Parfocalizing Ring 1.25" with Dual Brass Thumbscrews

Parfocalizing Ring: In optics, the term "parfocal" refers to a set of lenses or optical devices that maintain focus when changing magnification. A parfocalizing ring, in the context of a camera or telescope, is a device or accessory that helps achieve or maintain parfocality.

1.25" Diameter: The "1.25"" in the description likely refers to the diameter of the accessory, indicating that it is designed to fit into a 1.25-inch (31.75 mm) diameter eyepiece holder or similar interface. This size is common in telescopes and some camera systems.

Dual Brass Thumbscrews: The mention of "dual brass thumbscrews" suggests that the ring has two thumbscrews made of brass. Thumbscrews are used for securing and adjusting components without the need for tools. Brass is often chosen for its durability and corrosion resistance.

Purpose: The parfocalizing ring with dual brass thumbscrews likely serves a specific purpose in the context of astrophotography, microscopy, or another optical field. It may be used to lock eyepieces or other optical components into a consistent focus position, ensuring that minimal adjustments are needed when changing equipment.