As the gap between the lens and the actual image will increase, the sunshine beams spread out more, forming a bigger real picture. When you attach a really flat lens, it initiatives a big real picture but the movie is simply exposed to the center part of it. Basically, the lens zeroes in on the middle of the body, magnifying a small part of the scene in front of you. A rounder lens produces a smaller actual image, so the movie floor sees a a lot wider space of the scene .
That said, switching to a full-frame camera will …
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