Archived posting to the Leica Users Group, 2007/05/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Steve, I agree with you 100%. I've taken maybe 3000 M8 photos before I received a coded lens. Most of my photos are taken in natural light and with a varied mix of lenses including extreme WA with no problems. I was able to duplicate the magenta and cyan problems during experimentation but never during my normal picture taking. The only times I keep the IR/UV filter on a lens is when I take my flower photos with my macro 90. That lens doesn't need coding. I now have the WATE, which is coded, which I use without a filter with no problem. All of my photos are in color. Len On May 8, 2007, at 11:28 AM, Steve Barbour wrote: > this is beautifully explained by Leonard, much better than I could > do... > > though as I went through it...Leica's fixes and counter fixes seem > absurd in the extreme... > > Let me say...I use an M8...I use latest firmware, widest lens 21mm, > no filters, no lens coding...have had no problems. > > I shoot mainly bw, though when I do shoot color I have no problems, > unless I create them... and I must say I have been even more > impressed by the color than the bw results... > > The unexpected outcome has been, that the M8 has led me to shoot > more color rather than trying to avoid it. > > > Steve > > > On May 8, 2007, at 7:00 AM, Leonard Taupier wrote: > >> Claudio, >> >> Originally when Leica announced the 6 bit coding it was to >> identify the lens and optimize it's performance. Probably to >> correct for vignetting. >> >> Then it was discovered that the Leica image sensor had a reduced >> infra red filter which caused certain dark materials like >> polyester cloth, leather and even natural colors of flowers to >> turn toward a strong magenta color. >> >> In order to eliminate the magenta caused by the strong IR, Leica >> suggested using a special IR/UV filter to remove the IR and >> correct the off color cast. This is fine but the filter causes the >> edges and the corners of the photo to turn a cyan color. This >> problem is increased as the angle of the light increases through >> the filter. The widest angle lenses are the worst and the >> condition improves as the angle decreases in the lesser angled >> lenses. >> >> Leica found they could correct for this cyan color cast by >> compensating the color of the affected edges of the photo. Since >> the amount of compensation is different for the different lenses, >> the camera has to know what lens is being used when the special >> filter is installed. The way to do this is to code the lenses. >> >> Regards, >> Len >> >> >> On May 8, 2007, at 9:12 AM, Dott. Ing. Claudio Rimediotti wrote: >> >>> Thanks! >>> And now another question: >>> the reason why of this 6-bit code? >>> >>> Thanks again, >>> >>> Claudio >>> >>> ----- Original Message ----- From: "Eric Korenman" >>> <faneuil@gmail.com> >>> To: "Leica Users Group" <lug@leica-users.org> >>> Sent: Tuesday, May 08, 2007 12:47 PM >>> Subject: Re: [Leica] Lenses without 6 bit code in M8 >>> >>> >>>> short answer: none! >>>> >>>> Eric >>>> >>>> >>>> On 5/8/07, Dott. Ing. Claudio Rimediotti >>>> <studio.rimediotti@iol.it> wrote: >>>>> >>>>> I'd like to know what are the problem to use old Leica lens >>>>> without 6 bit >>>>> code in an M8. >>>>> >>>>> Thanks, regards from Italy! >>>>> >>>>> Claudio Rimediotti >>>>> >>>>> >>>>> _______________________________________________ >>>>> Leica Users Group. >>>>> See http://leica-users.org/mailman/listinfo/lug for more >>>>> information >>>>> >>>> >>>> _______________________________________________ >>>> Leica Users Group. >>>> See http://leica-users.org/mailman/listinfo/lug for more >>>> information >>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information