This solidly built 50mm Guide Scope will help guide you to capturing higher quality astrophotos. With its 50mm lens and smooth helical focuser, the versatile 50mm Multi-Use Guide Scope with Helical Focuser is an ideal addition to any astrophotographers collection of gear.Specifications:Material: MetalFocal Length: 183mmInterface: 31.7/1.25inObjective lens: 50mmCoating: Fully multi-coatedItem length: 235mm / 9.3inItem Weight: 580g / 1.28lbPackage Weight: 800g / 1.76Package Size: 280 * 140 * 140mm / 11.0 * 5.5 * 5.5inPackage List:1 *As we all know, diffet computers display diffet colors,The color of the actual product may be slightly diffet from the picture below.