Which sensor "full frame" vs. APS-C (1.6 crop) gives more distortion using the same lens? I mean, would a 10mm lens on a full frame camera show more or less distortion than if it were on an APS-C (1.6 crop factor) sensor camera?
You see, I have a Canon T3i (APS-C) and would like to time lapse the milkyway with out a lot of barrel or linear distortion. I've been looking to get the Rokinon 14mm lens but found that it only has 81.2° of angle (FOV). I'd like a wider lens with a larger angle (FOV) to accept as much of the milkyway in the FOV for as long as possible, but without too much distortion.
Answer
The full frame camera will generally give more distortion than a crop body camera with the same wide angle lens because the wider angle of view obtained with a FF camera includes the edges that are cropped when using the same lens with an APS-C camera. Cropping the FF camera's image to get the same Field of View (FoV) as the APS-C camera will yield the same amount of distortion with the same lens. The Rokinon (Samyang/Bower/etc.) you asked about has a 114º diagonal FoV when used in a FF camera, compared to about 71º on an Canon APS-C camera. That lens has an unusual distortion pattern with a pronounced bulge just inside the area used by an APS-C camera.
Since distortion is a characteristic of each individual lens design, it is hard to say whether a 10mm lens on an APS-C camera will give more or less distortion than a 14-16mm lens on a FF camera. In this comparison between the EF-S 10-18mm f/4.5-5.6 and the Samyang (Rokinon/Bower/etc.) 14mm f/2.8 the 10mm on APS-C demonstrates considerably less distortion than the 14mm on a FF camera. Of course you sacrifice between one and two stops of aperture as well. The Canon EF 14mm f/2.8, on the other hand, has less distortion at 14mm on a FF body than the EF-S 10-18mm f/4.5-5.6 and the EF-S 10-22mm f/3.4-4.5 do at 10mm on an APS-C body.
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