I don't think a microscope is a good alternative to a camera just a good addition to one if you are looking for specific things on certain coins. I have a digital blue QX-5 and it works pretty good but will not focus on a whole coin (unless its a small ancient or a US 3 cent silver coin). I have a old (I have had it atleast 9 years myself) JVC 3.2 MP camera that I use to take my coin pictures with, its just a point and shoot camera no special lenses or anything and it works well when macro is turned on for coins. You can get some with allot more addons than this one that look allot better but I have also gotten a 8MP P&S and the 3.2 just does a better hob in my opinion (maybe because I haven't messed with the other one much to learn it). I paid like 20 bucks for the camera off of
ebay when I bought it and if I was looking for something to take a picture of a coin with I would look for something like this, it will show the coin very well and you can also get pretty close to the coin to show details you are trying to point out. I don't know what type of camera you have now but I bet it has a macro setting on it and if you are not using it you may want to try it and see what type of pictures it takes with macro on, Macro will allow it to take closer pics and usually will auto focus to get a clear picture also. If you will tell us what type of camera and model number we can see how to set it up better (if you don't know how to use macro) the macro setting is usually a button or something with a flower icon on it to turn on the macro setting and then you can zoom in or out to get the part you desire shown in the picture. on mine I half press the shutter button and it will focus and then beep when focused and then I just push it all the way in to take the picture. you may only need a table tripod also (also pretty cheap) to keep the camera more stable which will also account for allot of blurry pictures