Nikon D7100 Infrared Conversion

D7100 and 720nm filter (3)

I have a very unique Nikon D7100 – it is likely the first unit converted for infrared use – in the world. My D7100 is also likely the first to undergo two infrared conversions (more on this in a bit). I was fortunate to receive my D7100 from B&H as part of the first wave of product shipments. Apart from a night of putting the DSLR through its paces to ensure that there were no focusing problems or other issues, I didn’t have the D7100 for very long. For the many reasons Nasim outlined in his detailed D7100 review, and being very familiar with its predecessor, the D7000, I liked what I saw of this DSLR’s capabilities.

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What is Field Curvature?

Field Curvature

Field Curvature, also known as “curvature of field” or “Petzval field curvature”, is a common optical problem that causes a flat object to appear sharp only in a certain part(s) of the frame, instead of being uniformly sharp across the frame. This happens due to the curved nature of optical elements, which project the image in a curved manner, rather than flat. And since all digital camera sensors are flat, they cannot capture the entire image in perfect focus, as shown in the below illustration:

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Lens Calibration Explained

Lens Calibration Explained

If you are wondering about how to calibrate lenses, this article has detailed explanations and different methods of AF fine tuning. Due to the nature of the phase detect autofocus system that is present on all SLR cameras, both cameras and lenses must be properly calibrated by manufacturers in order to yield sharp images. Various factors such as manufacturer defects, sample variation, insufficient quality assurance testing/tuning and improper shipping and handling can all negatively impact autofocus precision. A lot of photographers get frustrated after spending thousands of dollars on camera equipment and not being able to get anything in focus. After receiving a number of emails from our readers requesting help on how to calibrate lenses, I decided to write this tutorial on ways to properly fine tune focus on cameras and lenses. Lens calibration is a complex topic for many, so my goal is to make this guide as simple as possible, so that you could manage the process by yourself, while fully understanding the entire process. In addition, I strongly recommend to follow these tips every time you purchase a camera or a lens in order to identify and address any potential focusing issues. But I have to warn you – this article is NOT for beginners. If you just got your first DSLR, you might get very quickly frustrated with the calibration process.

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Mountain Photography Tips

Capitol Peak Sunset

Starting from this month, I am reaching out to the best photographers in Colorado, asking them to write guest posts on our website and showcase their work. There are some amazing masters of photography in Colorado, with various backgrounds in landscape, travel, portrait, fashion and wedding photography. My goal is to not only support our local photography community here, but also to provide valuable information, tips and inspiration from the best in the industry. One of the photography masters is Jack Brauer, who I reached out to about a week ago, after spending a good half an hour enjoying stunning landscape photography on his website. Below is a guest post that Jack was kind enough to write for us, with some very important and useful tips on landscape photography. It turns out that Jack is not only a phenomenal photographer, but also a great educator and story teller. I am sure you will love his article as much as I did. Enjoy!

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How Phase Detection Autofocus Works

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.

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How to Quickly Test Your DSLR for Autofocus Issues

Nikon D800 Focus Test

Below is the easiest and quickest way to test if your DSLR has an autofocus issue, along with a recommendation on what to do if there is a problem. This test can be used to detect front focus or back focus issues with a particular lens or a camera body. I will be using the Nikon D800E as a reference camera for this article, but any modern DSLR with Live View capability can be used for the same test (even entry-level DSLRs such as the Nikon D3200 have a Live View mode). Why would you want to test your camera for autofocus issues? Because if your camera or your lenses are defective or have a calibration problem, then you will not be able to obtain critically sharp images.

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Novoflex Nikon to Canon Lens Adapter Review

Novoflex Nikon to Canon Lens Adapter

This is a review of the Novoflex Nikon to Canon Lens Adapter, also known as “Novoflex EOS/NIK-NT Lens Adapter”. This lens adapter is designed to be used specifically with Nikon G lenses that have no aperture rings. While most generic lens adapters can be easily used with older non-G Nikon lenses and you can easily control aperture by just rotating the aperture ring on the lens, there is no way to control aperture on all modern “G” type lenses with such an adapter. So if you used a generic lens adapter, you would be limited to shooting at minimum aperture of the lens (default) and there would be no physical way to adjust it while the lens is attached to the camera. To allow manual change of aperture on these types of lenses, Novoflex specifically designed an adapter with an aperture lever. In this review, I will talk about the pros and cons of using the Novoflex adapter and my overall experience with it when mounting Nikon lenses on Canon DSLRs.

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Use Nikon Lenses on Canon DSLRs

Nikon 50mm f/1.4 with Novoflex Canon Adapter

While testing some Canon EF lenses on the Canon 5D Mark III, I decided to try to compare the lenses to the latest Nikon lenses and see how they perform side by side. First, my plan was to mount Nikon lenses on the D800 and Canon lenses on the 5D Mark III and look at images at 100% view, but then I realized that it would be tough to do a fair comparison, since the cameras are different. That’s when I thought about using Nikon lenses on a Canon DSLR with an adapter. I knew that it was possible, since some people love mounting the Nikon 14-24mm f/2.8G on Canon cameras. In this article, I will share my thoughts and experience on using Nikon lenses on Canon DSLRs.

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Introduction to Infrared Photography

Final Version

Infrared, or “IR” photography, offers photographers of all abilities and budgets the opportunity to explore a new world – the world of the unseen. Why “unseen”? Because our eyes literally cannot see IR light, as it lies just beyond what is classified as the “visible” spectrum – that which human eyesight can detect. When we take photographs using infrared-equipped film or cameras, we are exposed to the world that can often look very different from that we are accustomed to seeing. Colors, textures, leaves and plants, human skin, and all other manner of objects can reflect IR light in unique and interesting ways, ones that cannot be mimicked with tools such as Photoshop (yes – there are limits to what Photoshop can do!). Like any form of photography or art however, it is a matter of taste. I would strongly urge people to explore the world of IR. As the number of cameras-equipped devices proliferates and the associated technologies improve, IR photography may offer the opportunity for photographers to expand into new arenas and differentiate their offerings from those of others.

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Taekwondo Photography Tips

Taekwondo (1)

I had an opportunity to photograph a local Taekwondo sparring event last weekend and I decided to share some of the photographs from the event, along with some photography tips and lessons learned. I have been involved in Taekwondo since I was 12 and while I spent many years taking part in this beautiful and highly energetic (and sometimes even brutal) sport, I never had a chance to photograph it. While I have been suffering from pneumonia during the last 2 weeks, I could not skip a Taekwondo sparring with some of the best athletes in Colorado. I got my daily doze of antibiotics, then quickly made a plan and took off.

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