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"Aperture value" vs." f-stop" in exif data


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ZoneV Silver Member Nikonian since 08th Jan 2005
Tue 31-May-11 03:13 AM | edited Tue 31-May-11 03:18 AM by ZoneV

Usually, the "aperture value" field is blank in the exif (checking in Photoshop).

But a picture I took the other day has the following info:

F-stop: f/4.5
Aperture value: f/4.4

The photos immediately preceding and immediately following this one have nothing listed under "aperture value". They do have the "f-stop" listed, which is f/4.5. Also, the shutter speed is listed as 1/640th sec for the file in question, but as 10/6400th sec (that's typically how it is listed) for the ones before and after it. Same camera settings except maybe for the focal length, but the lens is a constant aperture zoom (and it is a Nikkor). Why the differences in exif?

And what is the difference between "aperture value" and "f-stop" in the exif anyway?

Nikon user since 2000