The enhanced fully multi-coated CEMAX™ 2X Barlow Lens. 1.25" Barrel Size. Specifically designed for use at H-alpha (or Hα) wavelengths, this Barlow uses optimized coatings to enhance contrast, minimize glare and also affords excellent contrast for planetary viewing. With caps.
Please note: This Barlow is NOT a filter. For solar observing it MUST be used in conjunction with a Coronado Hα Solar telescope or a telescope with a Coronado filter set appropriately and safely mounted.