F- STOP ON OLDER FULL FRAME LENS

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sleepwalker400
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F- STOP ON OLDER FULL FRAME LENS
2 months ago

I have a question on the old FULL FRAME LENS does an F-STOP of say f.3 = F]2.0.?  The reason I ask this is because the diameter  of the lens is bigger in reference to the sensor than the equivalent da lens. CAN ANYONE SHED SOME LIGHT?

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