I have been studying and I am learning quite a bit (still don't have my camera yet-but in no hurry) I know some of this will come to me when I finally do start really taking shots - I understand the f-stop or aperture for allowing light, and also for depth of field- but when you go shopping for lenses they may say 2.8-5.8 (or something there abouts) what is that telling me? Is that the only stops I will be able to use even though the camera itself will have more of a range? I am probably waaaaay off here. Help me out a little. Thanks in advance.