I frequently see people posting photos here that are fuzzy and totally useless because they don't have a macro setting for extreme closeups in their digital cameras. I found that if you hold a simple plano-convex or double-convex lens over the end of your camera's lens you can get some fairly good closeups.
most cameras do have a macro mode, even my cheap 90€ kodak does, most people simply don't know how to use it, no one bothers reading instructions these days...
The macro mode on a lot of digitals with low pixel resolution still aren't enough to show good enough details on posts here. Examples are pretty common on posts that ask: "What is this component?"
Use um if ya got um!...otherwise this is just another option.
I think most people in the 'what's this part?' posts are using there cell phones. Many don't know there's a certain distance the lens has to be away from the subject to focus.
And, where do you find a suitable macro lens to put in front of a cell phone?
Reading glasses! They do the same thing in front of your phone that they do in front of Grandpa's (read: MY) eyes. The stronger the glasses, the closer you can focus. My phone is razor-sharp at 1 foot with 2.25 glasses.