i'm sure this question has been asked but, i'm too lazy search. do any of the dslr cameras have mirror lock up?? i really am thinking of purchasing a dslr by summertime and would like to use it for astrophotography. a mirror lockup would be extremely beneficial for sharp astrophotos. i really like the canon 10d but don't see any mention of mirror lock. i may have some canon ef lenses to go with the 10d so that is why i am interested in the 10d. does the nikon d100 have mirror lockup? anyone know if the manufacturers are thinking of this option in the future? thanx in advance!!!