Beginner & new to the forum,. I had an idea of shooting a long exposure night landscape of some interesting trees, with some foreground interest pond,river, etc. & Possibly lightening the tree just enough with a torch. Not an original idea I know but thought it would be fun to experiment, & learn. My question is how do you focus at night? Will there be enough light from the torch shone at the tree to focus? Also how would you calculate exposure time assuming not enough light for the camera to work it out. Is it just trial & error? Any tips on this type of photography would be great. Thanks.