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Hi,
I have several barlows including a 1.25" 2.5X TV Powermate, a 1.25" 1.8X Televue barlow and a 2" 1.6X Japanese made Antares barlow.
They are all very good and you would be happy with any of them. The 1.8X TV barlow is an early version of the 1.25" 2X TV barlow. IMO the best value for money barlow at present is the 1.25" 2X TV barlow. It is an exceptional performer and isn't overpriced.
The 2" 2X Japanese made barlow that Bob mentions is also very good. It is sold under several disguises including University Optics and Orion USA.
Having said that and notwithstanding I own a 2" barlow, I just never ever use it. I only use my barlows to achieve higher powers than I can achieve with my 1.25" native eyepieces and I always do that with my 1.25" 2.5X TV Powermate or my 1.25" 1.8X TV barlow. Invariably the only eyepieces I ever barlow are the 10mm, 7mm and 5mm Pentax XW's and the 8.5mm Pentax XF. It just depends on where the seeing runs out.
Cheers,
John B
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