Thursday, 14 February 2019

focal length - How does crop factor affect perspective?


I have a question about crop factor and how it affects the perspective.


Suppose you have one Super 35 camera and one APS-C camera. As far as I understand, to photograph the same image on the APS-C camera as on the Super 35 camera, you need to use a wider lens, with the focal length needed being determined by the crop factor. Using a wider lens though, this would affect how the depth is perceived, e.g. background objects appear further away than they do when using a longer lens. Therefore, this would not result in the ‘same’ image. Is that correct?


An alternative would then be to move further away from the subject and use the same focal length. I would assume this would capture the same field of view, but would it have an effect on the perspective? I.e. would objects in the background appear the same size as photographed on a Super 35 camera? How can we ensure an equivalent image is captured, both in terms of field of view and perspective?





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