A camera with a crop (APS-C) sensor and the one with a full frame sensor give different results with the same lens. It can sound abstract in theory before you actually see the results. Photographer Ilko Alexandroff created a comparison between APS-C body and a full frame body, using 85mm and 135mm lenses on both. So, from this video, you can see exactly how these lenses perform on a crop and on a full frame body, and how the combination of the camera and the lens affects the photo. It’s interesting to see the changes, and if you are still relatively new to this topic, you will find this very useful.
85mm lens on a full frame vs. crop body
The first comparison Ilko makes is with the 85 mm lens. He places them on a crop body first, the Canon EOS 70D, and then on the 1DX, which has a full frame sensor.
The settings are the same for both shots: aperture is wide open at f/1.8, ISO 100 and shutter speed 1/640. The distance between him and the model was the same as well.
The digital multiplier for Canon is 1.6, so the focal length of the 85mm lens on a crop body is actually 136mm. Here are the results of the photos with these two cameras and the 85mm:
135mm lens on a full frame vs. crop body
The next two camera-lens combinations to test include the 135mm lens on the full-frame and the crop body. Ilko starts off with the Canon EOS 70D. As this lens has f/2.0, he decreases the shutter speed for one-third of the stop to balance the settings with the previous shots. So, it’s f/2.0, ISO 100 and shutter speed 1/500.
With this lens on a crop body, you get about 216mm focal length. Therefore, you would need to stand pretty far from the model. These are the results:
85mm on a crop body vs. 135mm on a full frame body
The last comparison Ilko makes could be the most interesting to you if you are still making a decision between buying a camera with a full frame or a crop sensor. It includes the 70D with the 85mm lens and the 1DX with the 135mm lens. Considering the crop factor, these two lenses give almost the same focal length: 135mm on a full frame body and 136mm on a crop body. The focal length is almost identical, but it’s interesting to see the difference between the bokeh. And here are the results of this comparison:
I’m guessing you already know the difference between the crop and the full frame sensor in theory. But this comparison is a very practical and straightforward way to see and compare the results given by these lenses on different cameras.
So, will you opt for a crop or a full frame camera? Do you think the differences are significant in the third comparison?
[APS-C Crop Sensor vs. Full Frame Sensor DSLR comparison with 85mm & 135mm | Ilko Aleksandroff]