1.25" Barlows Offered in 2x and 3x magnifications, these 1.25" Barlows perform identically. Simply choose either or both based on your eyepiece collection. Features include parfocal-ization, 1.25" filter threads, captive lock screws that won't fall out and full multicoatings. 2" Big Barlow Offered in a 2x magnification, the Big Barlow is ideal for Newtonian scope owners. It will be parfocal with both 2" and 1.25" eyepieces in this application. Features include threads for 48mm filters, captive lock screw and full multi-coatings.
Note: The Big Barlow is not recommended for use with 2" diagonals because it's length prevents it from being parfocal. With some telescopes, focus might not be reached, particularly when the interface lens is also used with it. A far better approach with no potential problems in any scope or with any eyepieces is to use the 2" 2x Powermate (#PMT-2200), which essentially includes the interface function. See the write-up on Powermates for more details. BLW-2125 2.0x Barlow 1.25" 2x Barlow 0.30lb; BWC-2200 2x BIG Barlow 2" 2x BIG Barlow 0.75lb; BLW-3125 3.0x Barlow 1.25" 3x Barlow 0.40lb.
