johnmaloof Posted February 2, 2011 Share #1 Posted February 2, 2011 Advertisement (gone after registration) I have an M8 with a 28mm Elmarit f/2.8 lens. It is not 6-bit coded but, I purchased a (very cheap) kit to code it myself with a Sharpie (seems like they work for others, but... BoPhoto.com: M8 coder - simple manual handcoding of M lenses). I have a UV/IR filter and camera set to "Lens detection - On + UV/IR". I'm still getting vignetting on the edges as shown in the photo linked below. Sometimes it's not too noticeable but, other times it is horrible. Here's a link to Photobucket to a sample of the problem: http://i287.photobucket.com/albums/ll142/johnmaloof/L9990781.jpg Is it the coding that I'm getting wrong? Any help from you guys would be great. Thanks! Link to post Share on other sites More sharing options...
Advertisement Posted February 2, 2011 Posted February 2, 2011 Hi johnmaloof, Take a look here Vignetting w/M8 & 35mm lens. I'm sure you'll find what you were looking for!
Shootist Posted February 2, 2011 Share #2 Posted February 2, 2011 I'd say that is a lens problem. I have a 35mm f/2 Cron ASPH that does not vignette at all on the M8. remember a 35mm on the M8 is like a 50 on any FF camera. The M8 is only using part of the image circle the 35mm lens produces Link to post Share on other sites More sharing options...
UliWer Posted February 2, 2011 Share #3 Posted February 2, 2011 I have an M8 with a 35mm Elmarit f/2.8 lens. It is not 6-bit coded but, I purchased a (very cheap) kit to code it myself with a Sharpie (seems like they work for others, but... BoPhoto.com: M8 coder - simple manual handcoding of M lenses). I have a UV/IR filter and camera set to "Lens detection - On + UV/IR". I'm still getting vignetting on the edges as shown in the photo linked below. Sometimes it's not too noticeable but, other times it is horrible. Here's a link to Photobucket to a sample of the problem: http://i287.photobucket.com/albums/ll142/johnmaloof/L9990781.jpg Is it the coding that I'm getting wrong? Any help from you guys would be great. Thanks! I am not quite sure which lens you use: 2.8/35 Summaron or 2/35 Summicron. There has never been a 35mm Elmarit for the M8. Nonetheless if you use wide angle lenses with UV/IR-Filters you need the function for lens detection. This reduces vignetting and most of all it removes the cyan shift caused by the filter you can see on your snow scene. The filter alone does not reduce vignetting! So probably your manual coding does not work. Do you get any dates for the lens in your EXIF? Link to post Share on other sites More sharing options...
johnmaloof Posted February 2, 2011 Author Share #4 Posted February 2, 2011 Sorry, I meant 28mm, not 35mm. I'm coming from an M6 so it has the same frame as 35mm on the M8. Link to post Share on other sites More sharing options...
farnz Posted February 3, 2011 Share #5 Posted February 3, 2011 To find out if the coding is working check the EXIF file (or Info on the LCD after you've taken the shot) to see whether it includes the focal length of the lens. If not then your M8's not recognising the coding yet. This looks like cyan drift to me so I don't think your M8 has seen the coding. I get a similar look with my CV 15/4.5 when the coding's not recognised. Pete. Link to post Share on other sites More sharing options...
ho_co Posted February 3, 2011 Share #6 Posted February 3, 2011 John, all wide-angles vignette a bit. I don't think there's anything wrong with the lens or the camera. And in this case, as Pete suggested, the image EXIF shows that the camera did not recognize the lens, but just applied the default correction. Link to post Share on other sites More sharing options...
ishkra Posted February 3, 2011 Share #7 Posted February 3, 2011 Advertisement (gone after registration) I have an M8 with a 28mm Elmarit f/2.8 lens. It is not 6-bit coded but I have the same lens and i coded in the same way as you...absolutely no vignetting !!...try to take more pictures in different conditions of light and check the EXIF if the camera recognize the lens Link to post Share on other sites More sharing options...
gravastar Posted February 3, 2011 Share #8 Posted February 3, 2011 As others have suggested I suspect the coding isn't being recognised. One thing to bear in mind is that not all "sharpies" are equal. The camera uses infrared sensors to read the lens coding and not all pen inks are opaque to infrared. The mixture of blue and red dyes used to make black can be transparent. If the coding isn't being recognised try a different pen or a thicker application of ink. ETA: I've just seen this thread which may be useful. Bob. Link to post Share on other sites More sharing options...
johnmaloof Posted February 5, 2011 Author Share #9 Posted February 5, 2011 After reading elgenper's comment in another forum, I managed to just mark the code myself without a guide. It works! I haven't checked for vignetting yet but the camera does recognize the lens. Thanks everyone! Link to post Share on other sites More sharing options...
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