Archived posting to the Leica Users Group, 2006/10/29

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Subject: [Leica] 6-bit code as installed by Leica
From: kididdoc at cox.net (Steve Barbour)
Date: Sun Oct 29 13:14:10 2006
References: <000c01c6fb70$cfb45a10$6401a8c0@FrankDell2> <m2slh7i0fq.fsf@whitefish.local> <24CBC4D90432C03E1CC06347@hindolveston.reid.org> <m2odrvhz5v.fsf@whitefish.local>

On Oct 29, 2006, at 9:20 AM, Dave Mason wrote:

>
> I am certainly not claiming that they are deceitful - or that the
> person who posted info earlier is - I just don't understand it. I
> would take the 6 bit/64 lenses idea if one of the lenses that they
> won't put the coding on wasn't an earlier (e.g., mid-1980s) Summicron
> 50. In terms of Exif data a "Summicron 50mm f/2.0" is a "Summicron
> 50mm f/2.0" is a "Summicron 50mm f/2.0".... isn't it?


  I have heard speculation that the coding might aid software  
correction for various lenses... don't know if this is true... but  
Leica ought to be clear about what it does and what it might  
eventually do...Steve


>
>
> Dave
>
> Brian Reid <reid@mejac.palo-alto.ca.us> writes:
>
>>> I'm just curious why Leica claims not
>>> to be able to put the coding on older lenses if its just to put a  
>>> text
>>> string in the EXIF data. It doesn't make any sense.
>>
>> I start with the assumption that Leica is not being deceitful.
>> You can call them a lot of things, but manipulative and deceitful  
>> is not one of them.
>> I have to assume that they have a reason to do this.
>>
>> Here's what I think. A 6-bit code can identify no more than 64  
>> different lenses. I'd be willing to bed that since the release of  
>> the M3 50 years ago, Leica has issued maybe 50 different kinds of  
>> lenses. If they were willing to put 6-bit codes on all of them,  
>> they'd only have room for a dozen new lenses and then the code  
>> would be full.
>>
>> So I think if I were them, I'd pick about 20 to 30 of the more  
>> modern lenses and assign them code numbers, and reserve the  
>> remaining 30 to 40 numbers for products that they haven't shipped  
>> yet.
>>
>>
>>
>> _______________________________________________
>> 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


Replies: Reply from hoppyman at bigpond.net.au (G Hopkinson) ([Leica] 6-bit code as installed by Leica)
Reply from luisripoll at telefonica.net (Luis Ripoll) ([Leica] 6-bit code as installed by Leica)
Reply from nathan at nathanfoto.com (Nathan Wajsman) ([Leica] 6-bit code as installed by Leica)
In reply to: Message from red735i at earthlink.net (Frank Filippone) ([Leica] 6-bit code as installed by Leica)
Message from leica at dmason.net (Dave Mason) ([Leica] 6-bit code as installed by Leica)
Message from reid at mejac.palo-alto.ca.us (Brian Reid) ([Leica] 6-bit code as installed by Leica)
Message from leica at dmason.net (Dave Mason) ([Leica] 6-bit code as installed by Leica)