photolandscape Posted November 19, 2007 Share #1 Posted November 19, 2007 Advertisement (gone after registration) I have a 90mm Elmarit, and a 28 Elmarit. Both are coded. When I review the EXIF data for my shots, the lens used is correct, the ISO setting is correct, and so is the shutter speed--but the f/stop is always recorded as 2.8. Is there a way to correct this, and what may be causing it--I'd like to get the correct information recorded in my data. Thanks. Link to post Share on other sites More sharing options...
Advertisement Posted November 19, 2007 Posted November 19, 2007 Hi photolandscape, Take a look here EXIF Data Incorrect. I'm sure you'll find what you were looking for!
sandymc Posted November 19, 2007 Share #2 Posted November 19, 2007 The only aperture data in M8 DNGs EXIF data is the maximum f-stop, which is what I think you're looking at - that would be correct at 2.8 for both those lenses, so what's in the EXIF is not incorrect. Actual aperture is only available as an estimate, and is encoded into the MakerNotes. Right now, there's no publicly available way to read that data. But watch this space..........that should change soon. Sandy Link to post Share on other sites More sharing options...
fjmcsu Posted November 19, 2007 Share #3 Posted November 19, 2007 Steve, The 6 bit coding only codes for maximum aperture; thus your 2.8 f stop reading in the EXIF is working correctly! There is no way at present to read actual f-stop @ time of digital capture Link to post Share on other sites More sharing options...
photolandscape Posted November 19, 2007 Author Share #4 Posted November 19, 2007 OK, thanks. That was kind of what I was wondering. At least I know now that nothing is wrong with the camera. I appreciate the information. Link to post Share on other sites More sharing options...
adan Posted November 19, 2007 Share #5 Posted November 19, 2007 Steve: there was speculation that the light sensor (blue dot) on the front of the camera measures ambient light and the camera can compare that to the actual brightness coming through the lens and make a fair guess as to the aperture used. A guess close enough to adjust the vignetting correction for wide lenses, but (so I understand) only within 1.5 f/stops or so, which Leica decided was too inaccurate to record in the EXIF. People would take two exposures at, say, f/4, and get EXIF data that showed one was taken at f/2.5 and the other at f/4.5, and be sure something was "wrong" with the camera. I played with a beta M8 a year ago, with (I think) 0.9 firmware, and it DID record the shooting aperture as well as the max. aperture (in jpegs, not RAW) even with uncoded lenses - and it was rather variable from shot to shot, as Leica expected. Apparently they deleted the functionality in the production versions. Link to post Share on other sites More sharing options...
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