The #127 Variable Barlow Lens (1.25") features a precision sliding-lens assembly that permits variable power factors between 2x and 3x. Positive stops are provided at both ends of the lens travel, plus an engraved scale that indicates power in use.

Multi-coated for maximum image contrast and light transmission, the #127 Barlow provides precise corrections for spherical and chromatic aberrations at all photo-visual wavelengths. Clear aperture is 25mm. This popular, high-performance barlow is recommended for use on telescopes with focal ratios of f/6 and longer.