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Re: [OM] Photos from Bessa

Subject: Re: [OM] Photos from Bessa
From: "Jim Nichols" <jhnichols@xxxxxxxxxxxxx>
Date: Thu, 22 Jan 2009 15:55:54 -0600
Wayne,

The thickness of the adapter does affect the point of contact between the 
lens cam and the rangefinder cam follower.  Therefore, if the adapter  is 
not the correct thickness, the RF image will not come together at the 
distance at which the lens is actually focused.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Wayne Harridge" <Sent: Thursday, January 22, 2009 3:29 PM
Subject: Re: [OM] Photos from Bessa


>
>
>
>
>> Stephan@xxxxxxxxxxxxxx <> wrote:
>>
>> the linking of the rangefinder... is fragile, since there are many
>> scopes of problems
>>
>> - need for an helicoid on the lens
>> - accuracy of the threadmount flange
>>
>
> Actually, I don't think the thickness of the M to thread adapter is really 
> critical. From what I understand the rf cam is part of the lens 
> construction and bears directly on the cam follower of the body, so the 
> adapter doesn't contain any rf linkage - correct ?  If the adapter is a 
> bit thinner than spec you won't be able to focus quite as close, you'll be 
> able to focus a bit past infinity and the distance scale on the lens will 
> not be accurate *but* the rf focussing should still be accurate.  Of 
> course if the adapter is a bit thicker than spec you won't be able to 
> focus to infinity (bummer !) but the rf will still be accurate at shorter 
> distances.
>
> ...Wayne
>
>
>
> Wayne Harridge
>
> http://lrh.structuregraphs.com
> -- 
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