So a f/1.8 on a 1" sensor would still gather more light than a f/3.5 on an APS-C?

Started 6 months ago | Questions thread
Bill Ferris
Bill Ferris Veteran Member • Posts: 9,327
Re: Back to the original point:

Math is never obsolete.

A 1" sensor has a crop factor (relative to 35mm) of 2.7x. Most APS-C sensors (Canon is the exception) have a crop factor of 1.5x relative to full-frame.

To determine the crop factor of 1" relative to APS-C, divide 2.7 by 1.5. The result is 1.8 so, a 1" sensor has a crop factor relative to APS-C of 1.8x.

If a 1" format camera is being used at some shutter speed and an f-stop of f/1.8, the equivalent f-stop in the APS-C format is (1.8*1.8=3.24) f/3.2. That's 1/3-stop faster than the f/3.5 f-stop mentioned in the top post.

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