The first image was shot with the Pentax 200mm f/4, and the second image with the Pentax 645 200mm f/4 lens … and they look virtually identical. I met up with Anastasiya in New York, and took a sequence of comparative photos to see the actual results.
CONTAX 645 35MM LENS MANUAL
As mentioned, the way that Sony (and Fuji) implement manual focus, makes these bodies ideal for use with the older lenses. Each of the with the proper lens mount adapter to use on the Sony. I use my Sony A7 to use vintage lenses. I got hold of an old Pentax 200mm f/4 lens, as well as a Pentax 645 200mm f/4 lens. Or does the 200mm lens, which is similar to a 125mm lens, magically turn into a 200mm lens? (125 x 1.6 = 200mm.)Īlready knowing the logical answer, I wanted to confirm it properly with actual photographs to satisfy my curiosity. You may wonder if a 200mm f/4 lens for a 645 camera would magically turn into a 320mm f/4 lens. Or a 0.625 factor, depending on which way you look at it. With that, you can see there is a 1.6x factor involved.
You get the same composition as if you used a 125mm lens. With how easy it is to use older manual focus lenses (of any lens mount) on a Sony mirrorless camera, I thought I would give it a practical try, and see.įor example, if you use a 200mm lens for a 645 camera, the angle of view is similar to that of a 125mm lens on a 35mm camera. I was curious what would happen with a 645 format lens on a 35mm camera, or perhaps a 6×7 format lens on a 35mm camera. It is easier to think about it this way during an actual shoot, since it directly affects our composition. However, in the way we have to change position between the FF and crop camera (with the same lens) to get the same framing of our subject (perhaps a portrait), our focal length effectively changes. Of course, when we use a full-frame lens on a crop sensor camera, the actual focal length doesn’t change. What happens when we put a lens designed for a 645 format camera, on a 35mm camera body. But now what happens when you put a medium-format lens on a 35mm camera? How does the effective focal length change? Specifically, let’s look at 645 vs 35mm focal length lenses. This has been explored in the article: Full-frame vs Crop-sensor comparison : Depth-of-field & perspective. When we now change our composition with the crop-sensor camera to match that of the 35mm camera, we change our own position, we then effectively get thane 1.5x or 1.6x focal length increase. We all know know that when you use a full-frame lens on a crop-sensor camera, that we can consider there to be a new “effective focal length” of the lens on the crop sensor because the field of view changes. Focal length comparison: 645 format vs 35mm format