The best option is a EL or ELM to approach the vibration situation in Hasselblads. The weight and bulk of the motor/battery pack absorbs a great deal of the shock of mirror slap and thereby brings the Hasselblad question back on par with the Rolleiflex, which has practically nil vibration. But then, for me, the size and weight of an ELM is such that you question that if you're going to tote around that kind of bulk and weight, it may as well be a 4x5. But to be sure, and ELM is a very stable and very handy camera. After re-foaming mine, and bringing back up to snuff, mine trips off smooth as silk. Then I set it down and pick up my CM to compare, and it's like holding a little bomb when I trip it off, in comparison.