As you can tell, or guess, I'm new to the photography world and purchased my Nikon D40 about five months ago. I was interested in getting a Nikon 50mm F/1.8 AI S and purchased one on ebay for a good price (or so I thought, at the time). Without realizing, after I won the bid, I realized I didn't know what an AI S was and thought they were all the same, after trying to research it, i realized that AI S meant it was a not auto-focus but manual. I also bought the book "Digital SLR Cameras & Photography for Dummies" but can't seem to find the answer to my question in the book. My question is, after realizing that this particular lens will fit on my D40 BUT does not have a Meter (I found this on the Nikon Lens Compatibility link), will I still be able to take pictures without using a meter? I'm not exactly sure what the meter does other than calcuate the size or focal range of an object. (At least this is what I think). I'm planning on taking some photography classes after I graduate college in the spring. I cannot retrack this bid because it was my stupidity and not the sellers so it's not fair to him on behalf of my ignorance. I wanted to experiment on the object and the blurriness behind objects...so would I still be able to do that by using a manual lens with no meter? Thanks!