Starlight Instruments True 3.0" End Cap w/ 2.0" Compression Ring Opening

This end cap allows you to securely use standard 2.0" accessories, such as eyepieces, diagonals, and camera nosepieces, with a Starlight Instruments True 3.0" Feather Touch focuser. It threads directly onto the drawtube for a rigid, native connection.

This end cap is listed for the Starlight Instruments True 3.0" Feather Touch focusers. The product text for it appears to be copied from the 3.0" end cap EC30-1905-1, so check with us before ordering it for a 3.0" Feather Touch that is not a True 3.0" model.

The end cap contains an internal compression ring. When you tighten the thumbscrews, they push this ring inward, causing it to clamp down evenly around the entire circumference of your 2.0" accessory barrel. This provides a much more secure and non-damaging grip than a single set screw.

This end cap offers superior rigidity. A drop-in adapter creates an additional mechanical junction held by set screws, which can introduce flex or tilt, especially with a heavy camera or diagonal. By threading directly onto the drawtube, this end cap creates a single, solid unit, which is critical for maintaining alignment in demanding imaging applications.

Yes, this is exactly the correct component for that scenario. It will allow you to securely mount your 2" Tele Vue diagonal directly to the True 3.0" focuser, ensuring a stable and perfectly aligned optical path for visual observation.

Absolutely. This is an ideal solution for imaging. The rigidity provided by the direct-thread connection and the secure grip of the compression ring will help prevent any tilt in your imaging train, ensuring your camera sensor remains perfectly orthogonal to the light path for sharp stars across the field.