What is the main purpose of the Baader 1.25"/T-2 Focusing Eyepiece Holder?
Its primary purpose is to provide fine, independent focus control for a 1.25" accessory within a T-2 threaded system. This is especially useful for achieving sharp focus on a guide camera in an off-axis guider (OAG) or guide scope, or for focusing a reticle eyepiece, without altering the main telescope's focus.
How can I use this Baader holder to focus a guide camera on my finder scope?
If your finder scope has a T-2 thread output, you can attach this holder directly. After achieving rough focus with the finder's main focuser, you insert your 1.25" guide camera into the Baader holder. You can then use the smooth helical mechanism to make very fine adjustments until your guide stars are perfectly sharp, turning a basic finder into a high-precision guide scope.
What is the advantage of the three clampscrews on this Baader T-2 holder?
The three clampscrews, spaced around the barrel, provide a more balanced and secure grip than a single screw. This ensures the eyepiece or camera is held perfectly centered in the optical axis, preventing tilt that can degrade guiding or viewing accuracy.
Does the Baader Focusing Eyepiece Holder add significant length to the optical path?
Yes, like any accessory, it adds to the overall length of your optical train. While the exact length depends on the focus position, you must ensure your telescope has sufficient back focus to accommodate it. This is a critical consideration for systems with limited back focus, such as some Newtonian reflectors.
How does this Baader holder integrate with other T-2 system components?
The Baader T-2 system is a modular set of rings, adapters, and spacers. This focusing holder features standard T-2 (M42x0.75) female threads on the telescope side, allowing it to connect to any other T-2 male thread, such as those on off-axis guiders, filter wheels, or extension tubes. This allows for building custom, rigid imaging trains.
