Size and color - Diameter: approx 57 mm - Color: black and green Material and practicality - Material: aluminum alloy - Easy to install and use; designed for straightforward setup and operation Included telescope accessories - Barlow lenses: 2x and 3x magnification - Moon filter - Planet filter - These options provide enhanced detail for the Moon, planets, and deep-sky objects Astrophotography and imaging compatibility - T-ring adapters - Prime focus adapters - Field flatteners - Reducers - Smartphone adapters - Compatible with special astronomy cameras Use scenarios - Lunar and planetary viewing: attach to your telescope, switch between 2x and 3x Barlow for magnification, and use the Moon or Planet filters to improve contrast and reveal surface detail. - Astrophotography with a camera: connect a T-ring adapter to your camera and pair with a prime focus adapter to capture direct images of celestial targets; use a field flattener for wide, flat fields and a reducer to expand the field of view; smartphone adapters allow quick, on-site sharing; compatible with dedicated astronomy cameras. - Deep-sky observing and imaging: use the bundled filters and optical accessories to optimize views or images of deep-sky objects, supported by the field flatteners and reducers for improved image quality and coverage.