jan65 Posted March 22, 2021 Share #1 Posted March 22, 2021 Advertisement (gone after registration) I have an Elmarit 28mm/f2.8 connected via a "Leica M-Adapter L" to my SL2-S. Everything works fine, and the camera also automatically detects the lens. Issue I have is that the camera reads an aperture that is sometimes slightly off the real lens setting. Example with a f4.0 on the lens, the camera is reading f2.8, or f3.4 or f4.0, the value randomly seems to change. So if I take 3 pictures with the same F setting on the lens I get 3 different readings in camera. Question to the forum: any experience with this or explanation why this is or what I can change to correct this? Thanks for the help. Link to post Share on other sites More sharing options...
Advertisement Posted March 22, 2021 Posted March 22, 2021 Hi jan65, Take a look here SL2-S with M-adapter, wrong aperture reading. I'm sure you'll find what you were looking for!
jaapv Posted March 22, 2021 Share #2 Posted March 22, 2021 M lenses have no aperture link to the camera, electronic nor mechanical, thus the camera can only guess the apertrure. Sometimes it guesses right... Nothing you can do, except use pen and paper to record the aperture setting from the ring. 1 Link to post Share on other sites More sharing options...
jan65 Posted March 22, 2021 Author Share #3 Posted March 22, 2021 Ok thanks for the quick reply, I’m new to the system so thought I did something wrong... Link to post Share on other sites More sharing options...
caissa Posted March 30, 2021 Share #4 Posted March 30, 2021 Older cameras (SL) had a sensor to improve the guess. But for some reason (?!) The software was “improved” and the sensor turned off. AFAIK the sensor is still built in and functional, but the software does not use it. Why is Leicas secret ... Link to post Share on other sites More sharing options...
LD_50 Posted March 30, 2021 Share #5 Posted March 30, 2021 2 minutes ago, caissa said: Older cameras (SL) had a sensor to improve the guess. But for some reason (?!) The software was “improved” and the sensor turned off. AFAIK the sensor is still built in and functional, but the software does not use it. Why is Leicas secret ... What makes you think the sensor is no longer used? Link to post Share on other sites More sharing options...
caissa Posted March 30, 2021 Share #6 Posted March 30, 2021 The best guess is not displayed anymore. Link to post Share on other sites More sharing options...
AZach Posted March 30, 2021 Share #7 Posted March 30, 2021 Advertisement (gone after registration) The aperture ”guesstimate” is still recorded and available in the file EXIF but camera does not display it. 1 Link to post Share on other sites More sharing options...
LD_50 Posted March 30, 2021 Share #8 Posted March 30, 2021 14 minutes ago, caissa said: The best guess is not displayed anymore. It just doesn’t show you a fluctuating guess anymore. It still attempts to determine aperture and records it. The aperture is displayed on the lens when you selected it. Link to post Share on other sites More sharing options...
BernardC Posted March 30, 2021 Share #9 Posted March 30, 2021 The aperture "guess" in the EXIF is only there to help with vignetting correction (lenses vignette more at wide apertures). It can be fooled by lens filters, or contrasty lighting, or any number of factors. It is needlessly confusing to users, since it doesn't match the actual setting on the lens (in many cases). Being off by a half stop or full stop doesn't make much difference when correcting vignetting. It's a subtle correction, and you can change it when editing your images. 1 Link to post Share on other sites More sharing options...
beewee Posted March 30, 2021 Share #10 Posted March 30, 2021 Same thing applies to the M10 and later bodies where the estimated aperture is used for vignetting correction but not displayed in camera. Link to post Share on other sites More sharing options...
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