SVBONY red dot finder scope is the way to go if you want the easiest way possible to locate an object and center it in your eyepiece. An adjustable small red LED dot is projected onto a non-magnifying viewing window so you can aim the main telescope quickly and easily Features: Very small footprint: Can attaches to just about any telescope due to the small footprint;even works great with astronomical binoculars and spotting scopes Large thumbwheels: Very easy to adjust;thumbwheels allow positioning of the red dot horizontally and vertically for precise telescope alignment Included dovetail mount bracket Comes with a bracket that fits the quick-release dovetail mounting on many telescopes(for installation on other telescopes, the dovetail base can be purchased separately) Application: This red dot finder scope fit for Celestron 80EQ 80DX 90DX SE SLT OMNI Series astronomical telescopes and so on SVBONY universal dovetail base for optical astronomical telescope finder scope; Universal dovetail base for finder scope: Ideal for custom installation of a finder scope on telescopes not already equipped with a compatible base. Features --Dielectric coatings provides 99% reflectivity --M28.5x0.6 filter thread can connect with 1.25in filter directly --Built-in brass ring to prevent the accessories barrel from being scratched --Machined and anodized aluminum housing make the SV188P dielectric diagonal durable and uniform Compatible with Telescope 1.SV188P 1.25in dielectric diagonal compatible with any 1.25in refractor telescope 2.SV188P can not connect with the SCT telescope directly, the additional adapter is required if you want to connect SV188P with the SCT telescope 3.SV188P does not fit for reflector telescope