Know how wide a scene you want to cover, but not which lens? Enter the angle of view — or the width of the subject and your distance — and your sensor to get the focal length.
Useful for planning panoramas, wildlife from hides and architecture.
How it works
f = sensor width ÷ (2·tan(angle/2)); to frame width W at distance D: f = sensor width × D ÷ W.
FAQ
Why horizontal angle?
It matches how you usually frame landscapes; for vertical framing use the sensor height (24 mm on full frame).
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