Orion Optics UK Radius Blocks for 200mm Scopes

The 200mm Radius Block serves as a specialized adapter to mount accessories onto the curved surface of a 200mm (8-inch) optical tube. Its curved base perfectly matches the telescope's radius, providing a solid, stable, and flex-free platform for heavy items like guide scopes, finders, and dovetail bars.

A flat adapter on a curved 200mm tube will only make contact at a single line, creating a pivot point that is prone to rocking, tilting, and flexure under load. A radius block makes full-surface contact, distributing the load evenly and creating a mechanically rigid connection that is essential for maintaining precise alignment in astrophotography.

To securely mount a dovetail bar on top of your 200mm telescope, you will typically need two radius blocks. This creates two stable contact points, preventing the bar from twisting or flexing along its length. This product is sold as a single block, so you would need to purchase a quantity of two for this application.

These blocks are designed to be a versatile mounting foundation. Common accessories mounted with them include:

• Dovetail Bars: For mounting guide scopes, piggyback cameras, or other hardware.
• Finder Scope Bases: To provide a more secure attachment than standard plastic bases.
• Guide Scope Rings: For a direct, low-profile guide scope setup.

While designed for Orion Optics UK telescopes, this block should be compatible with any telescope that has a 200mm outer tube diameter. However, you must verify the hole spacing and hardware requirements for your specific telescope and accessory, as this may vary between manufacturers.

Mounting hardware is not specified as being included with this block. You will need to source the appropriate screws or bolts based on the requirements of your optical tube and the accessory you intend to mount.