What size finder scopes do the Explore Scientific Rings fit?
These Explore Scientific finder scope rings are designed specifically to hold finders with a 50mm tube diameter, which is a common size for larger, more capable finder scopes and guide scopes.
Are these Explore Scientific rings compatible with finder bases from other brands?
The bracket uses a dovetail foot that is compatible with many standard finder scope bases, including those from Explore Scientific, Vixen, Synta (Celestron/Sky-Watcher), and others. However, it's always recommended to check the specific dimensions of your existing base to ensure a secure fit.
Why are there three adjustment screws on each ring of the Explore Scientific 50mm rings?
The three-screw system on each of the two rings creates a total of six adjustment points. This allows for very precise and stable alignment (collimation) of your finder scope with your main telescope. You can make fine adjustments to center a target star in both the finder and the main eyepiece, ensuring accurate pointing.
Does the finder base come with the Explore Scientific 50mm rings?
No, the finder scope base that attaches to the telescope's optical tube is sold separately. This product includes only the two rings mounted on the quick-release dovetail bracket.
How do I align my Explore Scientific 50mm finder scope with my 8" SCT using these rings to find the Andromeda Galaxy (M22)?
First, point your 8" SCT at a bright, distant terrestrial object during the day or a bright star like Vega at night. Center the object in a low-power eyepiece in your main scope. Then, without moving the telescope, use the six thumbscrews on the rings to move the finder's crosshairs until they are also centered on the exact same object. Once aligned, your finder will accurately point to celestial targets like the Andromeda Galaxy (M31).
Will these Explore Scientific 50mm rings securely hold a heavier right-angle illuminated reticle finder on a Dobsonian telescope?
Yes. The dual-ring design is specifically intended to provide a stable, flex-free platform for heavier accessories like 50mm right-angle finders, which often include prisms and illuminated reticles. The 6-point contact system ensures the finder remains securely collimated, even when mounted on a Dobsonian that is moved frequently across the sky.
