For visual observations and astrophotography. Magnification: 2x. Levenhuk 2x Barlow Lens with Camera Adapter is a very useful two-in-one accessory that doubles your telescopes focal length and also serves as a T-thread adapter for a digital SLR camera. Just attach a digital camera to your telescope using this accessory and you will be surprised by the detailed high-quality images of observed objects. If you dont need such a high increase you can simply remove lenses from the barrel. This universal tool also allows you to use optical filters with it. Summing it up: you can use this accessory simply as a Barlow lens that will increase the magnification twofold, and also make high-quality, crisp and vivid images of distant celestial objects by attaching a camera through a T-thread. Fully multi-coated optics provide exceptional quality of the views. 1.25 barrel diameter allows you to use it with telescopes of any brand and make. Features: Levenhuk 2x Barlow Lens provides twofold increase; designed for use with powerful telescopes (including catadioptric telescopes and apochromatic refractors); fully multi-coated optics; may be used as a T-adapter for digital SLR cameras (with the optical system and without); may be used with optical filters; barrel diameter of 1.25.