Thank you very much to all of you! I did the thing indicated by Dan Daniel. The Jupiter 12 works correctly. Next weekend I'll use it with Ilford film. I will show the results.
Canonet QL19 New (1971) - Kodak 35 (1941) - Beirette Junior (1959) - Olympus FT - Walzflex 500 (1959) - Rolleiflex T (1959) - Canon 7 - Canon XSI 18-55 & 70-300