End cap for 3.5 inch focus lens, with clamp ring | Starlight

If you see scratches on the eyecup caps due to the clamp screw in the focus ring, a clamp ring will help. This end cap for 3.5-inch eyepieces with a clamp ring from Starlight Instruments presses against the eyecup cap as you turn the clamp screw. This means that there is no screw point directly pressing against the eyecup cap.

The end cap is located at the end of the extension tube of a 3.5 inch focuser and is the point where you attach your eyepieces, a mirror or prismatic diagonal or fix the camera. Check that the end cap fits your focus ring.

Tighten the clamp screw firmly but not too hard; the ring will do the job. Also check that the end cap fits the housing of the accessories you want to use.

If you want the accessories to be centered, then there is The end cap with collet clamping. For Takahashi accessories there is an end cap for Takahashi accessories.