Noob Magenta Question

[Allen B]

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Season Greetings All -

 

After many decades as a Nikon shooter, I recently picked up an M8 and have been enjoying it immensely, especially when I remember to take the lens cap off.

 

I have several lenses all with Leica ir filters but at high iso (1250 ->), under artificial light, there still is a marked magenta cast to black synthetic fabrics with each of the lenses.

 

Before I send the camera off to Leica, can someone tell me if this is normal? Do I expect too much? I don't find any information about this searching any of the Leica sites.

 

Thanks in advance.

 

Allen

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[adan]

Shooting jpegs or RAW? Which program do you use for developing dngs? Have you made a dedicated calibration profile for the M8 under tungsten light? How are you white-balancing? Got an example image?

 

My experience with the M8 was that with .dngs and a good tungsten profile and correct WB, there was no remaining magenta cast.

[pop]

Are your lenses coded? Did you set lens recognition to "coded with filter"?

[WestMichigan]

Great Questions Guys!

I eagerly await the OP's answers so I can learn more myself!

Are your lenses coded? Did you set lens recognition to "coded with filter"?

[ho_co]

Allen, welcome to the forum!

 

A couple more questions: What kind of artificial lighting--tungsten, halogen, flourescent? How is white balance set? What firmware version?

 

Also: You say the lenses have "Leica ir filters." I'm sure you're referring to the dichroic Leica UV/IR-Cut filters, right?

 

 

Can you post an example?

 

M8 with the proper filter on a coded lens with both code recognition and UV/IR correction turned on shouldn't produce magenta tones in synthetic materials in normal lighting situations in my experience. However, screw-in tungsten bulbs are very rich in IR, so there may be something else at work.

[Allen B]

Thanks all for your quick replies.

 

adan - I shoot only raw and process in Lightroom 3. I do not have any kind of 'custom profile' and use only auto or one of the internal white balance settings.

 

pop - The lenses are all coded and the camera is set to recognize them.

 

ho_co - I first notices it with lights at home and I can't remember at the moment but I think that they are halogen. Unfortunately, I'm not at home so I can't check or post anything until after the holidays. There have been other instances, always under artificial light in some stores in my neighborhood. I'll see if I can figure out what kind of lighting that they use. The filters are, in fact, Leica UV/IR filters.

 

Thanks again.

 

Allen

[ho_co]

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Allen, it's an interesting question because at least in my experience, it's unusual.

 

From what you say, you're doing everything right.

 

Are you running into the magenta generally, or only on specific materials?

 

Interesting that you see it primarily at high ISO. Could the images that show it be generally underexposed?

 

Keep us posted, and happy holidays!