Hi Chuck,
The more I think about it, the more I feel you may be correct. I'm waiting
for Andrew to get the parts and see how it works. Even in my Leica IIIf, I
must be very careful not to scratch the sides of the rear element when
installing and removing the Jupiter 12.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Saturday, January 16, 2010 8:51 AM
Subject: Re: [OM] [OT] leica M 50mm lens wanted
> But, if the rear of the lens is only 6mm from the sensor it's also only
> 6mm from the 35mm film. I think the sensor being only 17.3 x 13mm
> should have an easier go of it than the 24 x 36mm film.
>
> Chuck Norcutt
>
>
> Jim Nichols wrote:
>> Moose,
>>
>> I have not seen a m4/3 camera, so I am doing a bit of guessing here.
>> From
>> what I can find in web searches, the registration distance for the m4/3
>> is
>> around 20mm. One Leica M to m4/3 adapter, when adjusted to achieve
>> infinity
>> focus, measured 8.57mm. A LTM to Leica M adapter should be 1.00mm.
>>
>> Assuming that all of the space from the sensor to the lens mounting
>> flange
>> on the camera is open space, then that provides 29.57mm from the Jupiter
>> 12
>> rear mounting flange to the sensor face.
>>
>> I just measured my J12 as best I could without marking the huge rear
>> element, and, at infinity focus, the rear element extends 23mm from the
>> back
>> of the mounting flange. That element is approximately 29mm in diameter
>> near
>> its rear extremity.
>>
>> This tells me there would be about 6mm clearance between the face of the
>> rear element and the sensor. If no other devices take up any of the
>> chamber
>> space, then, physically, it could probably be mounted. However, the exit
>> angles from that large rear element would seem to me to be too extreme to
>> provide a usable image, except perhaps as a fisheye.
>>
>> Jim Nichols
>> Tullahoma, TN USA
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