mark993 Posted October 29, 2010 Share Posted October 29, 2010 Hey all, am i right in thinking a 2x barlow lens will double the mag of any eye piece i use with it? Link to comment Share on other sites More sharing options...
Luke Posted October 29, 2010 Share Posted October 29, 2010 Howdy,Yep the 2x barlow will double the mag of your eyepiece.If you are using a diagonal, you might be able to place the barlow between the scope and diagonal (instead of between the diagonal and eyepiece) to get about three times magnification from the 2x barlow - though this may depend on your scope. It works on my 80mm refractor if I use an extension tube (without the extension tube I can't get it to focus as the eyepiece has to be so far back from the telescope).Apparently you can also stack barlows, though I haven't tried this myself, in theory combining a 2x barlow and a 3x barlow would give you 6x magnification. Has anyone had good or bad experiences stacking barlows?? Link to comment Share on other sites More sharing options...
Astro_Baby Posted October 29, 2010 Share Posted October 29, 2010 Yes - the Barlow will double (or triple depending on the Barlows x factor -0 ie x2, x3, x6 etc).Not all Barlows are equal (or anything like) and some people just dont like them. Link to comment Share on other sites More sharing options...
John Posted October 29, 2010 Share Posted October 29, 2010 They can be very useful but need to be equal to the quality of the eyepieces they are being used with - ie: a cheap barlow lens in between a nice eyepiece and a decent scope is not a good idea !.The maximum useful magnification remains limited by the scope aperture and observing conditions of course (mostly the latter in the UK). Link to comment Share on other sites More sharing options...
brantuk Posted October 29, 2010 Share Posted October 29, 2010 Yup - all the above apply. A couple of very popular 2x are the Celestron Ultima barlow and Orion Shorty (both great quality and comparable performance). You can get them around £75 new or circa £50-£60 ish second hand.The Televue Powermates are great but a bit pricier. I use s/h regular Televue Barlows Link to comment Share on other sites More sharing options...
TheThing Posted October 30, 2010 Share Posted October 30, 2010 Tal Barlows are also worth considering. Although quite a bit cheaper (£35 - £40) they have the usual Tal optically quality, are wll made and very durable (dropped my x2 several times, but with no ill effects!) Link to comment Share on other sites More sharing options...
Pete Presland Posted October 30, 2010 Share Posted October 30, 2010 Tal Barlows are also worth considering. Although quite a bit cheaper (£35 - £40) they have the usual Tal optically quality, are wll made and very durable (dropped my x2 several times, but with no ill effects!)definitely a 2nd for tal barlows you can get them ND hand for a good price currently using a x3 for imaging great value for money! Link to comment Share on other sites More sharing options...
brantuk Posted October 30, 2010 Share Posted October 30, 2010 I second the Tals as well - forgot I have the 2x in my kit lol - great vfm budget barlow Link to comment Share on other sites More sharing options...
WayneR Posted November 1, 2010 Share Posted November 1, 2010 Thanks for the advice gents. Link to comment Share on other sites More sharing options...
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