rdeloe Offline Upload & Sell: Off
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naturephoto1 wrote:
This may sound a little off the wall, regarding the Sweebo TC24, but I have a rather rare Leitz 2 part adapter #500935 that was included with my Leitz 25mm f2.5 Photar macro lens to attach the lens to my Leica R bellows. The outer removable portion of the inner ring is 40.5mm. The other inner portion of this adapter has an microscope RMS thread to mount the photar to the outer portion of this adapter. I also have a rather heavy custom made adapter ring that was made to mount my Rodenstock 75mm 1X and 2X Apo Radagon D lenses into a Copal shutter. As it turns out it has the same 40.5mm thread size that screws into the Leitz adapter (which has a Leica R mount). The other side of this custom made adapter is M39 size (same as all of my Apo Enlarger lenses) and also the thread size of the Sweebo TC24 lens.
Since the Sweebo TC24 lens appears to have the helicoid focus and the Cambo Actus Mini foucses via a bellows, with the possible exceptions of added vibration and not being kept perpendicular to the lens board, do you see any problems mounting the lens into the outer portion of the #500935 Leitz adapter and the special custom made adapter ring providing I can still focus the lens at infinity with the focus of the lens itself?
The reason that I am asking and suggesting this as a possiblity is because I believe that I could then mount the lens this way to my Cambo modified Leica R lens plate and mounted this way it would not interfere with releasing the lens from the Leica R plate. Don't forget the Sony camera bodies have an 18mm flange distance while the Leica R flange distance is 47mm. An advantage for me to do this is that I could carry the Sweebo LS24 unattached to a Lens plate and only attach it when needed; this would take up less of the precious space in my small backpack.
Rich...Show more →
Rich, if you can get the lens at its flange distance, you're (mostly) good to go.
The "mostly" is because in getting it at its flange distance, it needs to be securely held and properly aligned; you need to be able to reach the aperture ring and focus ring; and you don't want anything in the light path at the rear end that can cause reflections.
If you can check all those boxes, any number of solutions could work. If the one you've mapped out here doesn't work, you have lots of other options. For example, the 39mm threaded rear end of the lens will fit through a Copal 1 hole, which is 41.6mm. That's a bit loose, but you could easily lock it down temporarily with a spacer and a short 39mm x 1/26th inch thread extension tube (assuming that's the pitch on the lens). If the Cambo board is recessed enough, you'd be good to go.
This is a re-housed Fujinon GX 65mm f/5.6 on my Toyo. To mount this one, I had to make a bellows adapter to attach the bellows to the rear end of the lens, instead of to the front standard. There are no rules.

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