Hello all, How does spacing affect the spherical correction of a Fraunhofer achromat? I have one which had a 1mm plastic spacer ring which got broken and could...
I see on OPT's web site that the Pentax refractor is kaput. I really wanted one of these five inch $7k jewels but ended up settling for an FS128 instead, in a...
... Greg, the Pentax line was discontinued last fall or winter at the latest, and vendors were running on NOS even then. Who killed the line? All the people...
Are they as well corrected as AP or TEC refractors? They seem to be touted as photographic instruments with large flat fields but how would they do on the...
I don't know anyone who is doing serious planet photography in a 5" or smaller refractor. Last time we went around on a similar topic Roland posted a very...
... But, but, Greg, Clunky ol' SCT's? Don't you have "sct" in your user-name? And don't you run one of the biggest SCT groups out there? I'm way confused....
... Not at all Greg. Two diametrically opposite markets there. Just not enough people pulled from the other premium competitor markets like A-P, LZOS, Tak,...
Bud: that's what I think about Pentax too, that they don't take a back seat to anyone, but among the binocular bird crowd, Pentax and the Japanese makes...
In my heart of hearts I don't think the amateur astronomy market looks "interesting" to whatever interests currently own Pentax. I think they like their...
I wonder why Canon doesn't make telescopes. There are people there interested in astronomy, they were the only ones making a camera dedicated to amateur...
... Two great well-known people in their related areas, but why would those two people in particular persuade you finally? Roland is just about the highest...
How about Royal Astro Optical in Japan. What happened to this company who used to make excellent achromatic refractors back in the 50s and 60s? Clear Skies, ...
... The Jena Telemators existed because the E German government decided to put a telescope in every primary school in the county. I thought about getting one...
Bud, you are a refractor buff, so it makes sense that you would buy refractors because of their quality aperture. I volunteered information on something...
I dunno. There seems to be an optics community in Japan that runs around doing telescopes, cameras, industrial optics, what have you: kind of an optical...
... Hi Greg, thanks for the explanation. What you say makes a lot of sense. I'm a refractor buff, yes, but I'm also (and more to the point) a /telescope/...
... Such stores carry merchandise based on what they think their customers are interested in and can afford. Walmart doesn't think their customers likely to...
Well, I mean, they could afford to stock a few Tak FS102s. You know, in case someone just dropped in with a hankerin' for a fluorite. Just one or two per...
... Walmart knows that customers would literally walk out the door with them, unpaid, like they do so many TV's. Then bring them back without a receipt and get...
Looking for a 6" achromat of "above average??" quality and I tried out the Celestron 6" f8 last week With a WO VR1 minus violet filter it performed admirably...
... George, none of the one's you mentioned are, IMHO, "above average." They ARE the average. If you want an achromat of superior quality for a very...
Thanks for the advice, Buddy. I'll do that!. After my Club's public viewing at a nearby park, where I operated a "very nice" Celestron 6" f8, I got the...
Celestron and Skywatcher are the same. The Meade is not, but is optically near identical. Take your choice. I own the C6R myself, and wouldn't dream of letting...
... If you liked the views in a Chinese f/8, you will love the American Made D&G, low, medium and high power. And a much better made lens. Is it worth...
Hey George, D&G Optical makes very specialized refractors. I don't think a achromatic refractor with an FR of 12 or higher and starting above $1500, shipping...
... Perry, I'm sure a lot of folks are laughing at your calling the most time-honored classic Fraunhoffer doublet in the traditional design and ratio offered...
I have to agree with what Bud is saying here...there's really something special about a quality long focal length refractor...Before I had my 6" F/7 AP 155, I...
... Hi Hank and thanks for your input. I just wanted to add that in the early-mid '80's my set-up was far from ideal. I used to mount my monstrous f/15 on an...
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