Frequently Asked Questions
Why does full-frame appear wider with the same focal length?
Full-frame has a physically larger sensor area. The lens projects the same image circle onto both sensors, but full-frame captures more of that circle, resulting in a wider angle of view.
Does changing focal length change perspective?
No - perspective depends on the distance between camera and subject. Changing focal length changes magnification and FOV but not the relative sizes of near and far objects. Only moving your position changes perspective.
What is a 'normal' focal length?
On full-frame, roughly 43-50 mm matches the diagonal of the sensor and produces an angle of view close to human binocular vision. On APS-C, the equivalent is about 27-35 mm; on Micro Four Thirds, about 20-25 mm.
What does 'equivalent focal length' mean?
It is the focal length on a full-frame sensor that would produce the same field of view. It allows comparing lenses across different sensor sizes using a common reference.
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