Magenta Sides with 21mm's on M8

[Nicoleica]

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This may be a daft question, and my apologies if it is, but have you got the latest firmware in your M8? This may make a difference if you are running on an early version.

[pklein]

I know this is going to sound a little crazy, but hear me out. Magenta corners means that the camera is over-correcting for the cyan corners that a wide-angle lens will generate on the M8 if the camera doesn't compensate.

 

So, if the camera is over-correcting, what will reduce the correction? Code the lens as a shorter focal length. Try coding it as one of the 24 or 28mm lenses and see if that helps.

 

Another possibility: What frame lines does the Zeiss lens bring up, and what frame lines would the Leica lens it's coded as bring up? Don't those have to match in order for coding to work properly? There is no "correct" M8 frame line for a 21mm lens. But if Zeiss and Leica didn't make the same choice, then the camera might not be seeing the right set of conditions, and as the good old programmer's disclaimer goes, "unpredictable results may occur."

 

--Peter

[jaapv]

Thanks to all for the well-considered opinions.

 

For clarification sake my ZM21 is fitted with a Leica brand UV/IR filter (13418)

Menu setting was,and still is, set to "Lens Detection On + UV/IR"

 

Thinking I had found the Holy Grail late last night in another thread, here:

 

Leica M Lens Codes

 

I recoded my ZM21 as an Elmarit 21 asph, this morning but unfortunately found the results

pretty much on par as when the lens was coded as the non-asph version of the 21.

 

I guess it is just something I'm going to have to live with (or not) and resolve to build a generic action

to deal with it in post.

 

Not the end of the world, by any stretch, given the real problems out there but

disappointing nonetheless especially since I had based a lot of this decision to buy into

the M8 three years 'late' on a series of tests that I had done about a year ago with my dealers

demo M8 and his non asph 21 which has absolutely ZERO magenta/red cast.

 

Looking at these clean files in front of me now is a cruel taunt :>))

 

 

Thanks again to all.

Best,

Mark

 

Mark Tomalty Photography Montreal Canada Travel Landscape Stock FineArt

 

P.S.-Got your tongue-in-cheek intent, Gregory. Thx

Another stupid question: is the lens recognized in EXIF?

[mtomalty]

Yes.

 

The lens is recognized in the EXIF.

Thx jaap

[jaapv]

I went through my Biogon shots and did not see the problem there, but I must confess there were no real high-IR situations. I must chase the thing up and try this out.

[Eisemann]

The mount on the Zeiss 21 must be adapted or changed to bring up the 28mm M8 Frameline. The UVIR filter and coding is not enough. Alternatively, you can select the 90/28 Framelines with the frameliine selector at the same tine that you activate the shutter. This is a bit of a finger exercise but will suffice.