Refractors at Yahoo! Groups

Re: Refractor for Double Stars

Chris Lord — Thu, 19 Nov 2009 15:53:20 GMT

I don't really know. The focuser looks well made, but I prefer TEC's focuser. The OTA I saw was finely crafted. Try asking GPU for the full spec. Chris Lord

Refractor for Double Stars

patconlon — Thu, 19 Nov 2009 12:46:01 GMT

Hello Chris sorry for going on about this but what did you think of the build quality of the GPU telescope you seen I know it was a while ago so it might be

Re: Refractor for Double Stars

pjanway — Wed, 18 Nov 2009 17:29:56 GMT

... Pat, There are only two companies that I know of that make bifilar micrometers - Retel Ltd in England and van Slyke in the U.S. Here is the van Slyke link:

Re: Refractor for Double Stars

Chris Lord — Wed, 18 Nov 2009 09:16:53 GMT

Pat, I met Andras Papp at Kelling Heath in April 2005, He was staying with a dealer called Chris Garvey. To the best of my knowledge GPU is still a going

Refractor for Double Stars

patconlon — Tue, 17 Nov 2009 21:25:32 GMT

HELLO Chris thank you for all the information on eyepieces I have been away this last two days so only got your post now so I will have to study it a before I

Re: Refractor for Double Stars

Warp — Mon, 16 Nov 2009 21:35:37 GMT

Unless it is against the rules, I will be posting in the files section a summary description of two OTA's I am putting up for sale. One will be a classic

Re: VIXEN NeoAchro 140 & AX103S

jimcurrymaine — Mon, 16 Nov 2009 14:51:24 GMT

... triplet apo and dedicated field flattener. < After a series of reflectors up to 12" the 140NA is my first refractor. I use it for galaxy and other faint

Re: Refractor for Double Stars

Guido Santacana — Mon, 16 Nov 2009 11:40:47 GMT

The excellent 76 and 80mm doublets of yesterday with those high f numbers are virtually unavailable today. My only experience with a triplet is observing

Re: Refractor for Double Stars

Chris Lord — Mon, 16 Nov 2009 10:02:56 GMT

I prefer TMB Mono's & Zeiss Abbé Ortho's followed closely by pre war Zeiss Abbé's and also Brandon Ortho's. I have a set of UO HD Ortho's which are fine

Re: Refractor for Double Stars

ntvru — Mon, 16 Nov 2009 09:40:40 GMT

... I can confirm your experience. My vintage BORG 125mm F/8 ED doublet beats almost perfect 6" F/10 achromat (which was a collimator on an optical test bench)

Re: Refractor for Double Stars

Chris Lord — Mon, 16 Nov 2009 08:27:10 GMT

Well, my first telescope was a 3-inch f/16 Littrow refractor. I put it together in 1969 and eventually sold it in 1988. I used it for double star observing,

Re: Meade LXD 75 AR6 Refractor

bonview@... — Mon, 16 Nov 2009 04:46:35 GMT

Sky & Telescope did an article about these prisms 3 or 4 years ago. My understanding was it only helped with the atmosphere issue. ... From: Warp

Re: Meade LXD 75 AR6 Refractor

bonview@... — Mon, 16 Nov 2009 04:39:17 GMT

Thanks again. Sorry on being slow to respond. I understand. Because of the tree line atmospheric dispersion is not a problem. ... From: William Hamblen

Re: Refractor for Double Stars

Guido Santacana — Sun, 15 Nov 2009 21:48:09 GMT

An F/16 doublet of excellent quality has so little if any color that it would probably give a good run to any triplet of equal aperture. I don't think that

Re: Refractor for Double Stars

patconlon conlon — Sun, 15 Nov 2009 20:57:08 GMT

Thanks folks for the replies I think I will go with the TEC if at all possible I was wondering Chris if you have any advice on eyepieces to use with it .