RE: [Leica] NEW Leica screw,,Really?

["Dan S" <dstate1@hotmail.com>]

I think you reversed my argument.  I know it is possible to use screw mount 
lenses on the newer cameras, I do so myself.  It is another matter to go the 
other way...A lens is designed to focus to infinity at a particular distance 
fromt film plane.  You can always use spacers to move the lens out a bit, as 
in the case of the LTM/M converter, but to go the other way would mean 
moving the lens elements CLOSER to the film plane.  This would mean 
re-designing the lens body to move the elements closer.

thanks,
dan



>Absolutely it will work. When they came out with the M's in 1954, it was
>designed exactly 1mm longer. That enabled them to market adapters so people
>could us their screw mount lenses on the new cameras. You can use old Leica
>screw mount lenses on these new cameras from Cosina.  You can even get an
>entire set of non-Leica screw mount adapters today for about $100 a set.
>That's how these new screw 21 & 28 lenses from Adorama work on both M and
>screw mount cameras. You may be surprised how many users of M cameras who
>use screw mounts will be interested in these new lenses. I'll probably go
>for the 50 Summicron myself.
>
>Greg
>-----Original Message-----
>From: dstate1@hotmail.com [mailto:dstate1@hotmail.com]
>Sent: Tuesday, August 10, 1999 1:12 PM
>To: leica-users@mejac.palo-alto.ca.us
>Subject: Re: [Leica] NEW Leica screw,,Really?
>
>
>Where did you get this information?  Was this from the company directly or
>through a distributor?
>
>Also, since the distance from the film plane to the lens is LONGER in the
>older screw mounts wouldn't this require a major redesign of the mounts on
>current M lenses?  This is not just a matter of slapping on an adaptor.  It
>seems unlikely that Leica would go through that much expense for what would
>seem like a small market.
>
>No offense but I'll believe this when I see it on the Leica web page.
>
>Dan
>
>
> >
> >If this was already announced, please disreguard my message:
> >
> >Leica is introducing three new SCREW MOUNT lenses. These are screw mount
> >versions of the M lenses in silver: (they say by late August)
> >
> >35f2.0 ASPH
> >50f1.4
> >50f2.0
> >
> >...and a new 35mm finder! Those tired old SBLOO's may finally get a 
>break!
> >
> >These will be made primarily for Japan, but we should be able to get some
> >according to Leica. Predictibly they will be in limited supply. Leica 
>says
> >this is in response to popularity of the "Bessa L" by Voigtlander, and
> >Minolta and Konica's SM lenses. Wow! Maybe we are seeing the begining of 
>a
> >"new" Leica here?
> >
> >I will not list prices as it is not Friday, but if anyone has a strong
> >interest feel free to call me at (212) 475-5660 any time today. I can 
>tell
> >you what I know and you may pre-reserve a lens.
> >
> >later,
> >Rich
>
>
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