Hey! I've recently bought my first manual SLR camera It was secondhanded, and I got a second body for free. It's a Pentax SF7 (SF10 in the US) and a Pentax ME. However, when I adjust the Diafragma filter on any of them, I can't see it in the viewfinder, and I see no way to preview this.. How is it possible to see with one of these? And which of these would be better to start out with as a beginner? Greetings, Chibs.