For many 50mm finder tubes to work with 3-point finder brackets, additional or replacement rubber O-rings are needed.
This item will also suit some finders marketed under the Apertura, iOptron, Orion, TPO, and other brands because it has been tested to fit on GSO's 50mm right-angle and straight through finders.
O-ring thickness = 1.5 mm; inner diameter = 46 mm. sold separately.
For many 50mm finder tubes to work with 3-point finder brackets, additional or replacement rubber O-rings are needed.
This item will also suit some finders marketed under the Apertura, iOptron, Orion, TPO, and other brands because it has been tested to fit on GSO's 50mm right-angle and straight through finders.
O-ring thickness = 1.5 mm; inner diameter = 46 mm. sold separately.