Interview with Norman Koren of Imatest

A couple of weeks ago I had an opportunity to visit Norman Koren, founder of Imatest, LLC. I have been fascinated by his software for a while now and after evaluating the software, decided to purchase it to use in our lens reviews. When I found out that his company is right here in Boulder, Colorado (where I lived for over 5 years), I gave him a call and asked if I could come over and interview him. Despite his busy and hectic schedule, he was able to accommodate me for an hour during his lunch time. Below is the text version of the interview.

Nasim: Thank you for giving us the opportunity to visit your office and learn more about you and your company. Let’s get started with your background, your company and how it all started.

Norman: You are most welcome Nasim. I grew up in Rochester, NY, about a mile from the George Eastman House, which I visited frequently. Both the technical and artistic exhibits made a deep impression on me—it was there that I first saw the beautiful prints of Ansel Adams and Edward Weston. I had a long career in magnetic recording technology, where my job involved simulating the performance of read, write, signal processing and detection in disk and tape drives. It started back in 1967 at Honeywell in Boston. I then worked for a number of companies including, curiously enough, Kodak in San Diego. Kodak at the time— we are talking 1985— believed that very small tape drives would be used in digital cameras. Well, it didn’t turn out to be a winning technology, but I had an interesting 12 years there. At the same time, I’ve always been a passionate photographer.

Norman Koren

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Amazing Nikon, Canon and Sigma Deals

Folks at B&H notified me that Nikon, Canon and Sigma are running some amazing deals that will expire in September for DSLRs, Lenses and Speedlights. Nikon is currently offering bundled deals with up to $450 in savings. Canon is running various instant rebate programs for lenses and speedlights and also doing camera + lens bundles for additional savings. And Sigma is also running an instant rebate program for their lenses and speedlights. Below are the links for these deals:

Nikon Buy Together and Save (Expires August 25, 2012):

Nikon Bundled Savings

Canon Lens and Speedlite Rebates (Expires September 1, 2012):
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The Importance of Having a “Good” Lens

After testing a set of brand new 28mm lenses for my Nikon 28mm f/1.8G Review a couple of weeks ago, I was rather disappointed by the overall performance of the lens. Both samples that I tested exhibited visible focus shift and field curvature issues, which impacted performance in a “wavy” pattern. This weekend, I decided to give another Nikon 28mm f/1.8G a try and see if it has the same optical issues (borrowed from our team member Bob Vishneski).

To my surprise, the third lens sample performed much better in comparison to the first two. Here is the original chart that I published in my review:

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Nikon DSLR Firmware Recommendations

When Nikon releases a new generation DSLR camera, it seems to often make little changes to the camera firmware. We typically see slight tweaks here and there, but every once in a while (especially when a new piece of technology makes it into the camera) we see some new interesting and useful features getting added into the camera firmware. In this article, I would like to point out current firmware issues that I believe Nikon needs to address, along with some recommendations (wishlist) on what Nikon should do in their future cameras. Or, perhaps Nikon might consider to implement some of the below firmware fixes/recommendations on current DSLRs – I am sure many of the Nikon owners would get excited about some of these requests.

Nikon DSLR Firmware Recommendations

1) Add DNG Support

As a Nikon shooter, you already know how painful it can be to constantly keep updating post-processing software, image codecs and photo viewing programs every time Nikon releases a new camera. Upgrading a camera should be easy and we as consumers should not have to go through this process every time. DNG has already become a universal format and companies like Hasselblad, Leica, Pentax and Samsung have already adopted it. Why not do the same? I am not asking Nikon to abandon its NEF file format. Just give us a choice to pick either NEF or DNG please!

2) Allow AF Fine Tune Calibration of Each Focus Point

Thanks to the recent Nikon D800 Asymmetric Focus fiasco, we now know that each autofocus point is calibrated at the factory during the QA process. We also know that Nikon keeps the ability to tune these AF focus points to their own calibration software. Why not add this capability to every advanced Nikon DSLR where AF fine tune is already provided? Sure, this seems like a headache to implement and could result in a some improperly calibrated cameras out there (due to user error). But for those of us who know what they are doing when it comes to lens and camera calibration, why not give this capability? Nikon would save a lot of money on not having to re-calibrate so many cameras. Adding this feature, of course, would not be an excuse for improperly calibrating cameras, but it would certainly make the AF Fine Tune feature way more useful.

3) Allow AF Fine Tune Calibration for Different Focal Lengths

Those of us that have attempted to calibrate zoom lenses know that one AF Fine Tune value is often not good enough for the whole zoom range. The AF Fine Tune feature would be a lot more useful if we had the ability to use different AF Fine Tune settings depending on the focal length of the lens.

4) Live View at 100% Pixel Level Should be Standard

Nikon’s implementation of Live View on the Nikon D90 was terrible, due to its interpolated output. Since then, Nikon has made many new cameras that had a 100% pixel view, which was very useful in obtaining precise focus on subjects. With the D800, Nikon brought an interpolated live view back (which is one of my biggest complaints on the D800). Nikon should fix this as soon as possible on the D800 and make 100% pixel level live view a standard on all future cameras.

5) Fix Custom Settings Banks

The Custom Settings Banks implementation on Nikon DSLRs is bad and completely impractical. I personally do not bother using them on any of my cameras, because I do not have the time to either switch them in multiple places (Shooting Bank and Custom Settings Bank), or constantly review the settings to make sure that they have not changed. First of all, memory banks should apply to all camera menu items. Second, these settings need to be “lockable”, meaning if anything gets changed, the setting should not get overwritten unless I want it to.

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Nikon 50mm f/1.8G vs f/1.4G

Ever since I published my Nikon 50mm f/1.8G review, where I showed that the lens outperforms pretty much any other Nikon 50mm lens, including the more expensive Nikon 50mm f/1.4G, I have been getting a lot of questions from our readers. Some wonder if perhaps I made errors in my assessment of the lens – it seems hard to believe that a cheaper lens would outperform its bigger brother. Others wonder if the 50mm f/1.8G truly is that good, why Lola and I continue to use the 50mm f/1.4G lens for our work (it is also listed in the outdated “Our Gear” page).

Nikon AF-S 50mm f/1.8G

After many years of dedicated service, the Nikon 50mm f/1.4G finally went kaput on us (it has all kinds of focus issues, probably as a result of field abuse, so it is on its way to Nikon for repair). I had no intention of selling the older 50mm f/1.4G, because it shows a lot of wear and tear and I knew I wouldn’t get much for it anyway. Since Lola cannot live without her favorite 50mm lens, as soon as this one died, I knew that I would be getting the 50mm f/1.8G version.

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Mansurovs Workshop Schedule for 2012

Many of our readers have been asking about our photography workshop schedule for this year. While I initially planned for the summer, due to the increased interest from local photographers (many of whom are pros), we decided to postpone the workshops till the end of the summer. The summer schedule is pretty hectic for most photographers, including us, due to weddings and other photo shoots, so we decided that it would be best to conduct workshops in early September instead. Below you will find the more or less finalized schedule for our upcoming photography workshops.

1) Workshops and Dates

So far we have decided to conduct two workshops on two different topics:

  1. September 8, 2012 – Flash Photography Workshop
  2. September 9, 2012 – Post-Processing Workshop
  3. September 22, 2012 – Landscape Photography Workshop (FULL)

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Please welcome our newest team member!

Please welcome John Bosley, our newest team member at The Mansurovs. We are proud to have John in our team, not only because he is a very talented professional photographer and educator, but he is also a totally awesome and down to earth guy that happens to be a very dear friend of ours.

John Bosley

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Nikon D800 / D800E Asymmetric Focus Issue

There has been quite a bit of buzz around the Nikon D800 / D800E focusing issues and one of the most recurring topics of discussions seems to be around the asymmetric focus issue (left AF focus issue). As I have already explained in my “how phase detection autofocus works” article, any DSLR is prone to having AF issues, simply because of the way the phase detect sensor works.

Nikon D800

Folks that have been shooting with DSLRs for years and have gone through different camera bodies know very well that every camera announced to date had a small number of defective units out there. Some had rare issues that required service or replacement, others had defective components (such as battery) that had to be recalled and some units were plagued with autofocus calibration issues. In the big picture, however, the number of truly affected units was very small. The Nikon D7000 DSLR, for example, received some negative feedback specifically on its autofocus problems. After doing some extensive research and gathering lots of data from our readers, it turned out to be that most problems I looked at were user-related issues and very few units actually had manufacturing defects, as I have previously shown in my Nikon D7000 Review Follow-Up. Negative feedback is always more popular and when someone complains about a rather serious problem, it quickly gets blown up. Most people don’t even bother providing positive feedback anyway, so all the bad stuff gets surfaced rather quickly. Also, when looking through customer feedback before buying a product, have you noticed that you typically tend to look for negative feedback more than positive? There is a simple explanation for this type of behavior – people would rather read about product issues to understand limitations and potential problems, than only look at rave reviews.

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Are you ready to be “Packed”?

A friend of mine sent me a video from the WSJ called “Don’t Forget to Pack a Photographer” (link to the video, link to the article). Seems like there is a new trend in higher-end markets, where people are hiring professional photographers to photograph their vacations. It is certainly an interesting concept that could create potentially good business for us photographers (if priced right and done right).

Pack a Photographer (Photo by Helene Havard)

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How Phase Detection Autofocus Works

When it comes to DSLR technology, there seems to be quite a bit of confusion on how exactly phase detection autofocus works. While for most people this might not be a topic of great interest, if you are wondering how and why a camera could have an autofocus problem, this article will shed some light into what happens inside the camera in terms of autofocus when a picture is taken. There is an overwhelming amount of negative feedback on autofocus issues on such fine tools as the Canon 5D Mark III, Nikon D800, Pentax K-5 and other digital SLR cameras and it seems like most photographers do not seem to understand that the underlying problem is not necessarily with a specific model or type of a camera, but rather with the specific way these cameras acquire focus. If you search on the Internet, you will find thousands of autofocus reports on all kinds of DSLRs dating back 10+ years. Hence, the front focus and back focus issues we see in modern cameras are not anything new – they have been there ever since the first DSLR with a phase detect sensor was created.

How DSLR Cameras Work

To understand this issue in more detail, it is important to get to know how a DSLR camera works first. The typical DSLR illustrations only show a single reflex mirror positioned at a 45 degree angle. What they don’t show, is that there is a secondary mirror behind the reflex mirror that reflects a portion of light into a phase detect sensor. Take a look at the below simplified illustration that I made from a sample Nikon D800 image:

How Phase Detection Autofocus Works

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