Orion 7222 Gray 9x50 Achromatic Finder Scope Large 50mm aperture gray finder scope lets you see fainter objects than with smaller finders 9x power magnification and a standard (inverted) 5.5 degrees field of view with superimposed crosshairs Includes a cast-aluminum bracket with a dovetail foot that fits most Orion telescopes Mounting base available for installation on non-Orion telescopes (sold separately) A significant upgrade compared to reflex sights and finders with smaller apertures