• Orion PinPoint Bahtinov Masks will help you achieve precise focus in seconds
• This Bahtinov Mask fits telescope tubes with an outer diameter of 58mm to 83mm (2.28" to 3.66")
• Orion Bahtinov Focusing Masks produce a distinct, intersecting 3-line pattern once accurate focus is achieved
• Three Orion-exclusive adjustable padded pegs provide a secure grip once installed on a telescope
• Compatible with any type of telescope, and especially useful for astrophotography setups

• Compatible with the Radian 61 Telescope