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Re: [OM] Photos from Bessa

Subject: Re: [OM] Photos from Bessa
From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
Date: Fri, 23 Jan 2009 11:21:44 +0800
I also believe the adapter has nothing to do with the focus accuracy of the 
RF (also SLR). Consider if the adapter is 0.02mm thicker, the glasses with 
RF coupling mechanism will also move 0.02mm and you just need to focus 
closer so only the focusing scale is affected.

C.H.Ling

----- Original Message ----- 
From: "Jim Nichols"

> Wayne,
>
> I am not trying to be argumentive here.  I've used Leica rangefinders for
> more than 50 years.  True, the lens will focus, but the rangefinder does 
> not
> know where it will focus unless the distance between the LENS FLANGE  and
> the CAM FOLLOWER is correct.  An out of spec adapter will cause this
> distance to be incorrect. The proper adapter thickness is 1.00mm.
>
> One can compensate for an incorrect adapter by adjusting the cam follower,
> but it will be correct only for that lens/adapter combination, and will be
> incorrect with other lenses.
>
> Jim Nichols
> Tullahoma, TN USA
> ----- Original Message ----- 
> From: "Wayne Harridge" <Sent: Thursday, January 22, 2009 4:08 PM
> Subject: Re: [OM] Photos from Bessa
>
>
>>
>>
>>
>>
>>> Jim Nichols <> wrote:
>>>
>>> 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.
>>>
>>
>> Think about it, maybe draw a diagram - the focussing scale will be out 
>> but
>> the lens will still focus correctly !
>>
>> ...Wayne
>>

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