SV106 provides you with a compact & lightweight star guiding solution. SV106 60mm multi-use guide scope with Helical Focuser is an ideal addition to any astrophotographer's collection of gear. Works with most short-medium focal length imaging systems. Full metal structure. Suitable for lens barrels with diameters ranging from 43-70mm. 1.25" standard interface. Built-in brass ring for eyepiece protection. External M42*0.75 male thread - can be connected to SLR through T ring(not included in the package). Supplied with 3-point adjustment rings for accurate alignment. Compatible with most Synta/Orion/Sky-Watcher-style finder shoes & clamps. Nylon-tipped thumbscrews. Avoid scratches on the lens barrel. For precise aiming. SV135 eyepiece is a good assistant for you to observe and take pictures of the planets. More comfortable to view the moon, Jupiter and Saturn. 36°-52° field of view. This is a zoom eyepiece considering that it zooms from 7mm to 21mm. which allows you to see different wide field of view under the same viewing conditions. Meet your different needs. Provide comfortable observation experience. 13-14mm wide eye relief can also provide an easy and pleasant viewing experience. It is also friendly to people wearing glasses.