I thought I would start up a post to share my experience in the new to me SLR world, maybe run some questions by the pro's and share my learning experience with you. I've been reading A LOT about SLR photography, reading about exposure time, aperture, metering, etc... My gear: Camera: Canon 400D (thanks Anthony!) Lens(es): Canon EFS 18-135mm f 3.5-5.6 IS So I played around for about an hour last night taking various pictures around the house and have a few questions. My goal in this series was to capture the writing on the guitar, in focus, super close up. For the picture below, metadata shows ISO: 400 Exposure: 1/15 sec Aperture: 5.6 Focal Length: 135mm Most of Fender is focused but towards the R and the Stratocaster is all blurry, dammit. [img width=640 height=480]http://lh5.ggpht.com/_qBa4ZQMbrrI/S5fg3yMKCyI/AAAAAAAABOw/SiNn7xfuAQw/s1152/IMG_7212.JPG[/img] I then tried a higher F-stop number as pictured below, camera in AV mode I think, ISO: 400 Exposure: 1/6 sec Aperture: 16.0 Focal Length: 135mm With this one it is all in focus but because of the higher Aperature I guess I didn't increase the Exposure enough to capture more light, right? [img width=640 height=480]http://lh3.ggpht.com/_qBa4ZQMbrrI/S5fg4ShSPSI/AAAAAAAABO0/7BEztpr6U9w/s1152/IMG_7236.JPG[/img] Here is the same aperature but with longer exposure, ISO: 400 Exposure: 1/3 sec Aperture: 16.0 Focal Length: 120mm This last one everything is in focus as I wanted but the color absolutely sucks. Would a longer exposure help? Higher ISO? [img width=640 height=480]http://lh4.ggpht.com/_qBa4ZQMbrrI/S5fg4pfCX8I/AAAAAAAABO4/q9gb_V_Vj34/s1152/IMG_7240.JPG[/img] I probably took 40 shots trying to figure how to do this, but sort of got it what I was looking for. Am I correct stating in a low light situation a higher ISO increases the brightness of a shot requiring a lower exposure? If so how do you know when a longer exposure is necessary versus a higher ISO? I've (think) read the higher the ISO the more grainy the shot will be in low light situations? The higher the f-stop number the greater the DOF? Meaning if the F-Stop is like 16 or so, things in the background will be in focus as well as your main subject. Compared to an F-Stop of like 3 where only the thing you are focusing on is in focus and everything else is blurred? And one more question my SLR buddy couldn't answer. The lens I got says f3.5-5.6 So do the numbers on the lens mean that at a minimum (or maximum in aperture speak) the camera lens will do f3.5? And on the flip side of that 5.6max? If so, what does changing the f value on the camera actually do if the lens is incapable of opening that much or that little? The camera allows you to choose both larger and smaller f value's, right? So what exactly is going on when I choose something like f16? Thanks and my apologies for butchering the practice... Feel free to tell me to shut up and keep shooting, all comments welcomed.