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Hi Glob 3.
What are you planning on using the barlow for?
My best barlow is my 1.8x televue barlow. Bought it years ago and it is a real ripper and now done approx 10yrs (better even by a smidge than the GSO 2x 2 inch barlow). Also it is 1.25 inch. I use it with my 4.8mm Nagler type 1 (was state of the art then!) - poor eye relief but what a great combo for sharpness (and light and afordable). You need the barlow to improve the eye relief with the 4.8mm. Ive had great planetary views with this barlow. My scope was then an 4 inch achromat by the way (light yellow filter also used) and great views of planets up to 275x.
I havent tried the 2.5x or 5x powermates but I've never looked through a bad televue either. Perhaps Im just a bit fussy with my barlows but remember they do last. Over 10yrs a good barlow pays off.
Cheers
David
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