My last crop factor question.

[Gene Sung]

From all the posts I've read on here (very educational), I understand that Crop factor is mainly an issue for Still photography, and that it has less or no importance with video on the 7D. Is that correct? I do understand that the 7D has the closest Crop to 35mm motion picture cameras (e.g. Panavision, Arri, etc..), so that's a start for me. LOL.

With that said, I have a few questions (mainly regarding Video).

1) When shooting VIDEO using a 50mm lens of a man 10 feet away on a 5D, a 7D (1.6 crop), or a GH1 (2.0 crop); the 3 different cameras have a DIFFERNT field of view of the subject 10 feet away. i.e. the man will be composed differently in all 3 cameras when shooting video because of the crop factor?

Or will the field of view in all 3 cameras be the SAME when composing the man in Video? And only change when shooting Stills?

2) EF-S lens is developed for the APS-C senor with the 1.6 Crop factor in mind. With that said, what effect does it have on VIDEO? When shooting video on say a 50mm EF-S lens versus a 50mm EF lens (non-S), do we get the same field of view when shooting video?

And once again, the crop factor only comes into play when taking Stills?

Thanks for all the help.

 

[Buck Forester]

1) The field of view will be different between the 7D, 5D, and GH1 using the same lens at the same distance, correct.

2) EF-S lenses are made specifically for the APS-C sensor and it has no difference with video in stills regarding focal lengths. These are just the lenses so whether you're shooting stills or video there's no difference in the physics of the mm distance. A 50mm EF-S lens on a 7D will have the same field of view as a 50mm EF lens on the same 7D. Both will have the same field of view as an 80mm lens on a standard 35mm full-frame still camera. That's why you see EF-S lenses going very wide, like the Canon EF-S 10mm-22mm, which really is the equivalent of a 16-35.

Since EF-S lenses can't be used on standard full-frame cameras like the 5D, but you can still use standard EF lenses on the APS-C cameras, I wouldn't invest too much in EF-S lenses unless you plan on sticking with those cameras long-term (just my opinion).

 

[Jurno]

EF-S lenses create a smaller circle of light than EF lenses. The EF-S circle of light fits the cropped 7D sensor, but a 5D mkII sensor is bigger than the circle, so you get vignetting (dark edges and corners).