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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