EricC Posted October 14, 2009 Share #61 Posted October 14, 2009 Advertisement (gone after registration) I could be talking a load of rubbish here, it is not unknown, however was it not stated elsewhere in an other thread, that the lens mount had been moved away from the frame selector to allow for the full size sensor? Link to post Share on other sites More sharing options...
Advertisement Posted October 14, 2009 Posted October 14, 2009 Hi EricC, Take a look here Cv 15mm Versus Leica 18mm. I'm sure you'll find what you were looking for!
sandymc Posted October 14, 2009 Share #62 Posted October 14, 2009 Anyone else got an 18mm 3.8? I have now tried my own one and two others in two different stores and they all do this so maybe it's a design 'feature' Well, here's a thought - what we should do is to shoot a wall or whatever with the same 18mm on both an M8 and an M9, with lens detection off. The offset won't be visually obvious on the M8, but if someone sends me the files, I can analyze them to tell whether its the 18mm or the M9 that's "left handed". Sandy Link to post Share on other sites More sharing options...
carstenw Posted October 14, 2009 Share #63 Posted October 14, 2009 Sandy, I remember when the M8 came out and you wrote CornerFix that I also pointed out that some lenses are decentered, like my CV15. I was so sure that you added decentered lens support at that time. Am I dreaming? Link to post Share on other sites More sharing options...
sandymc Posted October 14, 2009 Share #64 Posted October 14, 2009 Sandy, I remember when the M8 came out and you wrote CornerFix that I also pointed out that some lenses are decentered, like my CV15. I was so sure that you added decentered lens support at that time. Am I dreaming? Carsten, You're not dreaming. I did write a version that had compensation for decentered lenses, but it was never actually released, because it didn't improve the compensation enough to be worth the complication, at least on the M8. However, with the M9, it appears that the complication is worthwhile. Also, what the M9 has shown is that my old approach to decentering actually wasn't all that good. The new version I'm busy with is quite a bit different to that old version in how it deals with decentering, and initial results are very promising...... Sandy Link to post Share on other sites More sharing options...
UliWer Posted October 14, 2009 Share #65 Posted October 14, 2009 Well, here's a thought - what we should do is to shoot a wall or whatever with the same 18mm on both an M8 and an M9, with lens detection off. The offset won't be visually obvious on the M8, but if someone sends me the files, I can analyze them to tell whether its the 18mm or the M9 that's "left handed". Sandy Unfortunately the M9 has to wait for me, so I can only show you some examples of the 3.8/18 with the M8. First a series with UV/IR-Filter and lens detection ON. All shot on a white card with mixed lamp light (only WB was automatically set in LR 2.5, no other corrections). All examples with f 1:3.8 and 160 ASA. By changing the direction from where the light came i tried to falsify my own theory that the red-shift is much influenced by underexposed parts of the picture: 1. automatic exposure, light just behind and above the camera (histogramm shows good exposure - no leaning to either left or right). Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! 2. automatic exposure, light from the left: 3. automatic exposure, light from the right: So what I can say is, the red shift is well visible on the M8, and - in spite of it's colour - not leftist, but rather regular left and right. (May be my lens does not suffer from decentration...) It does not seem to depend on underexposure, but the lighting of the opposite edges may cause it to become more or less visible but without principal differences. Next series will be with lens detection OFF. P.S.: When I switch on the camera and look on the display, I see a clear white picture with no red shift for the first second; only after the in-camera-correction shows me the result, I clearly see the red shift on the cam's display. Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! 2. automatic exposure, light from the left: 3. automatic exposure, light from the right: So what I can say is, the red shift is well visible on the M8, and - in spite of it's colour - not leftist, but rather regular left and right. (May be my lens does not suffer from decentration...) It does not seem to depend on underexposure, but the lighting of the opposite edges may cause it to become more or less visible but without principal differences. Next series will be with lens detection OFF. P.S.: When I switch on the camera and look on the display, I see a clear white picture with no red shift for the first second; only after the in-camera-correction shows me the result, I clearly see the red shift on the cam's display. ' data-webShareUrl='https://www.l-camera-forum.com/topic/99379-cv-15mm-versus-leica-18mm/?do=findComment&comment=1075115'>More sharing options...
ArtZ Posted October 14, 2009 Share #66 Posted October 14, 2009 Uli, What's the thing on the upper right corner visible in every picture? Is something on the wall? Cheers Link to post Share on other sites More sharing options...
UliWer Posted October 14, 2009 Share #67 Posted October 14, 2009 Advertisement (gone after registration) Second series: NO UV/IR-Filter; lens detection OFF; light just behind and above the camera, only WB autocorrection in LR 2.5 (sorry for the edge in the upper right corner, the lens is a little bit too wide for my small white card.) 1. auto exposure Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! 2. exposure minus 1 3. exposure plus 1 I tested the same at ISO 2500: same results, only more noise. So my conclusion would be: it's not the lens, it's no influence of left-wing conspiracy, it's no result of different exposure or direction of light; it's the in-camera- correction of cyan shift caused by the filter. Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! 2. exposure minus 1 3. exposure plus 1 I tested the same at ISO 2500: same results, only more noise. So my conclusion would be: it's not the lens, it's no influence of left-wing conspiracy, it's no result of different exposure or direction of light; it's the in-camera- correction of cyan shift caused by the filter. ' data-webShareUrl='https://www.l-camera-forum.com/topic/99379-cv-15mm-versus-leica-18mm/?do=findComment&comment=1075152'>More sharing options...
ArtZ Posted October 14, 2009 Share #68 Posted October 14, 2009 ... (sorry for the edge in the upper right corner, the lens is a little bit too wide for my small white card.)... Uli, No problem! I was just wondering what it could be In one of my M8 I had some extra horizontal pixel lines and I used to get things like that, especially visible on the camera LCD screen. Link to post Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.