beanyboy1982 Posted February 15, 2015 Share Posted February 15, 2015 Seen this on eBay I know you get what you pay for but are their any good http://pages.ebay.com/link/?nav=item.view&alt=web&id=141570830025 Link to comment Share on other sites More sharing options...
ronin Posted February 15, 2015 Share Posted February 15, 2015 Joys Optics, based in Guildford I think.The barlow itself is normally £16:90.So if you get in a bidding war stop at £16:90 as you can simply buy it from the website at that cost.Joys seem reasonable, above board and supply items that are OK. Link to comment Share on other sites More sharing options...
nightfisher Posted February 15, 2015 Share Posted February 15, 2015 Looks to be about same as the skywatcher barlow, you can get these for about 10-15 pounds, they are okay for the money but way behind some of the more expensive barlows Link to comment Share on other sites More sharing options...
slothead Posted February 15, 2015 Share Posted February 15, 2015 Looks to be about same as the skywatcher barlow, you can get these for about 10-15 pounds, they are okay for the money but way behind some of the more expensive barlowsNightfisher, When you say "way behind" are you suggesting not as good, and if so in what regard do they suffer? In other words what are the primary acceptance criteria for a barlow, and which do the "cheapies" lack? Thanks Link to comment Share on other sites More sharing options...
beanyboy1982 Posted February 15, 2015 Author Share Posted February 15, 2015 what does achromatic mean ? Link to comment Share on other sites More sharing options...
Dave In Vermont Posted February 15, 2015 Share Posted February 15, 2015 what does achromatic mean ?Achromatic infers there are two lenses in it. Two lenses are supposed to compensate for the fact that the red-shift of light comes to a focus in a longer distance, while the blue-shift of light focuses in a shorter range. So the two lenses help the focal-point merge so that you don't end up with a view that is heavily colour distorted - with objects appearing to be surrounded in blue - purple light.Regards the Barlow offered above, I'd avoid it like the Plague. If you want a Barlow, save up and get the best available. This way you will be able to never have to buy another Barlow. You will have the best. And a Barlow should be the best Barlow, otherwise they can be more annoying than being useful. I'd hate to think what a no-name brand Barlow would do to the view. I can guess.The best Barlow is invisible. This is to say that it gives no indication that it's present in the optical-path of the image you see at the eyepiece. Accomplishing this means using the highest-end glass and the best coating out there. This results in an image without dimming or distortion from scattering the light coming through it. A poor Barlow can cause a view resembling looking through a piece of crumpled cellophane that has suffered smoke-damage from a house fire. The best Barlow I have seen is ( I hate plugging this brand - but I must make an exception here) TeleVue. More money - but it's likely you'd never sell it to buy something better.Such Joy!Dave Link to comment Share on other sites More sharing options...
beanyboy1982 Posted February 15, 2015 Author Share Posted February 15, 2015 so besides the televue is their any other good makes out their and what sort of price are you looking for a good one ? Link to comment Share on other sites More sharing options...
nightfisher Posted February 15, 2015 Share Posted February 15, 2015 Nightfisher, When you say "way behind" are you suggesting not as good, and if so in what regard do they suffer? In other words what are the primary acceptance criteria for a barlow, and which do the "cheapies" lack? ThanksThe "cheapies" wont give such a sharp image, you will get sharper, and better contrast with say , a £35 TAL x2 barlow, the Revelation x2.5 is a sharp barlow and only £30 ish Link to comment Share on other sites More sharing options...
ghostdance Posted February 15, 2015 Share Posted February 15, 2015 Joy is a great seller - I've bought a couple of items and she offers excellent service. But in regard to Barlows, I'm with Dave-In-Vt on this one.Buy the best you can afford, there are good ones out there ( but I *love* my Tele Vue 3×) - I wouldn't go for an unbranded one - you just don't know what you're going to get. Link to comment Share on other sites More sharing options...
mikeDnight Posted February 15, 2015 Share Posted February 15, 2015 In early 2004 a friend brought a Skywatcher 102mm star travel F5 refractor for me to take a look at, and to see how well it performed. In typical mad astronomer fashion I decided to push this rich field achromat to its limit. Its not a planetary scope, so I thought it would be a good idea to check out its performance on one of the most challenging planetary targets, Mars. Now it is often said that there's no point in observing Mars when it's less than 10 seconds of arc in diameter, at the time of this observation Mars was 4.8 seconds of arc and getting low in the west. I placed a 3X TV Barlow into his scope along with a 7mm Nagler eyepiece giving a magnification of approximately X218. The detail visible on Mars tiny disk stunned us both. Sinus sabaeus, syrtis major and Hellas along with other more subtle details were visible without too much difficulty. This crazy experiment proved two things to me. First, the little RFT was quite a good scope, and second that the. 3X TV Barlow was a seriously good piece of kit. I'd not hesitate to give that Barlow the thumbs up! The only thing to bear in mind is that it is a long Barlow and not one of the more common dumpy versions. 3X TV Barlow is probably the best Barlow I've ever used!You could also consider TV's Powermate options.Mike Link to comment Share on other sites More sharing options...
Charic Posted February 15, 2015 Share Posted February 15, 2015 ........and at the other end of the scale, I had the 2.5x Revelation Astro Barlow, but found it to be just a little to powerful for my eyes/telescope or maybe both. Then a recommendation for a 2x Skywatcher deluxe was made, and I have no regrets.I don't see anything untoward's either when in use, and I often unscrew the lens cell and use it without the barrel, attached directly to my EP giving about 1.6x Power. At this level, it works well for my needs. Link to comment Share on other sites More sharing options...
beanyboy1982 Posted February 16, 2015 Author Share Posted February 16, 2015 Is this about the right price for one of these then ? http://pages.ebay.com/link/?nav=item.view&alt=web&id=271743344789 Link to comment Share on other sites More sharing options...
beanyboy1982 Posted February 16, 2015 Author Share Posted February 16, 2015 How much are the tele vue from flo ? (X2) Link to comment Share on other sites More sharing options...
ghostdance Posted February 16, 2015 Share Posted February 16, 2015 How much are the tele vue from flo ? (X2)You'll find a cornucopia here:http://www.telescopehouse.com/acatalog/Telescope_House_Barlows.htmThe 2× TV costs more than the 3×.... They do come up for sale used sometimes, on Ebay and Astro B&S.But TS' excellent selection above should keep you occupied Link to comment Share on other sites More sharing options...
Dave In Vermont Posted February 16, 2015 Share Posted February 16, 2015 I wasn't going to venture into mentioning the PowerMate from TeleVue, but now that someone else has opened Pandora's Box.....I have a 2.5X 1.25" TV PowerMate. I'll just say this: It IS invisible.Clear Skies,DavePS: The listed prices on FLO, you linked Ghostdance, are lower than what they are here in the US. Wow! Link to comment Share on other sites More sharing options...
beanyboy1982 Posted February 17, 2015 Author Share Posted February 17, 2015 so what is a better buy a x2 or a x3 i have a 200p dob if that makes any differance Link to comment Share on other sites More sharing options...
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