Is that a Chinon CE-3 Memotron that you use? I thought that the long-throw and rather stiff shutter release button tends to encourage vibrations.

There again I tend not to have too much vibraton problems with my ancient M42 lenses with even more ancient SLR bodies; the sometimes infuriating mirror pre-release on the old Dresden-made Contax cameras can be quite helpful even though you're practically shooting blind anyway. There again I had no problem hand-holding a 240/4.5 manual-diaphragm, metal-barrel Tele-Ennalyt which I had stupidly sold. Oh well.