Or you can screw on a normal E39 filter on your Summicron 40. It only goes about a single turn or so, but that's tight enough to hold the filter in place.
The question was about the 40mm summicron C, wihich has a Series 5.5 39mm filter thread. This thread has a different pitch than the "normal" E39 filter thread.
Your M Rokkor uses normal 40,5 mm Filters (B+W, Heliophan, schneider Kreuznach are suppliers of this filters).
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