craygc
Well-known
With obviously more time on my hand than I know what to do with I knocked up this image around some thinking I have had lately. Especially with more mirrorless interchangeable lens cameras becoming available. But not having seen an adapter to know whether all the bits would fit just looking for thoughts - is one of these things possible ???
xxloverxx
Shoot.
Probably possible but you'd have to rethink the lens mount — there's only a certain amount of space you can have between sensor and lens before the lense won't be able to focus at ∞.
Nice concept though.
Nice concept though.
Dwig
Well-known
As designed, it can't work. At least if maintaining infinity focus is a requirement. The big issue is the size of the adapter's cam follower.
The focus cam on an M lens extends roughly 7mm from the rear face of the lens flange. Given that at infinity the second close-range cam on the DR-Summicron extend roughly 11mm from the rear face of the flange and doesn't clear the restrictions in the m4/3rd mount, you have something less than 3mm for the total thickness (diameter if using a rotating sleeve on the follower), front to back, of the RF cam follower. In practice you probably only have about 1-1.5mm to work with and snaking the linkage out will be difficult as the register distance between the two mounts is only slightly greater than 8mm and the diameters of the two mounts are very similar.
In addition, mounting would be difficult as the attachment, as designed, can't rotate to mount and unmount unless it is completely in front of the camera. This would place the eyepiece in an unusable position too far from the eye. It would have to be a two piece affair with the adapter and a removable RF unit or it would have to have a rotating bayonet flange on the rear.
The focus cam on an M lens extends roughly 7mm from the rear face of the lens flange. Given that at infinity the second close-range cam on the DR-Summicron extend roughly 11mm from the rear face of the flange and doesn't clear the restrictions in the m4/3rd mount, you have something less than 3mm for the total thickness (diameter if using a rotating sleeve on the follower), front to back, of the RF cam follower. In practice you probably only have about 1-1.5mm to work with and snaking the linkage out will be difficult as the register distance between the two mounts is only slightly greater than 8mm and the diameters of the two mounts are very similar.
In addition, mounting would be difficult as the attachment, as designed, can't rotate to mount and unmount unless it is completely in front of the camera. This would place the eyepiece in an unusable position too far from the eye. It would have to be a two piece affair with the adapter and a removable RF unit or it would have to have a rotating bayonet flange on the rear.
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