Clark.EE
Well-known
Yes, it is normal for the M9 with fast lenses ... just correct it in software. http://en.wikipedia.org/wiki/Purple_fringing
douglasf13
Well-known
Yep, this is pretty normal, and Lightroom 4 allows you to correct it (it does an okay job.) Granted, the Nokton 35/1.2, 35/1.4 and 50/1.5 do seem to have a bit more of a problem with it than other lenses, but most fast lenses have at least a little bit of it.
ChrisN
Striving
Not just M9; many other digital cameras too.
CaptZoom
Established
Color fringing easily corrected in pp. not really worth worrying or combining about.
jaapv
RFF Sponsoring Member.
Join the digital club 
The sharper your lens and the better your sensor, the more fringing in high-contrast and overexposed situations will be seen. It depends on the CA characteristics of the lens designs too. All raw converters have defringing tools of varying effectiveness. Aperture is a bit hohum, ACR (lightroom-CS) pretty decent, Capture One the best.
Often the defringing is not 100% effective. In that case either use a brush to desaturate the offending color -it can be magenta, blue, green or red or a combination, or a color replacement brush.
The sharper your lens and the better your sensor, the more fringing in high-contrast and overexposed situations will be seen. It depends on the CA characteristics of the lens designs too. All raw converters have defringing tools of varying effectiveness. Aperture is a bit hohum, ACR (lightroom-CS) pretty decent, Capture One the best. Often the defringing is not 100% effective. In that case either use a brush to desaturate the offending color -it can be magenta, blue, green or red or a combination, or a color replacement brush.
sepiareverb
genius and moron
Camera Raw has managed to deal with this very effectively whenever I have it crop up. Very simple fix.
wogg
Established
To emphasize what's said here, it's fixable in post proc with minor detail loss.
However, this really is probably the biggest weakness of the Nokton. I have it, and love its image quality, but have to think about conditions that produce this and avoid them if I'm trying to maximize initial output quality.
In contrast, the Zeiss ZM 50mm f/2 Planar has next to no CA at all on the M9. I've pretty much switched to using it instead, except for portrait work.
However, this really is probably the biggest weakness of the Nokton. I have it, and love its image quality, but have to think about conditions that produce this and avoid them if I'm trying to maximize initial output quality.
In contrast, the Zeiss ZM 50mm f/2 Planar has next to no CA at all on the M9. I've pretty much switched to using it instead, except for portrait work.
Clark.EE
Well-known
jmc56
Member
It's an interesting question. I've an m9-P which as often as not has the 50mm Nokton and I haven't seen it -- which probably means I just haven't seen the right circumstance but as noted, it's a relatively easy thing to deal with. Within it's limits, the M9 sensor is just fine, but even when I bought it, as good as it was, also obvious that there are pushing the edge areas where other sensors would do better.
Richard G
Veteran
I got this recently in a very nice shot of a friend and his daughter against a window at f1.5 on the Sonnar. I hadn't thought the exposure through enough. Having learnt to manipulate red with the M9 digital sensor it was a short step up the spectrum to fiddle with purple.