scott kirkpatrick
Well-known member
Having the M-coder makes it relatively easy to explore (or "reverse-engineer") what the M8 firmware is actually doing so that one can make intelligent choices of how to code various lenses of interest for use with the M8.
For example, I tried my CV21/4 in the M-mount recently with both the Elmarit 21/2.8 pre-asph and the 21/2.8 asph codes and to within the accuracy of my testing, the two corrections were identical. This is based on just comparing the center and one corner in a series of white wall shots in indirect daylight at various apertures with and without a Leica filter installed. To be really sure takes more work analyzing the resulting images, and may take more careful setup, artificial light, etc. The firmware corrections can't be perfect since different light temperatures and different apertures require different corrections, but the M8 does appear to be trying to compensate for the increased luminance vignetting that occurs with the lens wide open.
My day job is keeping me pretty busy at the moment, but what questions do you want addressed next in this area? Which lens coding choices seem most important, what light environments, etc...? I can't promise instant answers, but will try to consider some of these.
scott
For example, I tried my CV21/4 in the M-mount recently with both the Elmarit 21/2.8 pre-asph and the 21/2.8 asph codes and to within the accuracy of my testing, the two corrections were identical. This is based on just comparing the center and one corner in a series of white wall shots in indirect daylight at various apertures with and without a Leica filter installed. To be really sure takes more work analyzing the resulting images, and may take more careful setup, artificial light, etc. The firmware corrections can't be perfect since different light temperatures and different apertures require different corrections, but the M8 does appear to be trying to compensate for the increased luminance vignetting that occurs with the lens wide open.
My day job is keeping me pretty busy at the moment, but what questions do you want addressed next in this area? Which lens coding choices seem most important, what light environments, etc...? I can't promise instant answers, but will try to consider some of these.
scott