Would Like To Verify Exposure Duration

Started 4 months ago | Questions thread
Bernard Delley Senior Member • Posts: 1,637
Re: Exposure nominal and precise

Iliah Borg wrote:

Bernard Delley wrote:

Iliah Borg wrote:

Bernard Delley wrote:

BTW, apertures (except at fully open aperture) obey N = 2^(p/6) with p an integer.

p/12 and p/24 for Nikon, depending on the body and the lens.

interesting ! please explain.

Current lens control protocol is based on p/24. To set the aperture on a lens, a 1-byte value is to be sent, f-number = 2^(value/24).

interesting, thanks ! So the protocol allows ~3% steps in aperture ratio.

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Nikon AF-S Nikkor 80-400mm f/4.5-5.6G ED VR
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