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This 1.25" 2x achromatic Barlow lens can be used visually, but the eyepiece holder portion also has integral T-threads so it can be used as a low profile camera adapter for lunar and terrestrial photography by simply adding an optional T-ring. The physically short (2.9”) Barlow fits into the rack and pinion focuser drawtube of most equatorial refractors and reflectors, or into the 1.25" visual back or eyepiece holder of most Maksutov-Cassegrain telescopes. Photographically, the Barlow doubles the effective focal length and focal ratio of the telescope and acts as a transfer lens to project a two times enlarged image onto the film plane of your camera for close-up lunar and terrestrial photography. It can also be used with many reflectors that do not have a moveable primary mirror or with refractors that do not have enough focuser in-travel to reach focus with a conventional camera adapter. Some vignetting may be visible with very short focal length telescopes. You'll need an optional T-ring for photographic use.
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