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  1. Tele Vue 2X Big Barlow for 2" eyepieces, with 1.25" eyepiece adapter

    This 2" 2x Clamp Ring Big Barlow can be used with any telescope using a 2" focuser. As it is only 4.5" long, it can also be used in most 2" star diagonals for 2x magnification.

    It can also be placed into a 2" focuser in front of a 2" star diagonal to give higher magnification than the nominal 2x. Some refractors might not have enough focuser travel to allow this directly, however. . . .

  2. Astro-Tech 2X achromatic Barlow for 1.25" eyepieces

    This physically short (3.1") Astro-Tech 2x achromatic Barlow is an inexpensive way to cleanly double the power of any 1.25" eyepiece in your collection . . .
  3. Astro-Tech 2X apochromatic ED Barlow for 2" eyepieces, with 1.25" adapter

    Here's an exceptional bargain - an optically premium 2" Astro-Tech 2x true apochromatic Barlow with ED glass and a 1.25" adapter at a low price you would normally expect to pay for an ordinary achromatic 1.25" Barlow . . .
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