Author Topic: Optical/camera question  (Read 573 times)

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Offline LoganTopic starter

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Optical/camera question
« on: February 06, 2022, 03:06:21 pm »
Hi.
I want to use a single convex/concave lens between the original lens and the sensor, to compensate a wrong flange-focal-distance in a camera system. I want to know, will this change the effective aperture of the orginal lens(mainly about quantity of passing light, not boken)?
Thanks.
 

Offline BeBuLamar

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Re: Optical/camera question
« Reply #1 on: February 06, 2022, 05:22:32 pm »
Generally you would need a concave lens to have the lens sit further away from the sensor and still can focus to infinity. In the case of the lens that has longer flange distance than the camera just put a tube in between rather than a lens element. Now doing in the first example would make the lens becomes slightly longer in focal length and thus it would have a smaller effective aperture (larger f number) but not buy much as you only extend it a few mm.
 


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