20 inch f8 Chief Ed Jones designed and a 17 f9 Zanbuto Wide Band Chief Mike Jones designed .Both unobstructed telescopes .
-DannyMy warehouseMy Channel
Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
Quote: Hey Danny, on my pads, I don't let anything but water and compound, or a clean paper towel touch them. (to assure no scratches)
Quote: It sounds to me that you did not grind out the pits from the coarser grits. It will take less time to go back to 400 grit and regrind the surface from there back thru 5 micron then to continue to polish. It might take another 20 hours of polishing to remove the remaining pits and in that time you can have the mirror reground, fully polished and be well into final figuring. - Dave
Quote:Thanks for the info. However, I'm seeing fine pits with a laser pointer held at a 45 degree angle in the dark of my basement. The beam should go right through the surface of the glass if it is fully polished. Instead it reflects off of the micro pitting. It seems I have to go back to grinding.Peace, Bill
Mike Lockwood - Owner, Lockwood Custom Optics. 20" F/3 MX Starmaster, 14.5" F/2.55 self-built Newt., nine self-built scopes, 4.25" to 30" http://www.Loptics.com/
Quote:A laser is a good tool to judge polishing progress with, but it requires clean glass and practice.
"If I say something in the forest and my wife isn't there to hear it, am I still wrong?"
20" homebuilt truss dob 6" watson refractor
Jc ATM 10" F6.1, 1/25th wave spec (max wavefront error +/- 1/12.6 in zone 4 of 6, sodium light ), 6" F7 spec, 127mm F9.4 achro Refractor, Criterion DX8, 10 x 50 bin, SP mount/Synscan goto. ETX80 (finder) Canon 20D, PST DSI 1, Butenschön 125mm F13.4 refractor, diy spectroscope and curiosity