Quote:
Originally Posted by legswilly
Thank you for replying Stephen. Have already bought some glass and will try to epoxy together. I also want to build a auto collimation test stand and needed a flat mirror for it. Could not find one to buy, so will make one. Still need to go to Sydney to pick up the glass which is waiting for me.
Found a Ronchi eyepiece maker https://www.gerdneumann.net/english/...lar-5l-mm.html. He makes a 10lines per mm, which equates to 254 lines per inch. Is 254 lines too many? It's a lot cheaper. |
254 lines per inch should be ok. I use a 133 lpi eyepiece and it also works well for testing the whole system using an actual star. At 254 lpi sensitivity to optical defects should be higher. Shouldn't be any negative diffraction issues.
Stephen.