see something like this:

Grease on front of the lens
NIKON D700 @ 16mm, ISO 200, 1/200, f/8.0

Note the white area inside the circle – that’s how oil/grease would affect the image. In many cases, you might see a color shift in addition to decreased contrast.

What about dust on the rear element? Take a look at the following image:

Dust on the rear lens element

See that large dark spot on the top of the frame? When I took the shot and looked at the viewfinder, I immediately knew that the rear element of the lens had a large dust spec on it, because neither the dust on the front of the lens, nor on the camera sensor looks anything like the above. I changed lenses in a very dusty and windy area (not a good thing to do) and something large ended up landing on the rear lens element before I mounted it on the camera. The result is a large dark circle in the frame!

Dust on the camera sensor

What about dust on the camera sensor? Dust on the camera sensor can be quickly identified from the following:

  1. The size and visibility of the dust particles will change as you change lens aperture. At maximum apertures on fast lenses such as Nikon 50mm f/1.4G, you might not even notice the dust particles in your images, which does not mean that they are not there. They will only be visible at smaller apertures such as f/4.0-f/5.6 and higher. As you increase aperture to a larger number, the dust will appear darker and more pronounced and the size of it will also get a little smaller.
  2. Dust particles will always appear in the same spots.
  3. Sensor dust can never be seen through the viewfinder, it only shows up in images. Even then, you might need to zoom in to 100% to see it. Larger dust particles and hair can be visible right away without having to zoom in (see example image below).

Here is an example of sensor dust:

Sensor Dust

Those three sensor dust specks ended up being on my sensor after a long day of driving through a very dusty area. As you can see, the dots are quite obvious and are much smaller than the earlier example of dust on the rear lens element. I used a small aperture of f/10 for this shot to get the bird in perfect focus, so the dust specks showed up right away.

How to see sensor dust

If your camera has dust on its sensor, you can quickly spot it by doing the following:

  1. Set your camera on Aperture Priority Mode.
  2. Set your metering mode to Matrix/Evaluative Metering.
  3. Set your camera ISO to the lowest number such as ISO 100 or 200.
  4. Turn off Auto ISO.
  5. Turn off autofocus and set your lens on manual focus.
  6. Set your aperture to the largest number available for your lens by rotating the camera dial. For example, the minimum aperture on the Nikon 50mm f/1.4G is f/16, so if I were shooting with this lens, I would set my aperture to f/16.
  7. If you are outside, point your camera up at the clear blue sky and take a picture. If you are indoors, find plain white paper, zoom in all the way so that the paper fits the whole frame, then make sure that the lens is completely out of focus and take a picture. If you are in front of a computer, open up a text editor such as Notepad, maximize it to the screen and then get as close to the monitor as possible so that only the white color is visible in the frame. Make sure that your focus is way off (completely out of focus) – that way only dust particles will be visible.
  8. Zoom in on the image (rear camera LCD), scroll from left to right and top to bottom all over the image and see if you can find any dark spots.
  9. If you cannot see any, your sensor is clean. If you see dark spots like in the above example, then your sensor has dust on it.

Here is a shot of the sky that I took at f/16 after seeing dust in my image:

Sensor Dust Test
NIKON D3S @ 24mm, ISO 200, 1/40, f/16.0

The large dark circle is dust on the rear element of the lens, while the dots and hair are both on the camera sensor. As you can probably tell, I had to do some cleaning of the sensor after I saw the above. I obviously did not do it on location, but in a dust-free environment as soon as I got back home.

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Filed Under: Cameras and Lenses Tagged With: DSLR Camera, Tips for Beginners, Sensor Dust

About Nasim Mansurov

Nasim Mansurov is the author and founder of Photography Life, based out of Denver, Colorado. He is recognized as one of the leading educators in the photography industry, conducting workshops, producing educational videos and frequently writing content for Photography Life. You can follow him on Instagram and Facebook. Read more about Nasim here.

Reader Interactions

Comments

  1. Gyula
    July 31, 2010 at 4:46 am

    Another useful article…thanks for sharing it with us!

    Reply
    • Nasim Mansurov
      August 18, 2010 at 1:03 pm

      You are most welcome Gyula!

      Reply
    • shekhar
      January 15, 2013 at 11:30 am

      i got my dslr sensor cleant at mata cameras and my lens had fungus also , now my complete set is perfect. this i guess is very good service in bangalore at mata cameras. contact details 9035871324. this service centre is at sp road bangalore

      Reply
  2. Pasquier
    August 1, 2010 at 3:06 am

    Hi Nasim
    this will be avery useful series – cleaning dust from the sensor is not a fun thing to do – keen to see what tips you offer. Best, P:)

    Reply
    • Nasim Mansurov
      August 18, 2010 at 1:04 pm

      Pasquier, yes, except I have not had time lately to write a guide on cleaning sensors yet ;-) Too much gear to test, too little time!

      Reply
  3. Aaron Priest
    August 1, 2010 at 4:58 am

    I’m curious as to why the aperture would matter to sensor dust. Why would it be clearer at a smaller aperture if it’s on the sensor? I would think the further the distance, the more the aperture would matter (like the rear lens element for example), and that it would make very little difference on the sensor. Are the filters in front of the CCD that thick that aperture would play that big a role in sharpness? Just pondering how things work… :-)

    Reply
    • Rodrigo
      August 1, 2010 at 9:30 am

      Hey Aaron maybe this can be the reason,

      You need light to hit on the sensor to be able to see the different colors, no light means black. You are already eliminating the possible blacks/shades by picking a nice plain, lighter, color background. So the last piece of the puzzle is a thin beam of light (minimum aperture) that can illuminate the sensor without being too bright/strong so that the glare could hide the “dark” specks. If I remember correctly the larger the aperture more light gets in, the harder it is to control because it will more easily bounce in all the lens surfaces.

      But maybe I’m wrong.

      Cheers,

      Reply
      • Aaron Priest
        August 1, 2010 at 9:44 am

        Rodrigo, you might be on to something! I did a little more research after reading your comment and thinking about it. I found this: www.dmcphoto.com/Artic…orBrushes/ Quoting a few sentences:

        “The surface being photographed should be no more than a few feet away. The idea is to make the item being photographed extremely out of focus so the only details in the final image will be dust spots and not features of the item being photographed. The small aperture makes the light rays between the back of the lens and image sensor parallel to one another and perpendicular to the glass sensor cover. That causes any dust on the glass cover to cast more distinct shadows on the image sensor. The long focal length makes it possible to assure the image is completely out of focus at the lens’s smallest aperture, which would be impossible with a very wide angle lens.”

        Reply
        • Nasim Mansurov
          August 18, 2010 at 1:11 pm

          Oops, looks like you already found the answer ;-)

          Reply
    • Nasim Mansurov
      August 18, 2010 at 1:11 pm

      Aaron, sorry for a late response!

      The primary reason is the shape and direction of light – when you use a large aperture, the light spreads from the aperture all over the place, hitting dust particles on the sensor filter from different angles. When you use a small aperture, the light is perpendicular to the sensor and the dust spec is hit from a much narrower angle, which then exposes dust particles more by casting hard shadows vs soft.

      Hope this makes sense :)

      Reply
      • Jose Soto
        March 3, 2016 at 10:04 pm

        Cold you tell me if the dot on the attached photo is Dust, stain or what do you think it is?Please tell me where i can send the photo to. IT IS A VER Y INTERESTING DOT ON THE PHOTO.

        Reply
  4. Vivek
    August 7, 2010 at 2:13 am

    excellent.. need to check out mine today itself!

    Reply
  5. Mymy
    August 13, 2010 at 12:49 pm

    Nice article.Waiting for your “how to clean camera lenses”, i will defiinitely stay tune….

    Reply
    • Nasim Mansurov
      August 18, 2010 at 1:13 pm

      Mymy, sorry, but I have not had time to write the article yet. It is still in my “to-do” list.

      Reply
  6. Vivek
    October 10, 2010 at 10:25 pm

    Hi Nasim,

    I have got fungi on my 18-55 nikon kit lens.. Is ther any way I can clean it by myself ? Think its on the outer side of the lens.

    Thanks,
    VIvek.

    Reply
    • Nasim Mansurov
      October 22, 2010 at 1:17 am

      Vivek, when you say that it is on the outer side of the lens, can you be more specific? Is it just on the front element or can you actually see it inside? If it is the latter, then you will need to send your lens to Nikon for repair.

      Reply
  7. Nikhil
    March 28, 2011 at 7:39 pm

    Hi,

    I got a Nikon D7K. When I photographed blue sky, i noticed one darker patch on it. I have done the test detailed here and found that a dark spot is there on the top left corner. But what I am confused is that, the same dark spot is visible on both LIVE VIEW and VIEW FINDER. So I changed the lens and verified, but still the dark spot is there. I checked my lens and they are clean and spotless. Can you please help me out to figure whether it is a sensor dust or some other problem

    Thanks
    Nikhil

    Reply
    • Rahul
      April 25, 2011 at 11:36 am

      hi,

      If the spot remains in both the viewfinder and in live view, it is most like the lens. The spot could be somewhere other than the front element. Have you tried zooming at different focal lengths , the optics might dilute the anomaly at different positions of the lens elements.
      Try another lens if you can, as well.

      Reply
      • Nikhil
        April 25, 2011 at 7:52 pm

        Hi Rahul,

        Thank you for your reply. I tried with different lens also. But the spot was still there. So i took it to the service center and the told me that it was sensor dust. I was surprised because, it was only a month I bought the camera and also I rarely change lens during any travel. They cleaned it in 5 mins and now everything is fine :)

        Thanks
        Nikhil

        Reply
        • Rahul
          April 26, 2011 at 8:40 am

          That’s good, but it doesn’t explain why the spot was visible in the viewfinder as well.

          Reply
          • Nikhil
            April 26, 2011 at 9:37 am

            I am currently in Shanghai and bought the camera from here. I gave it to the service center here. I asked them whether it was a sensor dust or something else. The service engineer there speaks only little English and he did not understand my question properly. After making certain desperate attempts in making him understand my question , I retired :) Anyway service was good and fine, and it was a 5 mins job.

            Reply
        • Rakshnna
          January 5, 2013 at 10:50 am

          did it cost you anything? Because I just inquired and they told me it would cost me 800 and odd :P They said they might want to replace it! Scary!

          Reply
      • mo
        June 4, 2013 at 5:17 pm

        Hi! First of all thank you very much for these quite understable explanations. I was suspicious about dust on my camera sensor because of some white spots on some phtos, so I followed the rules and did the test with the withe paper twice, one for each lens. I found 14 (fourteen!!) dust spots and also fine shades here and there.
        I also noticed a little spot when I look through the viewfinder, that spot is not on any lens because I looked through it without the lens and the small spot is there near a focal point mark. I bought my camera for about 5 months and I am very careful with it, also when changing lenses which I don’t do too often. What do you suggest, I mean, what is your advice? I’m a bit afraid of touching the sensor as well I don’t think I can afford take it to a technician. Thank you very much!

        Reply
  8. veronica
    August 30, 2011 at 8:43 am

    I have a question.
    I’m thinking of buying a used lens. It says that there’s quite a bit of dust in the second element. What it that mean? Does it affect the quality of the photo? I have been looking all over the internet and I can’t find anything about it! Unless there’s a different name for it! Also, would a used lens affect my new camera body? I had always used new lens, so maybe it’s a silly question but the dust ( which I don’t know where actually is) could affect my camera?
    Thanks for your help! I found your posts very very helpful!

    Reply
  9. Eduardo
    November 4, 2011 at 6:25 am

    Hi Nasim, I wonder if you could help me. I can see a little spot of dust through the viewfinder of my D5000. I believed it was in the lens but I changed it and nothing changed. It is not in the sensor since it is not seen on my pictures. Is it on the mirror sistem? I tried to blow some air using an AA1910 Giotto’s rocket air blower but the dust spot remains there. What can I do to remove it? Despite not spoiling my pictures it is bothering me.

    Reply
    • Nasim Mansurov
      November 13, 2011 at 11:39 pm

      Eduardo, the dust is either on the mirror, or right above the mirror on glass surface. Try to use your blower on both and hopefully it will be removed.

      Reply
  10. Peter Creta
    March 15, 2012 at 6:05 pm

    hi nasim,
    a week ago i bought the point and shoot nikon s9100 with 18x zoom. i found a rear element dust on my photos when i zoom. the lens is not removable to clean it by myself . do you think that a technical could open it and clean it?

    Reply
  11. PRADEEP SWAIN
    August 16, 2012 at 6:39 am

    Dear sir, I have been following different authors from different parts of the globe, who are really really very much talented in Photography profession. But when it comes to you I can say that if anything top award like Novel prize is there in photography, it will go to you. You are the perfect person and I salute your knowledge.

    The most humble part is your attitude to share your knowledge. I think no other author shares this much of knowledge and experience you are sharing.

    I am from India. Last year I purchased a used Nikon D70s camera. But I didn’t know the use of camera. But learning from your blog I am learning lots of things. The simple English language is helping a lot to
    understand your articles. I hope one day I will be able to capture a good photo which will truly satisfy me.

    You are an encyclopedia of photography.
    Thanks and regards,
    PRADEEP SWAIN.
    VIM-278, Sailashree Vihar, Bhubaneswar,
    State- Odisha, Pin Code- 751021
    Country- India

    Reply
  12. Mike P
    September 14, 2012 at 3:11 pm

    I just tried to clean my D40 with this method and unfortunately, there are still significant dust particles after 4 attempts. I am nervous to do my D700, but I do see a lot of dust on its sensor as well (using the testing method). I may just leave it there!

    Reply
  13. BOHDAN MAZHAR
    November 9, 2012 at 2:30 pm

    Молодец, спасибо. Мы с женой многому у тебя научились.

    Reply
  14. shiva
    November 30, 2012 at 11:32 pm

    While checking your test photo in a computer screen,. please clean and double check the dust in your computer moniter screen. you may be fooled by the dust which is already there in your computer screen..

    Reply
  15. Santhosh
    December 15, 2012 at 7:59 am

    Oh my god! I am seeing so many spots on my sensor.. In the first attempt, I didnt believe there could be so many. But when 2nd and 3rd attempts on different white surfaces also showed same spots at same places, I had to believe it.. :( Thanks for opening my eyes!

    Reply
  16. Rakshnna
    January 5, 2013 at 10:47 am

    This is exactly what has happened in my case. Thanks for the help. I would like to know where your next article is. The one where you said you will be illustrating about cleaning the sensor, mirror etc.
    Please reply.

    Reply
  17. Carlo
    January 21, 2013 at 4:18 am

    Wow! I learned so much from your website.
    I got a nikon d3200 last december 2012 and after using it in a dusty environment I found my sensor full of dust. I bought an Eclipse sensor swab and cleaner, sad to say its the only cleaner here in the Philippines.
    I cleaned it the way you taught in your video. And my sensor’s already clean.
    I just want to know how do I know that my sensor was damaged by using the Eclipse cleaner?
    Thank you very much!

    Reply
  18. ens
    February 9, 2013 at 10:16 am

    what about the mirror(the part where the light hit 1st) and the focusing screen? :\
    i noticed some bluish-marks at certain angle on the mirror…

    Reply
  19. Dwayne
    February 25, 2013 at 10:02 am

    Thanks! I can see just how dirty my sensor is. Great website for educating photographers of all walks.

    Reply
  20. Samuel Jeffery
    March 11, 2013 at 11:38 pm

    This is a wonderful article. I’m dealing with heavy dust issues on my sensor (and self-cleaning has appeared to make it worse) that need to be taken care of.

    Reply
  21. mo
    June 4, 2013 at 5:19 pm

    Hi! First of all thank you very much for these quite understable explanations. I was suspicious about dust on my camera sensor because of some white spots on some phtos, so I followed the rules and did the test with the withe paper twice, one for each lens. I found 14 (fourteen!!) dust spots and also fine shades here and there.
    I also noticed a little spot when I look through the viewfinder, that spot is not on any lens because I looked through it without the lens and the small spot is there near a focal point mark. I bought my camera for about 5 months and I am very careful with it, also when changing lenses which I don’t do too often. What do you suggest, I mean, what is your advice? I’m a bit afraid of touching the sensor as well I don’t think I can afford take it to a technician. Thank you very much!
    Canon 1100D

    Reply
  22. Guy Geva
    December 2, 2013 at 10:11 am

    Hi (:

    Is “Dust off reference” effect the resolution of the shot?

    I’m shots landscape and macro, And sadly I’m using the Nikon D600 that have dust on the sensor every 300-500 shots

    I hope you can help me please about the resolution question?

    Have a great day (:

    Reply
  23. krishnakumar nair
    December 4, 2013 at 11:30 pm

    very nice article. found it extremely useful. I clicked pictures of my laptop screen after opening NOTEPAD, opened the pictures in PICASA, clicked on I AM LUCKY for better contrast. It is better to click two pictures and toggle between the two. The dust on the sensor looks sharp and is stationary. Also click at higher apertures( like f8,f3.5,f1.8) and observe that the spots just blur and fade away, hence, we do not observe these at the apertures that we normally shoot at.

    Reply
    • Guy
      December 5, 2013 at 2:41 pm

      But most of the time (in landscape) I’m using f/22…

      Reply
  24. Pol
    January 17, 2014 at 12:20 am

    This article was so useful, thank you ever so much! I had a spot of dust on the rear element of my telephoto lens, and in 2 seconds using google I found your image explaining what was causing the problem with my image. I will certainly bookmark it for future use.

    Reply
  25. Rohit
    February 9, 2014 at 8:58 pm

    HI , have got a problem in my camera when ever i click a photograph there is a line coming on top of my pic every time plz help

    Reply
  26. Munaf
    August 28, 2014 at 11:05 pm

    Great article Nassim.

    I think I can spot 3 specks of dust that match those for sensors using your method (I used a white wall lit by a slightly yellowish light). 2 are faint and blurry, rather like those in your example. 1 is much darker, and more distinct, does this mean that it is a darker spot of dust? I’m hoping it’s not any damage.

    Looking forward to your cleaning article, thanks!

    Reply
  27. Jeremy Holt
    January 15, 2015 at 2:31 am

    Hi Nasim, thanks for the post. I have been wondering what is wrong with my pictures. I have an M8 which I bought a few months ago and then suddenly I started seeing spots in the pictures. Trouble is it wasn’t in all pictures and not all lenses. Reading this article it looks to be on the sensor, so I’ll check out your cleaning articles… cheers!

    Reply
  28. Jana82
    March 31, 2015 at 9:49 am

    I just purchased the Nikon D7200, and there’s about four or five ugly dust spots in the sky of all of my beach images. Mainly at smaller apertures, f/8 and up on my 35mm 1.8 prime. I’ve only taken about 400 photos, will this only get worse? Should I return it? :(

    Reply
  29. Marie-Claire white
    April 7, 2015 at 10:06 pm

    Thank you for your very informative page.
    I have just started getting these brown spots on my photos (Nikon D200) that come up in the same spot in every picture. I can’t figure out whats wrong with it. Any advise would be great. Thank you in advance

    Reply
  30. Al
    May 21, 2015 at 6:38 pm

    Hi Nasim, thanks you for this information. I would like to ask you about my cause… I just bought a new brand Nikon D750 and for the first 2 weeks the camera was working perfect. Yesterday I was looking the pictures and I found 2 big white spots in my pictures and 2 small circles when aperture values are more than F 10. The problem still when I change lenses and there is no dust in the mirror.
    I was trying to find information about this but seems like always when sensor is dirty, you have black dots and not white. This looks like dead pixel, but is too big to be. I already contact Nikon customer Service, but I would like to share with you this information perhaps you could help me to know what is this. I am attaching a picture, and please feel free to contact me if you need more information about.
    Thanks
    Al

    Reply
    • Al
      May 21, 2015 at 6:49 pm

      zoom…

      Reply
    • Al
      May 21, 2015 at 6:53 pm

      Another example… everyone with F more than 10.. this one is with F22

      Reply
  31. pia
    June 10, 2015 at 1:41 am

    awsome information :) keep sharing…

    Reply
  32. Leoni Buchanan
    February 17, 2016 at 9:56 am

    Hi there, just want to say thank you ever so much for posting this article as I’ve just recently purchased my first DLSR camera and freaked when I saw little bits of dust through my viewfinder! Luckily it was only dust particles on the mirror and managed to gently brush them away but if it weren’t for you I’d probably have gone to get it fixed and probably have been charged and unseen amount of money because of my lack of knowledge. What a great help :)

    Reply
  33. Sai Kelly
    February 23, 2016 at 5:44 pm

    Did you ever write the article on the sensor cleaning?

    Reply
  34. Dale
    April 5, 2016 at 5:59 pm

    Hello Sir! thank you for this post. I’m a very “beginner level”, hobbyist and I find your posts very helpful and amateur friendly. I’m mean I could understand it easier than other sites.

    This sensor dust is my case now. I bought my Nikon D610 second hand in Japan but I didn’t notice the dust at first since I usually work within f1.8-f3.5 range. But when I came back to the Philippines and did some landscapes, it became more evident.

    still looking for a reliable service center here in Manila.

    thanks again!

    Reply
  35. Pioter
    April 15, 2016 at 12:46 pm

    Thanks :-)
    Very useful!

    Reply
  36. Kandu
    August 7, 2016 at 2:32 am

    Thank you for great information

    Reply
  37. David Dube
    November 27, 2016 at 2:03 pm

    Oops, looks like the Beaver hut is gone at Maroon Bells.

    Reply
  38. PSchneider
    June 1, 2017 at 2:32 pm

    GREAT article with helpful examples.

    Reply
  39. Nibiru Planet X World News
    June 23, 2017 at 11:24 am

    Hi there is it possible i can have permission to use these images to make a video on youtube ?

    Reply
  40. GeeDee
    September 26, 2017 at 1:54 pm

    I am getting a particular part as distorted. does this need repair or I can fix it at my own?

    Reply
  41. Ed
    October 3, 2017 at 6:22 am

    Hi
    I have an iPhone 5 that had a broken screen which allowed dust to get inside. And this caused the front camera to become foggy. So I replaced the screen which includes a new selfie camera but then noticed a dust speck on the main camera images that enlarges with zoom. I tried to clean the lens with an air can and it seems to me that I’ve made it slightly bigger. After reading your article I pointed the camera right next to a white wall, out of focus, and the speck is still there in focus. I’m pretty sure that this dust was not there before my interventions. I could replace the camera (only 12€) but it’s a 1 hour job by disassembling just about the entire phone. If I blew dust onto the sensor can I remove it by blowing more air ?

    Reply
  42. Dimitrios Tsagdis
    January 31, 2018 at 10:13 am

    Tnx for you useful advice and demonstrating the gel lens cleaner. I tried what you suggested to take a test shot of my sensor at f/36 in both my bodies using different lenses. My Canon 7DMII (which I had for a couple of years doesn’t have a single spot) which made me proud but I do not use it very often and usually stays with one lens attached (the 100-400 II) most of the time and my 6D which I had for 4 years and when I use I change lenses all the time only had a couple of tiny spots which I’m also very happy about (I thought it would be far worst) and under normal shooting I never noticed them. When I visually inspect my 6D sensor, even with a magnifying glass and a head lamp I cannot identify these two tiny spots on my sensor. My question when I look at the photo with the spots at the LCD back of my camera the spots appear to be on the left hand side towards the edge and half way through in terms of height. When I visually inspect my sensor at the front should I expect to find these spots at the same coordinates or is the sensor their reverse or upside down or something along these lines. So for example what I see in the picture at the back as left when I look at the sensor at the front is right or left? Ditto for up down.

    Reply
  43. Marek
    February 20, 2018 at 1:46 pm

    When the dust spec is in the top right corner on the photo, which corner of the matrix is that when looking straight at it?
    Just want to know where to focus my little blower.

    Reply
  44. BachoGap
    July 27, 2018 at 3:55 pm

    I made a choice on used Canon 6D and going to test it carefully. After short researches I found your articles and will be very useful. Thanks and I’ll be following !

    Reply
  45. RossRoberts
    November 14, 2018 at 12:51 pm

    Thankyou for the very helpful tutorial!! I was frustrated, but this helped me identify and clean dust off my camera’s imager.

    Thanks a TON!!

    Reply

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