SquareHood - Summicron-C 40mm Adapter Ring

Took a gamble on this because no one else makes this thread pitch, and it threads on perfectly smooth with zero play. Finally my 40mm Summicron-C sits flush without wobble.

Finally, an adapter that actually fits the oddball 0.70mm pitch on this lens. The threading is precise and smooth, no wobble at all when mounting a filter. It’s a relief to have a solid solution for this obscure setup.

I gave up finding a .70mm pitch adapter until this one showed up. Threads on cleanly and the filter sits flush — no wobble, no cross-threading like the .75mm ones I tried.