Archived posting to the Leica Users Group, 1996/04/11

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Subject: Re: M lenses for 120 format Mamiya 645
From: Tom Hodge <>
Date: Thu, 11 Apr 1996 18:59:18 -0400 (EDT)


Given the film plane to rear element distances of these vastly different 
systems......I can't see how this "adaptation" can occur.

I simply tried to hold an M lens in place over the gaping opening of a 
Mamiya 645 body to see if there was a shred of focus......not a bit!  
Whether focused on infinity or the closest distance.....nada.  Zip.

Of course if I want to rip the reflex mirror out, there is a ray of hope 
as the tiny M lens would be required, essentially, to mount INSIDE the 
645 body.

I then tried it with a reflex lens instead of a rangefinder lens - 
thinking the similar longer distances of a 35mm SLR lens might be a 
better match.  Again, not a whole lot to call anywhere near focused.

What's going on here?  Is someone pulling our collective legs?  My doubts 
will be impossible to erase until I fit an M lens on >MY< Mamiya 645!  
(Sounds like the posting of this amazing discovery is about 10 days 
late)  :):)

Rgds to all,

Tom Hodge

In reply to: Message from (TK Chan) (M lens for 645 format)