Orion 13022 Deluxe Mini 50mm Guide Scope with Helical Focuser Compact Deluxe Mini Guide Scope with a built-in helical focuser for precise focusing of guide stars Designed for use with the Orion StarShoot AutoGuider (sold separately), and astrophotography telescopes up to 1500mm focal length Non-rotating camera collar will not cause the attached autoguider to rotate during focus adjustments, ensuring the field of potential guide stars will not move Adjustable-aim dovetail guide scope bracket installs on virtually any astrophotography telescope quickly and easily