this post was submitted on 26 Oct 2023
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Photography
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what confuses me is aperture diameter in aps-c 23mm f/1.4 is 16 while 35 in f/1.4 is 25. we all know that the bigger the aperture diameter, the more light comes inside the sensor, the more light, means faster shutter speed.
is this true?
Larger aperture diameter (with the same field of view, as in this case) will collect more light over the same amount of time (and also the depth of field, DOF, will be more shallow). Thus with equal exposure time the larger format will have better image quality (due to more light being collected).
The density of light will be the same though as the light is spread over different areas (FF is 2.3 times larger than APS-C). This is relevant for the exposure calcualtion of the cameras exposure meter. Thus if you use an automatic exposure program, then same f-number on different formats gives you the same exposure time. That's kind of the point of the whole f-number system.