For astronomical telescopes 6x30 mm  right angle Achromatic Finder Scope for Telescopes
 
 
Quality crosshair viewfinder makes targeting celestial objects in your telescope easy!
Fully coated 30mm right angle achromatic finder scope optics yield sharp, bright views for easy aiming
6x power magnification reveals objects of interest in the sky
Aluminum dovetail bracket has easy X-Y oriented alignment screws
incuded bracket features a dovetail shoe that fits mounting bases found on most  telescopes; extra dovetail bases are available (sold separately) for attaching the finder scope to other telescopes