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Noctilux 095, M9 and green fringes


Elsu

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Hi there,

 

I have been shooting every day since I got this ultimate combo. One thing that really catches my attention is green fringes come around very often. Honestly, I never really paid much attention to the chromatic aberration before. It can be because the lenses used before are not that sharp ... nor expensive.

 

I have been searching around for comments and discussions about chromatic aberration. There is a lot of comments saying that NX095 has a very good control on the usual blue/purple fringes. Also, the CA issue comes mostly in highlight area, and often overexposed. However, I do not seem to find much about green fringes.

 

There are photos that the green fringes come around in very obvious highlight or overexposed edges.

However, attached are samples that make me wonder a bit (if not concerned :-I

The fringes are inside the red circles. These green fringes do not seem to come in very highlighted or overexposed areas.

 

Are these green fringes an accepted "feature" of the NX095? So if I shoot with F4 and over they should not appear at all? In Lightroom 2 I find it rather difficult to correct the green ones, and so almost every time I need to spend quite some time to get rid of them in Photoshop ...

 

I hope it is not a particular case for my copy of NX095,. And certainly I hope it is neither an issue the M9 at all (and in most of the comments I have read confirm this also).

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The green fringes in the first image may be longitudinal chromatic aberration, or maybe just a consequence of the background being predominantly green. In the other images I am not sure I can even detect green fringing. All in all, I don’t see any real issue that needs to be dealt with.

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That would be an extremely enjoyable combination to use, I'm sure. I don't believe that your camera nor lens is in any way faulty. This and related subjects have come up previously here and seem to be a little contentious or at least not everyone here agrees. One of the contributors posted this link. You may find it interesting and informative as I did.

Chromatic aberrations

May I suggest, do keep in mind that you are examining your photos at very high magnification on your screen, which makes any artefacts much more obvious.

Notice in your examples that you are looking at areas which are out of focus too.

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I must agree with the previous posters that the only shot that shows anything of relevance is the first one, and there I am not sure what I am seeing. It might be CA, but in that case where is the corresponding red edge? Maybe it is some kind of colour bleed in RAW conversion. Any expert comment on this idea?

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It might be CA, but in that case where is the corresponding red edge?

There would not be a corresponding complementary colour edge if it is longitudinal rather than lateral chromatic aberration. Raw converters generally offer no correction tools for correcting longitudinal CA, as opposed to lateral CA which is much easier to correct for digitally. It is quite possible that the Noctilux has some residual longitudinal CA when out of focus.

 

Still, if the examples shown are representative for the severity of this issue, I for one would just stop worrying and leave it as it is.

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Thanks for the replies and comments. It is good to see that it is very unlikely there is any issue with my combo.

I agree on the fact very often these "fringes" are visible only when you blow the image rather big.

 

And apparently it is an issue of longitudinal chromatic aberration.

Attached are 2 more samples, which the green fringes are much more pronounced: 0.95, 1:1 crop. Then again, they are in obvious highlight area, and blurred background.

In sample 6, I get the same thick green/cyan fringe on the edge of that sofa, even when it is not very highlighted, for example at the back of the sofa and not with direct sunlight on.

 

For some images, I simply leave them as they are, as many of you commented, not very noticeable if the image is not blown up big.

However, sometimes that green just comes in rather obvious places such as the eye, like in sample 5. Or then I need to print the image to A3 size or larger. Then Photoshopping is needed.

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Has anyone ever tried there Leica 50 .95 on film to see if this issue is as prevelent as on the M9 sensor. I ask because I dont see this isse with my 0 1.0 Noctilux and film. And come to think about it, I didnt notice when I tested a M9 with my old 50 1.0 version either.

 

Gregory

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I must agree with the previous posters that the only shot that shows anything of relevance is the first one, and there I am not sure what I am seeing. It might be CA, but in that case where is the corresponding red edge? Maybe it is some kind of colour bleed in RAW conversion. Any expert comment on this idea?

 

Presumably the other color fringe is in front of the plane of focus. Which isn't visible in any of these pics.

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Has anyone ever tried there Leica 50 .95 on film to see if this issue is as prevelent as on the M9 sensor. I ask because I dont see this isse with my 0 1.0 Noctilux and film. And come to think about it, I didnt notice when I tested a M9 with my old 50 1.0 version either.

 

Gregory

 

 

While I was waiting for the M9 to arrive, I shot 2 rolls of Velvia on NX095 + M4-2. In all those slides, even around highlight and overexposed edges, the green fringes are just not any issue, if there are any at all. However, there are definite blue/purple fringes around highlight edges.

 

Presumably the other color fringe is in front of the plane of focus. Which isn't visible in any of these pics.

 

tgray

 

That is very true, and sample 7 here shows it very clearly, blue/purple fringes in foreground, green ones in the back. This image was exported straight from M9.

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I am convinced it is not a lens thing. Other lenses and sensors show the same effects, and RAW converters do differ.

Here is a (not very well-focussed :() shot showing the whole gamut of fringing, Vario-Elmar R 105-280, on the DMR. That lens, btw, is exceedingly well colour-corrected, being a close relative of the Vario-Apo-Elmarit R

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So the background shows blue and foreground red.

 

If there is something to do with RAW convertor also, and since Leica kind of recommends Lightroom, hence Camera Raw, so these green fringes are then treated as an accepted "feature" of NX095+M9?

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You'll see green, purple and red as well, if you look carefully. There are other examples in the thread I lifted this from ( http://www.l-camera-forum.com/leica-forum/digital-post-processing-forum/115965-fringing-technical-problem.html , albeit more about purple fringing as well) with another sensor-lens combination. No, I don't think it is a "feature" of the specific Noctilux-M9 combo. I think it is more of a "welcome to the digital world" kind of thing, possibly combined with good ole CA.

In general I find C1 Pro handles these problems better, but I still have to try it out in the newest version of ACR.

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Here is a (not very well-focussed :() shot showing the whole gamut of fringing, Vario-Elmar R 105-280, on the DMR. That lens, btw, is exceedingly well colour-corrected, being a close relative of the Vario-Apo-Elmarit R

Given that the fairly sudden change in the colour of the fringing seems to coincide with the plane of focus, this looks like a lens effect to me. The raw converter couldn’t tell whether a certain circle of confusion was in front of or behind the plane of focus, so why would it paint its rim in different colours (and quite consistently, too), depending on the distance of the reflection causing it? The geometry of the rays creating the circles of confusion switches exactly at the plane of focus, so the assumption of a corresponding switch in the kind of chromatic aberration doesn’t seem too far-fetched.

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That is the CA connection I mentioned in my post, I suppose:o. But I cannot recall seeing anything like this on film, ever, and it seems to be quite common on sensors. Maybe just because the sensor draws more precisely?

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