Feeling really self conscience about asking for help in the forum, but somehow I’m totally at a loss as to how I’m supposed to use the conoscope. I don’t have the glass sphere type, but the wider flatter turnable plastic type. I can’t figure out how to “focus” it. I can’t find anything remotely like an optic sign.
I guess it’s certainly possible that the light source to my cheap handheld polariscope is to blame, but are there any tips for using this infuriating little device? Thank you