Stereo Microscope Parfocalness

[KL27x]

TLDR, the parfocus of a stereomicroscope is adjustable with the eyepieces.

So, I figured this out after my GF used my microscope. Afterwards, I offered her a refresher course. It took me several seconds to figure out why I could not, uh,, see for $%%. One eyepiece was screwed all the way out. I know she's not blind in one eye. She later confirmed how she used the scope by looking at me and closing one eye, lol.

Anyhow after refocusing it, I realized it lost parfocus. After a minute of fiddling, I found you have to set the eyepieces more or less exactly at the halfway point for the thing to have parfocus. So it looks like Amscope got the thing quite parfocused from the factory.

So much for microscope theory that cheap microscopes won't be parfocal. It's an adjustment. Not a quality issue. LOL.