This is my setup, a K3-II married to a Sigma 150-500 f/6.7 (I think), on a pretty heavy Manfrotto tripod. I use an electronic cable release giving me programmable interval shooting (which is very useful for stacking images later) but I'm not sure if I can lock the mirror up prior to taking a shot using the cable release. I'll have to fiddle with that. I also read (here, I think) a trick to make the tripod more stable by hanging a bucket from the head with a few bricks in it. I'll see if that is possible.
...and Uppsala, an old friend of mine (best man at our wedding 30 years ago) is a professor at the University there (he actually lives in Marielund). We lived in Bergen in Norway for three years and only got to visit him once - he tends to come down here a couple of times per year. But Uppsala is wonderful.