[Leica] M8 question #2: Barcoding lenses

[henningw at archiphoto.com (Henning Wulff)]

At 8:57 AM +1000 11/24/08, Geoff Hopkinson wrote:
>Ken, there are several considerations.
>The EXIF information which is not a priority for you.
>Some additional flash functions, which are generally not thought important.
>A correction by the firmware of vignetting. This is tailored to specific
>focal lengths. Leica recommends that is only significant from the 35 to
>wider.
>Use with the UV/IR filters. The M8 will allow you to select Lens detection
>OFF, ON or ON with UV/IR.
>The UV/IR on wides introduces cyan corners which are also corrected by the
>firmware, if it knows what lens is fitted, so it is very convenient to have
>the 6 BIT coding when you use the recommended UV/IR filters.


I have some coded lenses and some uncoded. I 
leave the menu On with UV/IR. I have not had any 
errors.

I have the 15/4.5 CV, 21/4 CV, WATE, 21 ASPH, 
28/2, Tri-Elmar and Noctilux coded. The last only 
got coded because I had sent in the lens with a 
camera to adjusted correctly, and I though I 
might as well have it coded while it was on 
vacation.

Uncoded lenses include my 35's, other 50's, 75's, 
90 and 135's. All work fine with the menu set to 
ON. I might send in the 35's at some point, as 
the cyan shift is _just_ detectable in some 
shots, but I'm not sure I want to be without the 
lenses for any length of time.



>In summary, for colour, get the 6 BIT coding for your 35 and wider first. If
>you would like the convenience of not changing menu settings with different
>lenses, you can get it on the 50 and longer as you want. Its not needed for
>vignette correction there, however lens detection ON for un-coded lenses can
>cause errors.
>The 135 is not codeable because Leica does not recommend it for the M8 due
>to the size of the FoV in the M8 finder and associated imprecision in
>focussing. Its not impossible to use, I tried it when Tina showed and it
>worked perfectly with my M8.
>Regarding the M Coder that Lluis has provided a link for, some people swear
>by them and some swear at them. I am of the latter camp. I found the coding
>from mine unreliable and frustrating.
>If you have non-Leica M lenses, consider John Milich's service to machine
>the coding pits into the lens flanges or adaptors.
>
>
>Cheers
>Geoff
>http://www.pbase.com/hoppyman/e
>http://gallery.leica-users.org/v/gh/
>Pick up your camera and make the best photo you can.
>
>-----Original Message-----
>Subject: Re: [Leica] M8 question #2: Barcoding lenses
>
>Ken,
>
>Look at this, it seems an interesting accessory:
>
>http://www.robertwhite.co.uk/product.asp?P_ID=2013&PT_ID=359
>
>Saludos cordiales
>Lluis
>
>El 23/11/2008, a las 21:34, Ken Lassiter escribi?:
>
>>  As I begin shopping for my M8.2, I realize that I must have my M
>>  lenses barcoded.  I gather that it is required for the best
>>  performance of wide lenses such as the 21mm ASPH, 28mm and 35mm
>>  Summicrons. What about for longer lenses such as 50mm Summicron and
>>  90mm Elmarit?  Last, what about the Noctilux?  Which lenses are
>>  important to have barcoded?  At $175 each, I need to set priorities
>>  for which lenses I have coded first and know if it might be a luxury
>>  for some others. I see that Tina sometimes uses a 135mm lens on her
>>  M8 and no barcoding is available for that lens.
>>  My main concern is optical performance not just recording which lens
>>  was used for a particular photo.
>>
>>  All advice offered will be highly appreciated.
>>
>>  Many thanks... Ken Lassiter, Boynton Beach, FL
>>
>>  _______________________________________________
>>  Leica Users Group.
>>  See http://leica-users.org/mailman/listinfo/lug for more information
>
>
>
>_______________________________________________
>Leica Users Group.
>See http://leica-users.org/mailman/listinfo/lug for more information
>
>
>
>
>_______________________________________________
>Leica Users Group.
>See http://leica-users.org/mailman/listinfo/lug for more information

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