Leica M240 purple / magenta cast

[epand56]

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On 1/16/2020 at 9:30 PM, cobbu2 said:

Since the M240 is full frame, it would make sense that the issue only now becomes noticeable.

Allan, I eventually sold my CV 15/4.5 version 2. The only two ways to correct the magenta cast is using Cornerfix (a computer application) or Adobe Flat-Field (a filter for Lightroom from Adobe), but both methods are quite tricky. This is why I sold the lens. Maybe I will buy version 3 one day, that is free from purple/magenta cast or Italian flag or whatever you call it.

Edited January 19, 2020 by epand56

[lct]

1 hour ago, paulmac said:

Point to remember with the mark1/2 CV 15mm is that on the M8 camera it gives an amazingly good 21mm equivalent lens with zero Italian Flag [...]

+1. Same for the CV 15/4.5 v2 on digital CL. 

[adan]

So just for grins, Paul - have you tried the 15mm v.1 on your Barnack body?

[david strachan]

14 hours ago, paulmac said:

 

On the M9/M240 full frame it's terrible and to me unusable...

My lens is the original mark1 non coupled version and it is probably the best "21mm" lens that I have used from any system BUT that's always on the M8.

 

Sure,   more than great on the M8. Including digital CL. Course they work well on smaller sensors, just using middle of lens.

 

But very useable on the M240 (M-P in my case), but have to use Full Frame correction, or Corner Correction if one uses it..bit of a bother, but we might correct a lot of things in post, so not such a pain really.

Even a lot of the Leica lenses/sensors need similar corrections in post...eg M9, etc

Reminds me of the uv-ir filter users on the M8 grizzlers...even though we all used filters endlessly in the film era.

We have to suffer for our art...no work, no gain.

All best...

[cobbu2]

On 1/16/2020 at 3:41 PM, UliWer said:

Try another coding - e.g. 21mm Elmarit (non asph). The WATE has a completely different lens design which is not much prone to produce the magenta shifts. So there is less correction of this issue for the WATE. It may not go away completely with another correction for you 1. version Super Heliar, but may get less obtrusive. 

 

Thanks, it's worth a shot; the choice is either deal with it in post processing or not use it on my M240. I also use the V1 lens on my film Ms and Barnacks (II, IIIg), I've always been satisfied with the results, so I definitely want to keep it.

[nicoelectra]

On 6/8/2019 at 10:06 PM, Fredrik_Jalhed said:

Hi!

My Leica M240 just came back from Leica-service and have started to show a purple/magenta cast on the right/top side of the frame, depending on which way it is tilted. 

 

Do you guys have any idea what this phenomenon might be? I've used with 7artisans 35/2 and 50/1.1

 

Really appriciate all the help and thoughts I can get!

 

Thanks in advance!

 

/Fredrik 

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Hello          I have the exact same issues with my M240 when using the 7Artisans 35mm f/2.   I have now been using the lens detection set on manual and for the 21mm f/2.8. No more issues with my 7artisans lens have come up.               Hope this helps.

[Monochrome_Man]

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My 3€ for color cast corners... Lens: Voigtlander Color Scopar 21mm f4 LTM + M240

This lens is great on film, but on digital it require a lot work.

Also: is any difference to use Voigtlander LTM to M ring or LEITZ original one?

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[Monochrome_Man]

And how it works on film:

Leica IIIa + Kodak Color Plus 200 + Canon 9000f

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[lct]

2 hours ago, Monochrome_Man said:

My 3€ for color cast corners... Lens: Voigtlander Color Scopar 21mm f4 LTM + M240

This lens is great on film, but on digital it require a lot work.

This issue of the CV 21/3.4 is well documented. Coding the lens as an Elmarit 21/2.8 may help. Otherwise the CV 21/3.5 is free from red edges on M and CL cameras.

[lct]

2 hours ago, lct said:

This issue of the CV 21/3.4 is well documented. Coding the lens as an Elmarit 21/2.8 may help. Otherwise the CV 21/3.5 is free from red edges on M and CL cameras.

I meant this issue of the CV 21/4 sorry.

[tom.w.bn]

I had this effect with my Elmarit M 28 / 2.8 when the lens detection sensor was dirty. Lens was not detected, all photos show this magenta effect on the side of the image. With proper lens detection, the effect is not visible.

[João Cardoso]

I know this is an old topic but just wanted to add a quick note. I got a Leica 21mm Elmarit 2.8 pre-asph and I was surprised to see a quite obvious magenta cast. I event though it was a problem with the lens because I dont see any of this issues with the Elmarit 28mm asph, the Voigtlander 35mm 1.4 Classic and not even with the very old Elmar 90mm f:4 on the Leica M 240. 

After some web search I found this post and was already pulling my hair just by considering to use Flat-Field correction on Lightroom. Having multiple test shots at different apertures on a clean white surface with a 21mm? 

Until I decided to try the manual selection of the lens profile on the M240. I selected the 21mm 2.8  (11134) and I got some nice results. Its probably not very noticeable, but if you take a close look will see the magenta cast on the right side of the first frame that is completly gone on the second one. Plus the Vignetting is slightly corrected too. So now I just have to remember to change the lens detection to manual when using the 21  

 

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[jaapv]

Or handcode the lens. 

[João Cardoso]

I need to see how that can be done. Thanks for the tip

[jaapv]

Use the DT method : a Sharpie.

 

 

[bocaburger]

5 hours ago, João Cardoso said:

I know this is an old topic but just wanted to add a quick note. I got a Leica 21mm Elmarit 2.8 pre-asph and I was surprised to see a quite obvious magenta cast. I event though it was a problem with the lens because I dont see any of this issues with the Elmarit 28mm asph, the Voigtlander 35mm 1.4 Classic and not even with the very old Elmar 90mm f:4 on the Leica M 240. 

After some web search I found this post and was already pulling my hair just by considering to use Flat-Field correction on Lightroom. Having multiple test shots at different apertures on a clean white surface with a 21mm? 

Until I decided to try the manual selection of the lens profile on the M240. I selected the 21mm 2.8  (11134)

I hand-coded (Dreml+Testor's flat model paint) my 11134 with satisfactory results.  That code apparently has aggressive correction as it significantl reduces casting on other offending lenses such as the CV 15 V1/V2 and 21/4 Color Skopar.  Just not completely though ☹️.  I ended up getting the V3 15mm and gave up on the 21/4 as I have the Elmarit.  Pity as those CV's were nice travel lenses given their tiny size.  FFWD several years and interestingly neither of those CV lenses has casting on my (stock) a7rii bodies (the least-expensive secondhand Sony ff with backlit sensor).  But they do smear in the corners at infinity even at smaller apertures so I still end up using my Elmarit 11134 and CV15-V3 which (at least on my 2 a7rii's and stopped down to my typical shooting apertures when corner sharpness is crucial to the shot) are at least as good as they are on my M240's.

[João Cardoso]

19 minutes ago, bocaburger said:

I hand-coded (Dreml+Testor's flat model paint) my 11134 with satisfactory results.  That code apparently has aggressive correction as it significantl reduces casting on other offending lenses such as the CV 15 V1/V2 and 21/4 Color Skopar.  Just not completely though ☹️.  I ended up getting the V3 15mm and gave up on the 21/4 as I have the Elmarit.  Pity as those CV's were nice travel lenses given their tiny size.  FFWD several years and interestingly neither of those CV lenses has casting on my (stock) a7rii bodies (the least-expensive secondhand Sony ff with backlit sensor).  But they do smear in the corners at infinity even at smaller apertures so I still end up using my Elmarit 11134 and CV15-V3 which (at least on my 2 a7rii's and stopped down to my typical shooting apertures when corner sharpness is crucial to the shot) are at least as good as they are on my M240's.

I think that for now I'll just manually change it. Its the first option of the menu s its a matter of not practice . For now I'm happy that at least I wont have to mask every single photograph and edit the magenta cast. I still need to properly test this on thye field but for now its promising.