chris_tribble Posted November 22, 2013 Share #1 Â Posted November 22, 2013 Advertisement (gone after registration) Does anyone happen to know what the 6 bit code sequence is for this lens? The lens comes up on the manual lens selection option on the M-240, but I have no idea what the actual code is. Malcolm Taylor's trying to find out, and as he's not interneted, I said I'd ask . Thanks for any advice. Link to post Share on other sites More sharing options...
Advertisement Posted November 22, 2013 Posted November 22, 2013 Hi chris_tribble, Take a look here 6 bit code for 35mm Summilux f1.4 pre-aspherical. I'm sure you'll find what you were looking for!
01af Posted November 22, 2013 Share #2 Â Posted November 22, 2013 There is no 6-bit code for this lens. Link to post Share on other sites More sharing options...
chris_tribble Posted November 23, 2013 Author Share #3 Â Posted November 23, 2013 O1af - can I clarify this? Â 1. Leica give a menu option for the lens on the M-240 under Manual Lens Selection - so I can assume that there's a profile? Â 2. However, there's no published 6-bit code available which can be manually added to the lens... Â Isn't this similar to the situation with the 135 A-T 3.4 where there was a manual selection option available, but no code released initially? Isn't there an implication that if a lens can be selected, there's a code lurking somewhere? Or did I get this wrong? Â Not a disaster - but interesting to see if it's possible to clarify. Â Best. Link to post Share on other sites More sharing options...
gabriel Posted November 23, 2013 Share #4 Â Posted November 23, 2013 The 135 A-T 3.4 now comes precoded when purchased new. This has only been for the last 6 months or so. Previously it was sold uncoded. I think that it is now possible that on new lenses the focus specs could be tighter Link to post Share on other sites More sharing options...
Duane Pandorf Posted November 23, 2013 Share #5 Â Posted November 23, 2013 Does anyone happen to know what the 6 bit code sequence is for this lens? The lens comes up on the manual lens selection option on the M-240, but I have no idea what the actual code is. Malcolm Taylor's trying to find out, and as he's not interneted, I said I'd ask .Thanks for any advice. Â Morning Chris. I'm not at my computer as I'm on my iphone. I too shoot with this lens and did find its lens code but its the code you would use in EXIF data. Even if you use the manual code on my M-E Lightroom thinks its a 35mm Summicron. I don't think the code I have bookmarked translates to a 6 bit code that can be made on the lens mount so that you can use the camera's auto function. Â I use a Lightroom plugin called Lenstagger to correct the lens EXIF data after import. Link to post Share on other sites More sharing options...
lct Posted November 23, 2013 Share #6 Â Posted November 23, 2013 Did not find lot of difference between available manual codings i must say. I would just avoid 35/1.4 aspherical (11873) and 35/2 asph (11879/1882) which bring a bit more color cast than others. It is not the case with the 35/2 pre-asph coding (11310/11311) which sounds good but applies less vignetting correction than 35/1.4 asph v1 (11874/11883) at f/1.4 and f/2. The latter is even more efficient at that than the 35/1.4 pre-asph coding (11869/11870/11860) and does not bring any more color shift. I did my tests at f/1.4 and f/2 only though so i don't know how it works at other apertures. Link to post Share on other sites More sharing options...
01af Posted November 23, 2013 Share #7  Posted November 23, 2013 Advertisement (gone after registration) Leica give a menu option for the lens on the M (Typ 240) under Manual Lens Selection—so I can assume that there's a profile? Yes.   However, there's no published 6-bit code available which can be manually added to the lens ... Yes.   Isn't this similar to the situation with the Apo-Telyt-M 135 mm 1:3.4 where there was a manual selection option available, but no code released initially? Yes.   Isn't there an implication that if a lens can be selected, there's a code lurking somewhere? No. Or more precisely—yes, there is a code, but it cannot expressed in six black or white code patches on the bayonet's flange.  Some lenses don't have a 6-bit code so they cannot be 6-bit-coded but selected manually from the lens-selection menu only. The pre-Asph Summilux 35 mm 1:1.4 belongs to these. So do the Summilux-M 35 mm 1:1.4 Aspherical and the Noctilux 50 mm 1:1.2, for example. Link to post Share on other sites More sharing options...
Duane Pandorf Posted November 23, 2013 Share #8 Â Posted November 23, 2013 Did not find lot of difference between available manual codings i must say. I would just avoid 35/1.4 aspherical (11873) and 35/2 asph (11879/1882) which bring a bit more color cast than others. It is not the case with the 35/2 pre-asph coding (11310/11311) which sounds good but applies less vignetting correction than 35/1.4 asph v1 (11874/11883) at f/1.4 and f/2. The latter is even more efficient at that than the 35/1.4 pre-asph coding (11869/11870/11860) and does not bring any more color shift. I did my tests at f/1.4 and f/2 only though so i don't know how it works at other apertures. Â So if I understand the results of your tests with manual lens corrections in camera using the Leica 35mm Summilix pre-ASPH type 11870 you would use the 35 f/1.4 ASPH. 11874/11883 to get the best vignette correction? Link to post Share on other sites More sharing options...
lct Posted November 23, 2013 Share #9 Â Posted November 23, 2013 At f/1.4 and f/2 yes but it is not night and day by far and i don't know how it works at smaller apertures. AFAIC i use mosty my 35/1.4 pre-asph as a special 50 for portrait on my M8.2 where i don't correct it at all and i'm content with the 35/1.4 pre-asph setting of the M240. FWIW. Link to post Share on other sites More sharing options...
Duane Pandorf Posted November 23, 2013 Share #10 Â Posted November 23, 2013 At f/1.4 and f/2 yes but it is not night and day by far and i don't know how it works at smaller apertures. AFAIC i use mosty my 35/1.4 pre-asph as a special 50 for portrait on my M8.2 where i don't correct it at all and i'm content with the 35/1.4 pre-asph setting of the M240. FWIW. Â I'm shooting with this lens on the M-E and normally shoot wide open to f2.0. So I hadn't really experimented with different manual lens correction settings in camera. Link to post Share on other sites More sharing options...
lct Posted November 23, 2013 Share #11 Â Posted November 23, 2013 Worth a try then but i don't know how it works on the M-E at all. Link to post Share on other sites More sharing options...
adan Posted November 23, 2013 Share #12 Â Posted November 23, 2013 When I had a 35 Summilux pre-ASPH, I used the coding (via permanent marker pen) for the 35 Summicron pre-ASPH. Based on the fact that they have very similar optical construction (6-element double-gauss, with a seventh element behind the aperture for field flattening.) Did a good job of removing slight cyan vignetting at the long ends of the picture. Â The difference between the 35 pre-ASPH Summilux and the 135 f/3.4 is that the latter is built with the "normal" thin modern M lens flange, attached with 5-6 screws from the rear. The much older 35 pre-ASPH mount (never changed much during the 30+-year production run) is much thicker and knurled, and attached with screws from the side - so Leica would have had to use machining, abandoned 20 years ago, to make "coded" mounts just to fit that specific lens. Â http://www.kenrockwell.com/leica/images/35mm-f14/D3S_8291-vs-asph.jpg Link to post Share on other sites More sharing options...
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