Дальномер

I've done some further work on this question, and in summary:

1. I think the issue that we are seeing is caused by de-centering between the lens and sensor, leading to asymmetries in vignetting. It is not clear where exactly the de-centering is coming from, but the most likely explanation is manufacturing variations in the lens. This de-centering does also exist on the M8, but the impact is small enough to mostly be invisible.

2. It also seems likely that there is variation with aperture; the problem seems to get worse at larger apertures.

3. Leica's best course to fix the problem, or at least make it less visible, is probably just to reduce red correction for the 18mm. This will leave the right hand side of the images Tim showed under compensated, but that's a lot less visible that over compensation. This can easily be done in firmware.

4. CornerFix, in its current form, can't fix this problem. The reason is that CornerFix is designed only to deal with symmetrical vignetting. I'm currently working on a new version that removes this restriction.

For those interested in a whole bunch of charts, and a far more detailed explanation, I've posted one here: ChromaSoft: Vignetting Correction Issues on the Leica M9

BTW, I don't know why this happens mostly on the left hand side of images. I can only speculate that it has something to do with either the way Leica build and calibrate lenses, or the way the M9 is built.

Sandy

но для экстрима нужен 12.
Только вот вопрос: а как у него с разрешением по углам?