![]() Both images were created exactly the same way, by initially focusing with BackyardEOS' focus module for optimum focus (BYEOS is like having a 2560x1600 live view 's awesome!) The image exposures for both cameras are 1/100s f/8 ISO 200. Seeing (atmospheric turbulence measure) was average.Ībove is a GIF image of the 7D and 5D III images scaled to the same size, overlaid directly on top of each other using Photoshop's layer difference blending mode for best possible alignment. ![]() The lens and camera were attached to an Orion Atlas EQ-G equatorial tracking mount, operating in Lunar tracking mode, to minimize any other factors that might affect image quality. I used a Canon EOS 7D and a Canon EOS 5D Mark III for imaging. I've taken the most reach-limited scenario possible.photographing the moon, with a 1200mm lens (Canon EF 600mm f/4 L II w/ Canon EF 2x TC III). The argument was made that an upsampled 5D III or 1D X image (or even, for that matter, D800/E, D600, etc. In the past, others have made the argument that a camera like the 5D III or 1D X has so much more image quality than a camera like the 7D that the 7D could never compare. The likely case is that you are using your longest lens, and will likely crop in post. A reach limited situation is one in which you cannot get physically closer to your subject, and your subject does not fill the frame. The most significant use case where a camera like the 7D really shows it's edge over full frame cameras is in reach-limited situations. I've long held the opinion that crop sensor cameras, like the 7D, do have value in certain circumstances. Well, I said for a long time that once I got a 5D III, I'd do some comparison shots.
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