Do Summars vignette with color films ?

This was more of an issue with color slide film which had much less latitude than modern color film.

And it is in Morgan and Lester, under the Summitar write-up.
 
Wide open, with high-contrast film like slide film, you'll surely notice vignetting. It also is a little less color-corrected than the Summitar (chromatic aberration).

But, at f/4 and smaller, it's plenty fine. Just view the first two stops as "emergency."
 
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