This 60mm f/4.7 refractor guide scope is super economical! It comes ready to use with rings and a dovetail. ZWO made sure this system was lightweight (640g), allowing you to use it on most any scope or mount. Add an inexpensive brand-specific t-ring to the ZWO Guidescope and attach it to your DSLR camera. The guide mirror has a very good optical quality! And can be compatible with all ASI cameras.