mike prevette Posted November 29, 2006 Share #1 Posted November 29, 2006 Advertisement (gone after registration) I'll call it Voigt-o-Cron! Two layers of standard cloth camera tape (skinny gaffers tape) trimmed to the mount, and the trusty sharpie turned my LTM Voigtlander into a Voigt-o-Cron. Link to post Share on other sites More sharing options...
Advertisement Posted November 29, 2006 Posted November 29, 2006 Hi mike prevette, Take a look here Coded Voigtlander 28mm Ultron. I'm sure you'll find what you were looking for!
earleygallery Posted November 29, 2006 Share #2 Posted November 29, 2006 Kewl! But really, with all the other issues the M8 now needs to be held together with black tape! Link to post Share on other sites More sharing options...
mike prevette Posted November 29, 2006 Author Share #3 Posted November 29, 2006 Also just a note. The coding is tied to the framelines as well as the mount. So for my Ziess 21mm I can turn the coding on or off just by pressing the frameline selection lever. Actually a cool function born out of this madness. _mike Link to post Share on other sites More sharing options...
scott kirkpatrick Posted November 29, 2006 Share #4 Posted November 29, 2006 Also just a note. The coding is tied to the framelines as well as the mount. So for my Ziess 21mm I can turn the coding on or off just by pressing the frameline selection lever. Actually a cool function born out of this madness. _mike Nice work. I guess this handles the LTM mount problem without changing the lens-to-flange distance. Does the frameline selection trick work with any coded lens, for example with Leica's? So you can turn off the camera's firmware image adjustments just by shifting frames? I would think so, but it's better to ask. scott Link to post Share on other sites More sharing options...
mike prevette Posted November 29, 2006 Author Share #5 Posted November 29, 2006 Scott, I can't think of why not. There is nothing more complicated going on here so it is plausable that coded Leica lenses could be switched 'off' with a press of the lever. Annoying, but still usefull to those of us who don't like the camera mucking wth things. As far as the flange length and rangefinder cam distance, nothing is effected because the tape lies in a recess of the LTM to M mount adapter. _mike Link to post Share on other sites More sharing options...
bill Posted November 29, 2006 Share #6 Posted November 29, 2006 Mike, you are a one-man Enigma machine! I'm dead impressed! Regards, Bill Link to post Share on other sites More sharing options...
mike prevette Posted November 29, 2006 Author Share #7 Posted November 29, 2006 Advertisement (gone after registration) Mike, you are a one-man Enigma machine! I'm dead impressed! Regards, Bill Some of my ex-girlfriends would probably agree with you. _mike Link to post Share on other sites More sharing options...
mike prevette Posted November 30, 2006 Author Share #8 Posted November 30, 2006 Another hint I just figured out. Sometimes the lens mount screw on the Zeiss and some Leica lenses interferes with the code reading ( camera thinks its a black mark -x- or 1 depending on how you want to say it. So I just put a drop of white enamel on the screw. _mike Link to post Share on other sites More sharing options...
davidada Posted November 30, 2006 Share #9 Posted November 30, 2006 Mike, where did you find the coding schematics for the lenses? Link to post Share on other sites More sharing options...
davidada Posted November 30, 2006 Share #10 Posted November 30, 2006 ignore my question! found the thread Link to post Share on other sites More sharing options...
sean_reid Posted November 30, 2006 Share #11 Posted November 30, 2006 Way to go Mike! Sean Link to post Share on other sites More sharing options...
sean_reid Posted November 30, 2006 Share #12 Posted November 30, 2006 Thanks to your idea and Bob's template, I just successfully coded a CV 35/2.5 Pancake II as a 35/2.0 Summicron. Great stuff. Cheers, Sean Link to post Share on other sites More sharing options...
mike prevette Posted November 30, 2006 Author Share #13 Posted November 30, 2006 Glad it's working out for you! Also many thanks to Bob for the template. _mike Link to post Share on other sites More sharing options...
scott kirkpatrick Posted November 30, 2006 Share #14 Posted November 30, 2006 Thanks to your idea and Bob's template, I just successfully coded a CV 35/2.5 Pancake II as a 35/2.0 Summicron. Great stuff. We may be arguing 1/6 stop nits and lice here, but wouldn't it be better to code up a pancake as an Elmarit, on the assumption that you want to look like the smallest, shortest lens in the catalog at 35mm? Of course now, with one CV, you can be both, and post the firmware-corrected results of either disguise! If you take pictures of walls much longer, you may turn into Carl Weese. scott edit: not meant as in insult to either of you. Carl (see his blog, Working Pictures) can make an interesting picture out of a brick wall or garage door, which is not a common talent. Link to post Share on other sites More sharing options...
carstenw Posted November 30, 2006 Share #15 Posted November 30, 2006 Mike and Sean, I would love to add these two lenses to the table in my sig, but before I do so, I would like to have before and after shots of a uniformly lit surface, to show that the vignetting is actually improved by these changes. Ideal would be to also have shots with the IR filter where it is visible that the cyan corners have improved. Do you have such shots, or are you strictly going for the EXIF information? Link to post Share on other sites More sharing options...
mike prevette Posted November 30, 2006 Author Share #16 Posted November 30, 2006 I Haven't had a chance to do hardcore tests yet. And personally I'm really not even interested in actually using this feature till Leica provides us with some control over whats happening to our raw data. That being aid i will see what I can do. I'm away from the computer for most of tomorrow though. Possibly Sean, being the test expert he is will indulge us with some examples. _mike Link to post Share on other sites More sharing options...
scott kirkpatrick Posted November 30, 2006 Share #17 Posted November 30, 2006 I Haven't had a chance to do hardcore tests yet. And personally I'm really not even interested in actually using this feature till Leica provides us with some control over whats happening to our raw data. That being aid i will see what I can do. I'm away from the computer for most of tomorrow though. Possibly Sean, being the test expert he is will indulge us with some examples. _mike Given his current direction in the comparisons of 28mm WA lenses, I wouldn't be too surprised to see his two examples of the Elmarit and Summicron with and without the firmware corrections enabled supplemented with the same comparisons for an Ultron 28/1.9 and a CV28/3.5 pancake-like lens. Coding provided, of course, by Sharpie Dotz. This isn't a slam dunk, as the two CV lenses are the outliers in the collection of 28's, as far as vignetting characteristics are concerned, and the two Leica lenses are more in the middle. We might also want to wait for this to be done with the 1.10 M8 firmware that is scheduled to be released next week, so that the results will have some more lasting validity. I've done some analysis of Sean's latest data, which doesn't involve the firmware. I'll post it in the Sean's latest article thread. scott Link to post Share on other sites More sharing options...
erl Posted November 30, 2006 Share #18 Posted November 30, 2006 I tried coding several of my lenses using the template. Not a sausage! Do the 'blank' spaces need to be white, or is the actual silver of the mount good enough? I just blacked in the X's and left the 0's unmarked. Any comments appreciated. Thanks, Erl Link to post Share on other sites More sharing options...
scott kirkpatrick Posted November 30, 2006 Share #19 Posted November 30, 2006 Do the 'blank' spaces need to be white, or is the actual silver of the mount good enough? I just blacked in the X's and left the 0's unmarked. Any comments appreciated. From the other thread, silver seems to work just fine as the equivalent of white. After all, an unmarked mount is interpreted as 000000, the code for "uncoded." scott Link to post Share on other sites More sharing options...
mike prevette Posted November 30, 2006 Author Share #20 Posted November 30, 2006 You have to be very accurate with your coding. The LED's reading the code are very small. Also the outer edge of the lens mount is the side doing the detection. And any form of light thinner or alcohol will remove sharpie very easily Were you reading the code in the right direction? Link to post Share on other sites More sharing options...
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