Offered in a 2x magnification, the Big Barlow is ideal for Newtonian scope owners. It will be parfocal with both 2" and 1¼" eyepieces in this application. Features include 1¼" eyepiece adapter, 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.
