You're right, I just measured an FM at ~46.53 and an ME at ~45.5.
Silly me had assumed that the M42 to Nikon adapter allowed infinity
focus with M42 lenses.
It only focuses out to about 8 feet! ;-(
I've had the adapter for over a year and just now realised it
doesn't work.
This DOES however make adapting Nikon lenses to K bodies a
possibility. With a little "Cottying", of course. ;-)

Anyone know the register on Canon and Minolta bodies???
<vvbg>

Don 

> -----Original Message-----
> From: Adam Maas [mailto:[EMAIL PROTECTED]
> Sent: Saturday, December 31, 2005 10:29 AM
> To: [email protected]
> Subject: Re: Nikon lens on M42 body???????
> 
> 
> Register for the Nikon mount is IIRC 1mm longer than M42 (46.5mm vs 
> 45.5mm), but there's no way this adaptor maintains infinity focus, it's 
> way too thick.
> 
> -Adam
> 
> 
> Don Sanderson wrote:
> 
> >http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7575287348
> >
> >Anyone see how this could possibly focus to infinity on an M42 body?
> >Seems to me the register distance is already 'shorter' on Nikon lenses.
> >My Nikon body to M42 lens adapter spaces the lens about 3-4mm
> >farther out from the body, it seems the one above would act as an
> >extension tube as well as an adapter. 
> >I'll probably buy one anyway 'cause of the 'wierdness factor' but I
> >don't see how it could actually work. ;-)
> >
> >Don
> >  
> >
> 

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