bla Posted November 30, 2014 Share #1 Posted November 30, 2014 Advertisement (gone after registration) Hello M9/MM-users, while checking the different lens code lists online I thought it'd be interesting to look at the lens codes in the camera. I did so and there are some questions now... I have some columns that I don't understand. (marked with ?) is that of any meaning to anyone? Also I noticed the following: - Elmarit-M 135/2.8 11829 does apparently show an incorrect focal length of 647mm. Is that noticeable in the exif or in camera? I don't have that lens. - new Summilux 28/1.4 will probably have the number 11668 (been there since M9 v1.196) - 50mm Apo Summicron 11141 has been included since M9 v1.162 - Does anyone know a 14mm/f3.8 lens? Is there anything else incorrect or implausible? Thanks! lenscodes.pdf Link to post Share on other sites More sharing options...
Advertisement Posted November 30, 2014 Posted November 30, 2014 Hi bla, Take a look here MM/M9 6bit code list from v1.202/v1.008. I'm sure you'll find what you were looking for!
jaapv Posted November 30, 2014 Share #2 Posted November 30, 2014 100111 for the 135/4.0 is clearly wrong as it shows the same code for the 90/4.0 Link to post Share on other sites More sharing options...
bla Posted November 30, 2014 Author Share #3 Posted November 30, 2014 But the frameline lever is in a different position, isn't it? Internally, the lens code is done via combination of 6bit code + 2bit frameline selector position, which fits neatly in 8bit=1 byte. So it wouldn't have to be false right away... Link to post Share on other sites More sharing options...
jaapv Posted November 30, 2014 Share #4 Posted November 30, 2014 True. I've been telling people that all along - now I should be telling myself.... Link to post Share on other sites More sharing options...
bla Posted November 30, 2014 Author Share #5 Posted November 30, 2014 No problem! I'm still curious about the crazy focal length of the 135/2.8 though. Does anyone own that lens with 6bit coding? Or maybe someone can draw the lens code on a piece of paper and move the frameline lever in the right position... Link to post Share on other sites More sharing options...
jaapv Posted November 30, 2014 Share #6 Posted November 30, 2014 The 135/2.8 brings up the 90 mm framelines. Link to post Share on other sites More sharing options...
bla Posted November 30, 2014 Author Share #7 Posted November 30, 2014 Advertisement (gone after registration) Well at least that is correct in my list. Why does it show 90mm framelines? Are there some goggles to go with it? The main question is if the focal length is recorded from that list. If so, there should be a strange value for the 11829. Concerning the 14/3.8... does that exist? Link to post Share on other sites More sharing options...
carlmuck Posted November 30, 2014 Share #8 Posted November 30, 2014 No problem! I'm still curious about the crazy focal length of the 135/2.8 though. Does anyone own that lens with 6bit coding? Or maybe someone can draw the lens code on a piece of paper and move the frameline lever in the right position... 135/2.8 is the Elmarit-M 135mm/f 2,8 Link to post Share on other sites More sharing options...
bla Posted November 30, 2014 Author Share #9 Posted November 30, 2014 That explains the 90mm frameline. Thanks! But what about the focal length? It has been like that since the beginning... Link to post Share on other sites More sharing options...
mjh Posted November 30, 2014 Share #10 Posted November 30, 2014 But what about the focal length? It has been like that since the beginning... 647–135 = 512, a power of 2 (2^9). This can hardly be a coincidence; it suggests the most significant bit of this byte is used as a flag of some sort. Link to post Share on other sites More sharing options...
bla Posted November 30, 2014 Author Share #11 Posted November 30, 2014 That is correct, I should have mentioned that. The byte that is 0 with all the other lenses is 2 in that case. I think that is an error, but I don't know for sure. You have a good eye for numbers! Link to post Share on other sites More sharing options...
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