Hi, I have been taking 'snaps' on my 35mm canon AE1 manual camera for a long time now. Recently I dug DEEP into my student loan and have purchased a Canon 20D d-SLR plus a few lenses (EF-S 10-22, EF-S 17-85 IS, 70-200 F2.8 L IS and a 100mm f2.8 macro), and a 1.4x TC. I am definately not a pro - far from it. I just enjoy taking pictures of anything and everything. From macro to landscapes and more recently (thanks to digital) portraits. It is great checking how a picture came out of a persons face to make sure they didn't squint their eyes etc. Go digital! I have been reading people's comments on this site for about a month now and have learned many, many new things. However, the more new things I read about and learn, the more questions I seem to have. I could type out a whole list of questions but have decided to post just a few. It will be great if you can help with these: 1. I have often seen comments from people on this site who say that a lens will perform better on a crop framed camera (i.e. my 20D) because the crop framed camera uses the centre of the lens and therefore the pictures taken will not show up problems (primarily lack of sharpness) that often occur towards the edge of the lens. How true is this? For example if I shot with a 24-70 f2.8 L on my 20D at 50mm(31.25mm on my 20D) and 50mm on a FF camera (1dsmk2eos 5D) - would the picture be BETTER (in terms of sharpness etc.) on my 20D ? (I hope that question makes sense and isn't a silly question) 2. Before I ask the next question, I would just like to say that I don't want to turn this into a '24-70 L vs 24-105 L' question. As I have just spent the last hour reading opinions on the very issue. I often read people with much more knowledge about photography than me, making statements such as "the new 24-105 f4 L is much better optically at wide angles but poorer at the telephoto end" or vice versa. What I would like to know is, L lenses (for example 24-70 f2.8 or the new 24-105 f4) at their WORST (i.e wide angle + telephoto end) will they still be better than my current 17-85 EF-S IS?. If the answer is yes, then I can't wait to get my hands on one of them! Because my 17-85 is great but edge to edge sharpness is definately not amazing and so moving to a 24-70 or 24-105 would be fantastic. By the way, just to get my 2 pence worth in: I probably would go for the 24-105 F4 L because I do not require (as far as I know) fast shutter speeds indoor and the IS can counter the faster f2.8 of the 24-70 with its IS for indoor shots. I am assuming the quality DIFFERENCE between these 2 lenses is not going to be MAJOR - in which case - I am probably going to be happy with either. 3. I have just been shooting in JPEGS but will hopefully start using RAW and look to edit my pictures with the software that came with my 20D or perhaps PS. I also need to get a flashgun very soon. Do any of you helpful people know of any resources on the net that can help with me getting use to my 580EX or flashguns in general. I did the usual search on google but there were just too many hits. I need help with everything but flashguns is an area where I really don't know anything! I thought 'rear sync' was referring to the basin in the bathroom at the back of my student accomodation. Thank you very, very much.