I am looking for a supplier for achromat glass (about 4" to 8" in diameter). I am also looking for old and/or unmounted achro lenses of the same diameter. And if anyone out there has experience in building refractors of around 6" to 8", I would like to hear about your experiences. Thanks for any ones help, JohnD 8O
I am aware that Newport Glass Works lists achromat glass kits from 4" to 8" on their website. http://www.newportglass.com/angwcat.htm and scroll down the left menu until you reach achromat kits. I don't have any recent experience ordering from them.
I just completed a 10" achromat, and it came out great. The Bath interferometer says it's a Strehl 0.98 (about the limit for a doublet), 1/38 wave rms. I'm just having it AR coated now. So if I can give any moral support, let me know.
Before I found someone to safely AR coat it, I considered oiling it. So I've got a pretty complete set of Cargille optical coupling fluids. If you wish to oil yours, I can probably help there, too.