Starlight Instruments True 3.0" End Cap w/ 3.0" Compression Ring Opening

This end cap is specifically designed for the Starlight Instruments Feather Touch True 3.0" focuser series, such as the FTF32xxB-A. It is not compatible with their standard 3.0", 2.5", or smaller focusers due to differences in the drawtube threading and diameter.

The compression ring is ideal for visual observers who frequently swap 3.0" eyepieces or accessories. It provides a quick, secure, and non-damaging grip. A threaded end cap is preferred for dedicated imaging setups, as it creates a more rigid connection for heavy cameras and filter wheels.

No. The Starlight Instruments end cap uses a soft brass compression ring that grips the accessory barrel evenly around its circumference. This prevents the scratches and gouges that can be caused by direct contact with thumbscrews.

This end cap is for attaching accessories with a 3.0" slip-in barrel. If your Paracorr or imaging train terminates in a 3.0" barrel, this will provide a secure connection. However, for a rigid, threaded connection required by many imaging setups, a threaded end cap specific to your corrector's thread pitch would be a more robust solution.

Yes, Starlight Instruments end caps like this one typically include three small set screws on the face. These allow for fine collimation adjustments to eliminate sensor tilt, ensuring your imaging plane is perfectly perpendicular to the optical axis.

Absolutely. This True 3.0" End Cap is the correct component to adapt your FTF3215B-A focuser for use with 3.0" barrel eyepieces. It will provide the secure, centered grip needed for large and heavy visual accessories.