M9+Zeiss Biogon ZM 21mm

[peera1197]

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Need help. Zeiss Biogon ZM 21mm with bayonet 50/75 frameline, is it work with manual lens selecton for 21mm 2.8 Asph on M9 or not? I have ever known it need to change bayonet to 28/90 frameline for coding in M8.

Thanks,

peera

[akiralx]

The framelines are mechanically set from the lens bayonet, and are unconnected with the lens coding. I believe Zeiss can supply this lens with a bayonet which will give you the 28/90 frameline.

[kanzlr]

for a 21mm lens I'd get an add-on viewfinder anyways.

[lars_bergquist]

Yes, but if you want to permanently code the lens as an Elmarit, the position of the frame line lever must be right (in most cases). Zeiss will deliver the lens with 28+90 bayonet instead of the regular 50+75 however, so just ask your dealer for it.

 

When you have made sure that the lens focus etc. is right, you can pull the bayonet, or have a camera mechanic do it, and send it for permanent milling of the pits to take the paint. I would never trust the iffy felt pen coding.

 

The old man from the Age of the Enigma Codes

[01af]

Need help. Zeiss Biogon 21mm ZM with bayonet 50/75 frameline, will it work with manual lens selecton for 21 mm 2.8 Asph on M9 or not?

Yes, it will. If you manually select a lens from the menu (either Elmarit-M 21 mm or Elmarit-M 21 mm Asph) then it doesn't matter which framelines actually are selected. In any case, the LensType tag in the Maker Notes section of the EXIF data will be "1 1" (for Elmarit-M 21 mm) or "24 1" (for Elmarit-M 21 mm Asph). Here, the first number is the 6-bit lens code; the second is the 2-bit frameline code which will always be 1 (for 28/90 framelines) no matter which framelines really are selected.

 

If you want to apply the 6-bit code patches to the lens' bayonet mount for automatic lens recognition then you must also change the bayonet to bring up the 28/90 framelines. For manual lens selection, this is not required.

[jaapv]

The corrections for the Elmarit (non-asph) work best.

[Guest]

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Could you please tell me who in Germany could 6-bit code a new (not yet bought) 4.5/21mm Biogon for a M8 and what I need to pay attention to?

Many thanks!

[lars_bergquist]

It seems that there is no coding available that will produce acceptable results. Leica did after all never produce anything like that lens -- unfortunately. Now, if I am wrong, please correct me.

 

The old man from the Age of the Contax Biogon

[Guest]

Just looking for someone in Germany or the EU, who could 6-bit code an pre-Asph Elmarit code onto an Biogon 4.5/21mm. Glad to buy the lens in black from that source as well.

 

Or is the back lens closer to the chip than on the 2.8/21mm Biogon? I only thing of using it on my M8 anyway, so the corners are less critical than on an M9.

Remember reading that an bayonet mount attachment screw of the 4.5/21 is exactly where a black dot would be, but this is too speculative for me. I'd rather have the address of someone competent to do it properly.

[lars_bergquist]

I did not say that the lens cannot be coded any which way you like. I simply stated that to my knowledge, no extant code gives good results with this lens. Compatibility, as far as I understand, is decided primarily by the position of the exit pupil, and the lens speed, not only or even primarily by the focal length.

 

The old man again