I had a Yashica FX-3 Super 2000 and it was a bit clunky but it really didn't make a lot of difference. When hand holding I'm sure that your own shakes are worse than the mechanisms. The Yashica had a mirror pre fire when using the self timer for use on a tripod. The Yashica was a very basic and maybe slightly cheap looking camera but the 1.9 lens was very good and I could also fit my Zeiss 50mm f1.7 which really was good. At the moment I have a pentax MX which is very smooth as is my Canon AE-1 Program. My OM-1 is good too and has a mirror lock up facility. If you want sharp pictures use a good tripod and nothing will vibrate. The Manfrotto 055 with 029 head I have is certainly big enough for 35mm and medium format.

Dave