jaay Posted September 10, 2009 Share #1 Posted September 10, 2009 Advertisement (gone after registration) I have not ordered an M9 yet and haven't been able to play with a demo one yet but wondered how everyone's favourite cheap wide angle lens holds up on FF. Anyone got any shots done with a CV 15? How do the corners hold up in terms of sharpness and vignetting? Link to post Share on other sites More sharing options...
Advertisement Posted September 10, 2009 Posted September 10, 2009 Hi jaay, Take a look here CV 15mm on M9 FF. I'm sure you'll find what you were looking for!
sean_reid Posted September 10, 2009 Share #2 Posted September 10, 2009 It's problematic, more later... Cheers, Link to post Share on other sites More sharing options...
eldelbo Posted September 10, 2009 Share #3 Posted September 10, 2009 It's problematic, more later... Cheers, Oh dear. Got both on order currently.... Link to post Share on other sites More sharing options...
Bo_Lorentzen Posted September 10, 2009 Share #4 Posted September 10, 2009 Sean - I take it you tested it already..? I was thinking to take my 15mm to Samy's while they have the M9 there. figure the UVIR need to come off. Hmm. problematic, that will be interesting. . Link to post Share on other sites More sharing options...
markowich Posted September 10, 2009 Share #5 Posted September 10, 2009 Sean - I take it you tested it already..? I was thinking to take my 15mm to Samy's while they have the M9 there. figure the UVIR need to come off. Hmm. problematic, that will be interesting. . unfortunately it gives extreme color vignetting, bad purple corners. real bad. i sent it back immediately. very unfortunate... peter Link to post Share on other sites More sharing options...
luigi bertolotti Posted September 10, 2009 Share #6 Posted September 10, 2009 I remember well when CV 15 appeared on the market... my dealer tested one on my M4 and we agreed that, Ok, it vignetted quite significantly, but when hell have we ever seen such a cheap and small 15 so honestly performing ? So, no surprise at all it can be problematic onto M9... maybe we are too acustomed to its well-cropped image circle on M8.... My idea is that, when someday I'll have a M9, it will be the case to find a good software adjustement solution... Link to post Share on other sites More sharing options...
offshore Posted September 10, 2009 Share #7 Posted September 10, 2009 Advertisement (gone after registration) It's problematic, more later... Cheers, Oh, you tease! Link to post Share on other sites More sharing options...
jackal Posted September 10, 2009 Share #8 Posted September 10, 2009 i think my zeiss 18mm might be giving me some mad colour cast on one side as well Link to post Share on other sites More sharing options...
Double Negative Posted September 11, 2009 Share #9 Posted September 11, 2009 It's got some *serious* corner vignetting. Link to post Share on other sites More sharing options...
sean_reid Posted September 11, 2009 Share #10 Posted September 11, 2009 Sean - I take it you tested it already..? . Yes, I need to look at the results again before getting into details. Link to post Share on other sites More sharing options...
ho_co Posted September 11, 2009 Share #11 Posted September 11, 2009 Wouldn't Sandy's CornerFix work here as well? Or is it designed only for loss of red? Link to post Share on other sites More sharing options...
sean_reid Posted September 11, 2009 Share #12 Posted September 11, 2009 Wouldn't Sandy's CornerFix work here as well? Or is it designed only for loss of red? Hi Howard, There's significant vignetting from that lens on the M9 (and on film?) that nothing will really fix. One would just need to accept the vignetting as part of the picture. Trying to fix it digitally would be, IMO, futile. There are ways to correct for the cyan drift, of course. Cheers, Sean Link to post Share on other sites More sharing options...
sandymc Posted September 11, 2009 Share #13 Posted September 11, 2009 Wouldn't Sandy's CornerFix work here as well? Or is it designed only for loss of red? CornerFix will fix both regular vignetting and red, but once you get up past 4 stops or so of loss in the corners, you start to get to the point that there just isn't much information left for CornerFix to work with, so you start to see noise in corners, etc. BTW, an M9 optimized version of CornerFix will be out in a day or two. Sandy Link to post Share on other sites More sharing options...
gwelland Posted September 11, 2009 Share #14 Posted September 11, 2009 I'm sure Sandy will chime in here but, from memory when I went through a porting exercise with the code, the algorithm used within CornerFix looks at the colour vignette radially from the center of the reference image and builds a correction curve. IIRC it sampled vertically/horizontally and diagonally to build a best fit characteristic curve for an uneven field. This correction curve is then applied to the RGB matrix to even out both the colour and brightness vignette. Theoretically it should correct for the problem although you might not like what you see if the brightness is brought up significantly in the corners! Link to post Share on other sites More sharing options...
gwelland Posted September 11, 2009 Share #15 Posted September 11, 2009 Aha! Ears must have been burning across continents while I was typing that up! Link to post Share on other sites More sharing options...
sandymc Posted September 11, 2009 Share #16 Posted September 11, 2009 I'm sure Sandy will chime in here but, from memory when I went through a porting exercise with the code, the algorithm used within CornerFix looks at the colour vignette radially from the center of the reference image and builds a correction curve. IIRC it sampled vertically/horizontally and diagonally to build a best fit characteristic curve for an uneven field. This correction curve is then applied to the RGB matrix to even out both the colour and brightness vignette. Theoretically it should correct for the problem although you might not like what you see if the brightness is brought up significantly in the corners! Just so Sandy Link to post Share on other sites More sharing options...
adan Posted September 11, 2009 Share #17 Posted September 11, 2009 C/V 15 - M9 examples here: http://www.l-camera-forum.com/leica-forum/leica-m9-forum/98128-m9-report-salt-lake-city.html Would love to hear from the cornerfix users.... Link to post Share on other sites More sharing options...
etienne_werner Posted September 11, 2009 Share #18 Posted September 11, 2009 Hi, Has any one already tried the CV 12mm on the M9? Kind regards, Etienne Link to post Share on other sites More sharing options...
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