Views on Yashica TLR auxiliary lens sets?

David H. Bebbington said:

Anyone used a wide or telephoto Yashica TLR auxiliary lens set? (Fits onto bayonet mount like a filter). I never have - I would assume definition at large apertures is not too hot, but is it possible to get a worthwhile result even stopped down? All info gratefully received!

Had set of both, for a collector OK, otherwise not wroth the money, get a Mamyia.

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