Thanks for your reply, Chuck. I've requested a catalog from Antares. They don't seem to have a website. Bob Grant ----- Original Message ----- From: "Chuck Hards" <chuckhards@yahoo.com> To: <utah-astronomy@mailman.xmission.com> Sent: Tuesday, January 14, 2003 8:53 AM Subject: Re: [Utah-astronomy] Sources for Refractor Objectives
Bob, try also ANTARES, out of Vancouver, IIRC. They have ads in the back of the magazines. They carry the Vixen line of objectives, in both "Research Grade" and "Commercial Grade".
I have purchased 2 Vixen objectives, found them both to be excellent.
I have also purchased many objectives from Apogee, but the quality has varied. I think they have multiple sources, which might explain the inconsistency. Some have been excellent, some only fair. Kind of a crapshoot.
You are correct in assuming that, with doublets, the longer the focal ratio, the less apparent the spurious color is.
Folded refractors are a great convenience. Use the highest-reflectivity mirrors available to mitigate throughput loss.
Chuck
--- Marilyn Smith <bob-marilyn@worldnet.att.net> wrote:
After re-reading a few articles in S&T about folded long F.L. refractors, I'm toying with the idea of making one. Apogee lists a 90x1000 objective for $85, but they are out of stock until March. I'm leaning toward this 90 mm lens because I have a lens cell that I think will work, but my understanding is that a longer F.L. would have less color.. The only other source of objectives I have found is Surplus Shed, but their website doesn't list anything within a couple of inches larger or smaller. Does anyone know of other sources for objectives between 80 and 100 mm? Has anybody built a folded refractor? What kind of quality can I expect from Apogee lenses?
Bob Grant
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