FS: Rare, exotic and useful.
A Cook-Perkins focus checker. Unused in the box!
This is a machined aluminum tube (black crinkle finish and a tripod mount to the boot) with a removable ground glass in the back and LTM at the front. This is a small nifty device that is used for collimating LTM mount lenses. Yes, it has the same camera registry as a Leica screw mount camera.
Very few would have heard of it much less seen even a picture of it (will add a picture later). Rare is an understatement.
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