ethranet Posted November 12, 2009 Share #1 Posted November 12, 2009 Advertisement (gone after registration) Is it only disabled when lens detection is set to off? When lens detection is set to off and a six-bit lens is put on the camera does it still show up in the metadata? Link to post Share on other sites More sharing options...
Advertisement Posted November 12, 2009 Posted November 12, 2009 Hi ethranet, Take a look here Disabling vignetting correction on the M9?. I'm sure you'll find what you were looking for!
adan Posted November 12, 2009 Share #2 Posted November 12, 2009 1) yes. 2) no. They are a package deal - you get lens detection, vignetting correction (if applicable to that lens) and EXIF data... or NO lens detection, NO vignetting correction and NO EXIF data. Same for manual lens selection - all or nothing. Link to post Share on other sites More sharing options...
lars_bergquist Posted November 12, 2009 Share #3 Posted November 12, 2009 There are certain corrections that are always applied in all situations, but at a 'minimum level'. This is known at least for the colour shift correction that the over-sensor IR filter makes necessary. This correction is adjusted to fit the coded lens specifically. I would think that there is also a minimum correction in place for common luminance vignetting, and adjusted for specific coded lenses. Without the coding, you do see vignetting especially with wide angles, but this seems to be very much less that there would be without any correction at all. The level of 'base' correction is limited by the effect on longer lenses of course. You do not want to see obvious 'reverse vignetting' in images from 90mm lenses, for instance. Some reviewers have nevertheless observed small tendencies in that direction, as I remember. The old man from the Age of the Box Camera Link to post Share on other sites More sharing options...
cliffp Posted November 12, 2009 Share #4 Posted November 12, 2009 If you switch off lens detection and don't bother to manually select the lens, can you apply the vignetting correction during postprocessing? I am guessing that Leica could create an application that did this and this might make life easier for people with old lenses (assuming they remembered which lens was in use for which shot). Link to post Share on other sites More sharing options...
thrice Posted November 12, 2009 Share #5 Posted November 12, 2009 If you switch off lens detection and don't bother to manually select the lens, can you apply the vignetting correction during postprocessing? I am guessing that Leica could create an application that did this and this might make life easier for people with old lenses (assuming they remembered which lens was in use for which shot). This is what cornerfix does. Link to post Share on other sites More sharing options...
cliffp Posted November 12, 2009 Share #6 Posted November 12, 2009 @Daniel Thanks. I had a look at your gallery and your photos are AWESOME! Link to post Share on other sites More sharing options...
ethranet Posted November 12, 2009 Author Share #7 Posted November 12, 2009 Advertisement (gone after registration) So for people who are using cornerfix, which is probably what I would do - does it allow you to select manually which lens you were using when you don't have the metadata? I'd rather the camera not bake a vignetting correction into my raw file if I can help it. Link to post Share on other sites More sharing options...
ho_co Posted November 13, 2009 Share #8 Posted November 13, 2009 ethranet-- Check instructions for CornerFix at CornerFix | Get CornerFix at SourceForge.net. For any lens you use, you first make a template; and then CornerFix lets you apply that template to any file you want. That is, CF doesn't care what lens you used, but accepts your template as saying, "Apply this correction, please." CornerFix works very well, but I use it only when the camera/lens combo requires it. Don't know why you wouldn't want the camera to apply corrections in most cases; that's how it's designed. But it's your choice; just turn off lens ID and go to town! Link to post Share on other sites More sharing options...
ethranet Posted November 13, 2009 Author Share #9 Posted November 13, 2009 The reason I wouldn't want the camera to bake the correction is because of the increased noise in corners due to vignetting correction. I could try to bring the corners back down in Lightroom but the shape might not line up that well. Of course since it will probably be months before it is possible to get an M9 it will be some time until I know if this would actually be an issue for me or not. Link to post Share on other sites More sharing options...
Ario Arioldi Posted November 13, 2009 Share #10 Posted November 13, 2009 By correcting the vignetting the noise in the corners will increase in any case, no matter if you use LR or CornerFix o let the camera do the correction. With CornerFix you may also decide to which extent you want the correction to be made both for the luminance and for the chroma, indipendently, and this may help to find the best compromise between vignetting and noise. Cheers, Ario Link to post Share on other sites More sharing options...
ethranet Posted November 14, 2009 Author Share #11 Posted November 14, 2009 Yeah, that's my plan is to find a balance between excessive noise and too dark corners. I don't plan shooting wider than 28mm so it might not even be an issue for me though. Link to post Share on other sites More sharing options...
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