Originally posted by Anvh Something don't add up, you talk about 1/2 second that vibration might exist but the delay is 2 seconds before it takes an exposur more then enough time for any vibration to roll off according to your own words.
So... against what are you arguing?
The 1/2s is just a medium length of time. The time for vibration dying out is different for any combination of tripod legs, head and camera kit on top. It can be anything... And in all honesty, the 2s delay of the Pentax DSLRs is too short, when using long lenses. I always preferred the old method of simply fixing the mirror in its upward position (MLU), as the LX or several Nikons offered. That is the best solution, in my eyes at least.
By the way, I am not argueing against you or anything you wrote, I am just emphasizing, that the approach Pentax nowadays offers is short of what would be very useful for long exposures.
Another point is wind. Even if wind is nothing nowhere near a storm, which would topple over a tripod (I have had that, even with a heavy tripod), it will introduce vibration. This induced vibration can of course not be eleminated bei shutter delay or the "hat trick". It can only be minimized by a very solid tripod/head-combination and a nicely balanced camera on top (to counter excessive torque).
Ben