Essentially a 30mm f/4 refractor, the ZWO Mini Guide Scope comes ready to use with guider rings and dovetail for simple mounting. This lightweight (1.1 lb.) guidescope allows you to use it on most any telescope or mount. You have the option to attach an inexpensive brand-specific t-ring to the ZWO Mini Guidescope and attach it to your DSLR camera. It can also be used as a visual finder if you provide an eyepiece. A perfect partner to the ZWO ASI120MM mini camera.