Will that elk fill the frame at 100 m with a 400 mm lens? Enter the subject's size and distance, your focal length, pixel pitch and sensor to see its size in pixels and as a share of the frame width.
How it works
Image size = subject size × focal ÷ distance.
FAQ
How many pixels for a good bird photo?
Aim for the bird to span at least 800–1000 px for a detailed crop.
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