Archived posting to the Leica Users Group, 2006/12/27

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Subject: [Leica] IMG: First Gallery M8 B & W
From: reid at mejac.palo-alto.ca.us (Brian Reid)
Date: Wed Dec 27 08:03:57 2006
References: <FA95B766-9D17-43C4-ABCF-7643B3B8048B@mac.com> <A6839AEB-AD24-4B91-A1CA-6AEF2E8177E3@mac.com>

> Hugh - I'm curious about the odd shutter speed indications in the  exif 
> data - any idea?

The EXIF 2.1 standard specifies "exposure time" to be an "unsigned 
rational". That means it is a fraction.

Hugh's picture lists "3331/99931" as the shutter speed. If you divide that 
out, it's 1/30 of a second. Well, almost: 1/30 is 3331/99930.

It's the job of the program displaying EXIF data to reduce a fraction before 
displaying it. Because the camera listed 99931 as a denominator instead of 
99930, the Gallery software didn't reduce it to 1/30 before displaying it.



Replies: Reply from imagist3 at mac.com (Lottermoser George) ([Leica] IMG: First Gallery M8 B & W)
In reply to: Message from hewthompson at mac.com (Hugh Thompson) ([Leica] IMG: First Gallery M8 B & W)
Message from imagist3 at mac.com (Lottermoser George) ([Leica] IMG: First Gallery M8 B & W)