i just bought a 50mm f1.8 and am not sure about certain things, hope someone can help me here:
1. why is it that sometimes the aperture is at f2.8 ? how do i force it to be at f1.8 ?
2. why do we have to lock the ring at f22 before "P" and "S" can function?
3. the 50mm is a fixed lens, so how come it is not fixed at 50mm? i mean why can i still zoom in and out a tiny little bit?
apologise for the newbie question.... thanks....