F/stop from outside of lens

Started Oct 29, 2012 | Questions thread
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m712
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F/stop from outside of lens
Oct 29, 2012

For a lens that has an adjustable aperture would it make any difference to the picture quality if the aperture was instead decreased from the outside of the lens for example with a cardboard cut and placed in front of the lens(Assuming the cardboard was cut perfectly circle).

How would the image quality of an F/8 with the cardboard compare to an F/8 with the lense's internal aperture setting.

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