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I tried the 15X eyepieces in my stereo microscope:

http://www.greatscopes.com/achi.jpg

Which gave me 15x and 45x magnification. But, it wasn't an advantage. The most noticeable difference was...

My microscope is this:

http://www.greatscopes.com/achi.jpg

I've got the 10x eyepieces in now, which gives me 10x and 30x. I haven't tried the 15x eyepieces yet though, which would give 15x and...