Starlight Instruments 3.5" End Cap for Takahashi 72mm Male Threaded Accessories

Its primary purpose is to provide a secure, threaded connection between a 3.5" Starlight Instruments Feather Touch focuser and Takahashi accessories, such as field flatteners or reducers, that have a male 72mm x 1mm thread. This is critical for astrophotography to prevent tilt and flexure in the imaging train.

A threaded connection is far more rigid and secure than a compression ring. For heavy imaging trains, this end cap eliminates the potential for sag, tilt, or rotation, ensuring the camera sensor remains perfectly aligned with the optical axis throughout an exposure.

No. This end cap is designed to thread onto the drawtube of a Starlight Instruments 3.5" Feather Touch focuser. It adapts the Starlight focuser to accept Takahashi accessories, not the other way around.

You must check the specific thread on your flattener. This end cap has a female M72x1 thread. If your Takahashi flattener or reducer has a matching male M72x1 thread for connection, then this adapter is the correct component to attach it to your 3.5" Feather Touch focuser.

Installation is straightforward. It typically involves unthreading the existing end cap (like a 2" compression ring) from the drawtube of your 3.5" Feather Touch focuser and simply threading this new cap in its place until it is snug.

This is a fixed adapter designed for precise alignment. It does not include collimation screws. It relies on the high machining tolerances of both the Feather Touch focuser and the Takahashi accessory to ensure orthogonality. If you require tilt adjustment, you would need a separate tilt adjuster elsewhere in your imaging train.