Hi, I have recently joined the world of digital photography and bought a k10d and a few lenses, one of which is a to kinda sz820 80-200mm manual lense, now I don't have a manual for my camera so I'm learning on the go . When I attach the lense the F just flashes on my LCD screen and in the eye piece and I can't take any photos, what do I have to do to make it work properly. I'm sorry if I sound a bit stupid but this is my first dslr after using a Fuji bridge camera, many thanks.