Product Name: TelescopeLens structure: double separation refractionLens coating: full surface multi-layer coatingLens focal length: 50mmLens aperture: F/5.6Lens positioning: 135mm full frame photography and telescopic observationLens type: fixed focusEyepiece interface: 2 inches to 1.25 inchesObservation accessories: 45 degree mirror, PL25mm eyepieceLens mount: M42X0.75mm threadTripod interface: camera universal tripod compatible with dovetail slotted celestial equatorial mountNote:1. The above dimensions are manually measured according to the actual product, allowing a little error.2. All photos are taken in kind, and each display may be diffet due to illumination and there may be a slight chromatic aberration.3. This product only sells telescopes that appear in photos.4. Your satisfaction is our goal,If you have any questions, we will reply within 24 hours, thank you.