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Brightness of a full frame lens mounted on aps-c vs mounting an identical native aps-c lens

The full frame sensor will not be brighter under the same exposure conditions (Same light in scene, same focal length and f-number, same exposure time, etc.). It will collect more light, but it will ...
Michael C's user avatar
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Brightness of a full frame lens mounted on aps-c vs mounting an identical native aps-c lens

Every lens vignette, only the central portion of the projected image cast by the lens is pictorially useful. This central portion is called the circle of good definition. For each format size, there ...
Alan Marcus's user avatar
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1 vote
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Brightness of a full frame lens mounted on aps-c vs mounting an identical native aps-c lens

A larger image circle is more light, but that additional light only exists in the areas not recorded by the crop sensor. Essentially, the APS lens is just cropping the image circle before the sensor ...
Steven Kersting's user avatar
4 votes

Brightness of a full frame lens mounted on aps-c vs mounting an identical native aps-c lens

The brightness of the image formed by a lens is the same regardless of the size of the sensor behind it, assuming the image circle fully covers the sensor. An APS-C sensor behind a full frame lens is ...
spunky_h0rn's user avatar

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