Search found 138 matches

by Bunny
Wed Mar 22, 2006 4:44 pm
Forum: Telescopes and instruments
Topic: 6" Achromatic refractors?
Replies: 42
Views: 14915

brian livesey: Quoting figures about optical performance is always contentious. I suppose the best way to do it is to compare instruments,side by side,in the field. I agree, that would be the best. brian livesey: I did read somewhere that,due to absorption,mirror and objective become equal at aroun...
by Bunny
Wed Mar 22, 2006 4:34 pm
Forum: Telescopes and instruments
Topic: 6" Achromatic refractors?
Replies: 42
Views: 14915

brian livesey: Others say that a refractor gives 50% better performance than the same aperture reflector. I have a 4" refractor and the light grasp doesn't seem to quite compare to a 6" reflector I once built. By the way,in one of his books,"Uncle Patrick" described a 6" refractor as "..a powerful ...
by Bunny
Thu Mar 16, 2006 8:14 pm
Forum: Telescopes and instruments
Topic: 60mm Refractors Cheap
Replies: 6
Views: 3169

GordonCopestake wrote:for a little bit more you can get a Vixen 70mm refractor
http://www.iankingimaging.com/show_product.php?id=421

Admitidly thats without a mount, but the difference in quality is orders of magnitude.
Crikey, that does seem like a great deal!
by Bunny
Thu Mar 16, 2006 5:55 pm
Forum: Telescopes and instruments
Topic: 60mm Refractors Cheap
Replies: 6
Views: 3169

Well I suppose that the lenses may be plastic (I assume you mean the objective?), but if it is a proper glass achromat then I thought it wasn't bad. Yes, it would be classified as a "department store scope" and those are not always that cheap either; Argos used to sell a Tasco 4.5" reflector for ab...
by Bunny
Wed Mar 15, 2006 11:29 pm
Forum: Telescopes and instruments
Topic: 60mm Refractors Cheap
Replies: 6
Views: 3169

60mm Refractors Cheap

We were having a discussion about small aperture grab 'n' go scopes here:

http://www.popastro.com/phpBB2/viewtopic.php?t=2119

I saw some Meade branded 60mm refractors in ASDA the other day selling for £25 (well, £24.99) that might fit the bill?
by Bunny
Mon Mar 13, 2006 11:16 pm
Forum: Telescopes and instruments
Topic: Celestron ?
Replies: 4
Views: 2247

Hi Ian, Not sure this helps, but as you know, both Meade and Celestron are American firms. One gets the impression reading US message boards that they are like Ford and General Motors of the telescope world. Like those two companies, they produce cheapish entry-level stuff (which I believe is manuf...
by Bunny
Sun Mar 12, 2006 7:41 pm
Forum: Telescopes and instruments
Topic: Celestron C4-R Refractor?
Replies: 6
Views: 3186

Hello Gareth, I have a very similar scope (almost identical). I believe the CG4 is the equivalent of my EQ3. The mount and aluminium tripod are weak points. Make sure you tighten the equatorial head bolt (the large horizontal bolt that goes through the mount) adequately if there is any sideways pla...
by Bunny
Sat Mar 11, 2006 1:30 pm
Forum: Telescopes and instruments
Topic: Telescope/web camera
Replies: 4
Views: 2540

It is produced by a company called Eastcolight in Hong Kong. Even their website says very little about it. http://supplier.tradeeasy.com/nf/p24230-b36b-156064-702971-3/15_20_25_35_Power_4_In_1_E-Telescope.html It seems to be sold in toyshops sooo........ :wink: John Why are they not promoting this ...
by Bunny
Wed Mar 08, 2006 6:42 pm
Forum: Telescopes and instruments
Topic: If you had £100, give or take...
Replies: 59
Views: 20510

Yes, interesting little scope that, isn't it? I've been looking at that myself. In which case will one of you two do the decent thing and crack before I do? ;) Ha! Sorry Dave, I can't really justify the purchase of yet another scope (I've got a 4" refractor and a 110mm reflector), though it does se...
by Bunny
Wed Mar 08, 2006 6:11 pm
Forum: Telescopes and instruments
Topic: If you had £100, give or take...
Replies: 59
Views: 20510

nealeh:
I keep looking at the Antares MC70
Yes, interesting little scope that, isn't it? I've been looking at that myself.
by Bunny
Wed Mar 08, 2006 6:07 pm
Forum: Telescopes and instruments
Topic: If you had £100, give or take...
Replies: 59
Views: 20510

You're welcome Dave,

I don't blame you for keeping your options open.
by Bunny
Wed Mar 08, 2006 5:58 pm
Forum: Telescopes and instruments
Topic: If you had £100, give or take...
Replies: 59
Views: 20510

OK then, how about another option?

There is an 80mm rich field on an EQ mount for €135 on special offer at Teleskop Service

Obviously you would have to find out about p&p.

Are you just interested in an OTA?
by Bunny
Wed Mar 08, 2006 5:38 pm
Forum: Telescopes and instruments
Topic: If you had £100, give or take...
Replies: 59
Views: 20510

If you want a short tube achro Sky's the Limit have a small 70mm short tube. C/A is likely to be an issue as stated before, but it's cheap as chips at £39 (+ £7.20 p&p), and if no good for intended use, might just make a decent large finder? Might be an idea to upgrade the diagonal (Antares Scope...
by Bunny
Tue Mar 07, 2006 12:10 pm
Forum: Telescopes and instruments
Topic: New telescope user questions..... advice please ?
Replies: 17
Views: 6351

I must admit im a little confused over the eyepieces still,.... the ETX comes with 26mm eyepiece, so i assume this gives more "zoom" than the 6-9mm one ? so why would the 6mm or 9mm EP be better for lunar viweing ? or do i have that totally backwards ? Hello Andy The shorter eyepieces are higher po...
by Bunny
Fri Mar 03, 2006 7:21 pm
Forum: Telescopes and instruments
Topic: Super Plossl vs Plossl
Replies: 5
Views: 2807

Scrumpy: A lower F-number or focal ratio (f/ratio) scope will allow a wider field to be viewed and more light will fall on the focal plane. However a higher focal ratio scope will provide a sharper, more contrasty image so these provide better planetary views. Also a longer focal ratio reflector wi...