What is the main purpose of the Baader 2" SCT/T-2 Adapter?
Its primary function is to connect a telescope with a standard 2" Schmidt-Cassegrain rear thread to an accessory or camera that uses the T-2 (M42x0.75) thread standard. Crucially, it also allows you to mount a 2" filter inside the adapter itself, integrating filtration into your system.
How would I use this Baader adapter with my Celestron 8" SCT and a ZWO camera?
You would first thread a 2" filter (like a UV/IR Cut filter) into the adapter. Then, screw the adapter's larger SCT thread onto the rear cell of your 8" SCT. Finally, connect the T-2 thread on the adapter to your ZWO camera's T-2 ring or any other T-2 spacers in your imaging train to achieve the correct back focus.
Can this Baader adapter hold any 2" filter?
Yes, it is designed with standard M48x0.75 female threads internally, which is the universal standard for all 2" mounted astronomical filters from any manufacturer.
Why would I use this Baader adapter instead of a filter wheel or filter drawer?
This adapter is ideal when you need a rigid, compact, and simple solution for using a single filter for an entire session. It has fewer moving parts and introduces less potential flexure than a filter wheel or drawer, making it an excellent choice for portable setups or when minimizing optical path length is critical.
I want to image the Orion Nebula (M42) with my Meade SCT. Which filter would I put in this Baader adapter?
For the Orion Nebula (M42) from a light-polluted area, an excellent choice would be a multi-bandpass nebula filter like a UHC (Ultra High Contrast) or a dual-band filter that passes H-alpha and OIII wavelengths. You would thread this 2" filter directly into the Baader adapter for enhanced contrast.
Are both threads on this Baader adapter male?
Yes. The adapter features a male 2" SCT thread to screw into a female SCT rear cell or accessory port, and a male T-2 thread to screw into a female T-2 ring on a camera, off-axis guider, or other T-2 system component.
