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Refractors

Group Information

  • Members: 1803
  • Category: Amateur
  • Founded: Aug 29, 2000
  • Language: English
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Activity within 7 days:

160 New Messages - 5 New Photos

Description

This site is for all refractor users, and those interested in them, to enjoy. Discussions of equipment & observing are encouraged. Owners of all types & apertures are welcome!

Members are encouraged to post and take part in discussions as you will learn more that way. An active group is also more interesting to be a member of. Please be mindful of your fellow members when posting to the site - we all want a friendly interactive group here." Posts of a partisan political or totally non astronomical nature are not acceptable and are subject to removal.

Manufacturers, dealers and their employees are asked to identify their affiliations when posting regarding their own or competitors products.

New members messages are moderated so do not bother trying to spam here.

The Home Page photo is the Lowell Observatory refractor with which Percival Lowell did his Mars studies. 24" aperture F16.1 made in 1896 by Clark. Per an article I found the lens was refigured by Lundin at the Clark company in 1905. According to a Hartmann test result I have seen in Bell's telescope book this is one of the best lenses to ever have left the Clark factory, after the rework I presume.

Membership in Grouply, or a similar phishing group, is grounds for a member being banned to protect other members privacy.

Rich Wood - astronut1001 - Owner
Darren Hennig - doktorphoton - Moderator
David Sherfy - warpedcorp - Moderator
Stewart Waters - olympus_mons_observatory - Moderator
Doug Baikey - truckstopastronomer - moderator

Most Recent Messages

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Re: 6" achromat
... What I was referring to was the fact that your star test was no where near as skewed (or wasn't even considered off enough to be consider skewed at all!)
Posted - Wed Jul 15, 2009 12:50 am
Bud Starison
starbuddy84
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Re: 6" achromat
You didn't read the post very carefully, Bud. I said near perfect... "all but eliminated". Don't be confused, Bud. This isn't brain surgery, this is fun. Have
Posted - Tue Jul 14, 2009 10:15 pm
Anthony Tripodi
atripodi2000
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Re: Star Testing (Was Re: 6" achromat)
I'm no expert, but I've heard that when star testing APO's, that its important to place a filter (yellow?) in the optical train. Hank, I think you have it the
Posted - Tue Jul 14, 2009 8:02 pm
Bud Starison
starbuddy84
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Re: 6" achromat
... Vahe, in the case to which I refer on the Tak group, the one owner had a scope which had /dramatically/ different patterns on each side, he showed them,
Posted - Tue Jul 14, 2009 7:57 pm
Bud Starison
starbuddy84
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Re: Question on 6" Achros you enjoy using....
... Is the upcoming 6" f/6 Explore Scientific a cheap achromat or triplet? I guess the achromats work well for emission and planetary nebula that emit mostly
Posted - Tue Jul 14, 2009 7:56 pm
glasspusher2001
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Message History

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2009 274 80 117 95 205 129 269
2008 390 420 199 267 374 262 152 209 294 113 62 76
2007 733 279 429 285 368 179 323 270 1121 1210 422 330
2006 26 17 20 14 14 17 8 7 614 1781 1256 1043
2005 159 158 110 101 63 76 59 73 38 49 46 42
2004 155 231 101 73 118 100 72 85 73 151 93 117
2003 180 147 154 95 107 218 222 82 194 150 86 32
2002 357 326 235 226 171 195 142 129 290 253 251 248
2001 627 346 825 669 521 461 406 385 220 305 543 398
2000 94 700 743 285 681

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