Archived posting to the Leica Users Group, 2010/12/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]For anyone interested, this is a response from Leica Camera technical staff following a discussion on the L Camera Forum. I am told that this has been cross posted to the RFF as well. I have not personally experienced any issues at all with my M9 and any wide angle lens that I have shot and this appears to be affected by content, aperture, exposure, processing and possibly individual cameras. ......................................................................................................................... Thank you very much for your information. We have had some complaints about the red edges, you are right. I will give you the full technical explanation for that. On the one side, we do have a very short distance from the lens to the sensor (for this reason the m-system is so compact), on the other side the pixels of the ccd sensor are not symmetric. This combination produces a totally colored and inhomogenious RAW image. To provide a plain and neutral image, we do a lot of complex compensation, sensor corrections and lens vigentting corrections. What we achieve is a nearly neutral image, but unfortunately just "nearly" neutral. The tolerances for the M9 are even tighter as for the M8 with IR-filter, but unfortunately there are some very slight deviations towards red, the obviously are not acceptable for some special applications. We did an improvement in a previous update, using the vignetting correction, this improved the effect visibly. But unfortunately we had to recognize that even this was not enough. There are still some complaints, therefore we decided to apply additional correction algorithms for the critical lenses. But developing these need unfortunately some time, because some sequences in the internal data management have to be changed, this is always a difficult and risky modification. Of course correcting this on a PC is an easy thing. But letting the camera do this needs a very simple algorithm, because we would not accept any delay in DNG mode. We are planning to offer this update as soon as possible, but it will need at least until spring 2011. I hope this answer helps you understand the confusion about the red edges. ..................................................................................................................................................... Happy Holidays Geoff http://www.pbase.com/hoppyman