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Stopping down to a higher aperture number
Reduces the aperture.
50mm prime lens should work as long as it’s set to the right distance from the sensor.
On a Canon it’s something like 44mm. It’s called back focus and you can look up what that distance is.
I just looked it up, yes it is 44mm.
That means the distance from the back flange of the lens to the surface of the sensor has to be 44mm.
Your adapter needs to be the right thickness so this 44 is achieved.
Greg
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