Celestron
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Celestron 2X Barlow for 1.25" eyepieces (includes T-adapter)
$57.95While this Celestron 1.25" 2x achromatic Barlow can be used visually, it also has T-threads so it can be used as a T-adapter for lunar and terrestrial photography . . . -
Celestron 2X Omni Barlow for 1.25" eyepieces
$59.95This good quality Celestron 1.25" Barlow is fully multicoated for sharp, high contrast, 2x magnification . . . -
Celestron X-Cel LX 2X 3-element Barlow for 1.25" eyepieces
$109.95This 2x Celestron X-Cel LX three-lens air-spaced fully multicoated 1.25" Barlow performs a lot more expensively than it costs . . .