2.) are cable releases compatible with all cameras? for example i would like to buy this: http://www.calumetphoto.com/item/BR5020/ does it work for view camera, hasselblad, and 35mm or all? 3.) was is the best method doing a self portrait with a manual camera? i googled and had some pretty varied stuff. i was thinking of focusing on the tripod while seated and returning it to the tripod.