Baader Variable Locking/Sliding T-2 Focuser

An OAG requires the guide camera to be perfectly parfocal with the main imaging camera. The Baader Sliding T-2 Focuser allows you to make fine adjustments to the guide camera's position to achieve this critical focus alignment. Once set, you can lock it down securely.

Yes. This is an excellent application for this component. You can use the Baader Sliding Focuser in your T-2 train to fine-tune the total distance to the required 55mm, ensuring your coma corrector delivers the best possible performance across the entire sensor of your camera.

A sliding focuser generally offers a more straightforward and compact design for setting a specific distance and locking it. Helical focusers provide more precise, repeatable focus adjustments via a rotating collar, but can be larger and more complex. For "set-and-forget" applications like initial guide camera focusing or setting back focus, the sliding focuser is often a more direct solution.

The setting is held by an M4 clamping screw and an M4 locking screw (Baader: screw clamps). Tighten them once focus is set; for heavy loads a fixed extension tube is the more rigid choice.

This focuser is part of the Baader Astro T-2 System and uses T-2 threads (M42x0.75) on both its male and female connections. This ensures full compatibility with a vast range of adapters, extension tubes, and accessories within that system.

The Baader Sliding Focuser is primarily designed for lightweight accessories like guide cameras, eyepieces for guide ports, or as a spacing adjuster within a well-supported imaging train. While the screw clamps hold the setting, for heavy, cantilevered loads, a more rigid connection like a fixed extension tube is recommended to eliminate any possibility of flexure.