M9: moire/coloured artifacts problem

35mmdelux

35mmdelux

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Erwin puts makes reference to these artifacts problems. Anybody got first hand skinney on this? Is it a problem or not a problem?

Thanks -
 
According to what he wrote, it has something to do with RAW processing programs. I haven't heard anyone else mention this or complain about it, so if you were to buy one, enjoy it. I'm a very jealous!
 
35mmdelux said:
Erwin puts makes reference to these artifacts problems. Anybody got first hand skinney on this? Is it a problem or not a problem?

Thanks -
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It is true that different RAW converters seem to handle things better or worse, but also remember Puts is testing the extremes on a test bed. In real world shooting its not something you come acrosss day to day and far to much is read into it as being a problem, and even then its easily solvable in a number of ways in post processing.

Steve
 
Yesterday I tried to to replicate this -- shooting wire mesh at different angles, etc. -- and have yet to create any problems. Of course these things normally happen when you least expect them, not when you're trying to replicate them.

Cheers,

R.
 
Just any digital camera will produce moirè under certain circumstances. Except for those with a pixel count higher than 30 million, according to Hasselblad. M9 is bound to produce moirè, just like, say, Canon 1Ds III. I would be more concerned about M9's corner sharpness with super wide angle lenses. Like the WATE.
 
Olsen said:
Just any digital camera will produce moirè under certain circumstances. Except for those with a pixel count higher than 30 million, according to Hasselblad. M9 is bound to produce moirè, just like, say, Canon 1Ds III. I would be more concerned about M9's corner sharpness with super wide angle lenses. Like the WATE.
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No corner sharpness problems with the Summilux 24 I can attest...:) It is not real moire, btw, but a demosaicing artefact. Aperture is worst, LR/CS4 nearly as bad, Capture One is least affected.
 
Interesting topic. Can someone fill me in on this?
I thought that moire was an AA filter issue and in that case I didn't think the M9 had an AA filter?
I know early Nikon DSLR's had moire issues sometimes even with their AA filter and CCD sensor (similar technology as the M9's) and this was a hot topic on Nikon forums.
The company changed the AA filter somehow and the problem went but that may not apply with the M9.
 
It's going to happen when the image changes faster than the Bayer pattern Mosaic Filter can keep up with. In most cases, the algorithm that performs the RGB generation and spatial interpretation could be changed to solve the problem. The "standard" interpolation scheme should work most of the time. I've not looked into how many software algorithms are available to correct the issue.

I had some fun with it.

http://www.rangefinderforum.com/forums/showthread.php?t=85011
 
The moire issues has certainly been well covered. As to the second part of your question, the color artifacts. This takes place as you enter the cusp of resolution (lp/mm). Both the M8x and the M9 perform close enough to say neither system is better in this area. What it all boils down to is the greater the resolution, the further you push this issue out of the picture (pun intended). Also, the degree of contrast has an effect on this issue. Higher contrast means the greater this issue will be. What I find interesting in his research, was that he found a RAW processor that did not display this, but there was a loss in resolution. If you convert to B&W this whole issue does not exist. I hope this helps.

As to actual use, yes I have encountered this issue, and it drives me nuts. But, it is not a common problem, as most of the time you are not photographing things that excite this region of resolution. As an example, I have had distant tree branches display this effect.
 
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I have bought the M9 last month and sure it is a great camera.
Every now and them, however, I am getting moiré from tiled roofs.
How do you deal with these in Photoshop?
I can post image samples if that would help.

thanks in advance.
 
I have seen it a few times. I don't care, I just consider when it might occur. The M9 and lenses are worth far, far more to me than the few times this happens. I am just glad to be back shooting Leica after a number of years not using my M2 and associated equipment. I have a new Mac i7 coming today to replace my older PowerBook so processing the raw should be much nicer.
 
Maybe the message did not get through. I try again: I am not complaining. I am very happy with the camera. I just want to fix the few pictures that needs moire fixing. Thanks.
 
Orio said:
Maybe the message did not get through. I try again: I am not complaining. I am very happy with the camera. I just want to fix the few pictures that needs moire fixing. Thanks.
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You cannot fix moire artifacts in photoshop. You might be able to prevent it on-site when you're taking the picture by defocusing the lens a bit, or by using a longer shutter speed and permitting some motion blur.

The M9 has no anti-aliasing filter (which adds a bit of blur) so you have to add the blur yourself. (Blur has to be added before the image hits the sensor, not after!)
 
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