Why do I need this 19mm M36.5 extension for my Alan Gee II on a Celestron 8" SCT?
On a C8, the Alan Gee II corrector must be recessed inside the main baffle tube to reach the correct working distance for optimal performance. This 19mm extension provides the exact spacing required, while its thin-walled M36.5 design allows it to physically fit where a standard T-2 extension cannot.
Can I use this 19mm M36.5 extension to connect my Alan Gee II to a T-2 filter wheel?
No. This extension uses a proprietary M36.5 thread and is not compatible with the standard T-2 (M42x0.75) system. It is designed exclusively for spacing the Alan Gee II telecompressor itself.
What problem does the 19mm M36.5 extension solve for the Alan Gee II?
It solves the critical spacing problem in Schmidt-Cassegrain telescopes. Without this extension, the Alan Gee II corrector is positioned too far from the focal plane, which can lead to poor optical correction, especially at the edge of the field of view.
Is the 19mm M36.5 extension tube compatible with other telecompressors?
No, this is a dedicated part designed specifically for the Baader Alan Gee II Telecompressor. Its unique M36.5 thread and dimensions are not intended for use with other optical accessories.
I lost an extension for my Alan Gee II, is this the correct replacement?
Yes. The Alan Gee II system uses extensions like this to achieve different reduction factors and proper spacing. This 19mm tube is an original Baader component for replacing a lost part or for experimenting with custom spacing configurations.
Where can I find instructions for using the 19mm M36.5 extension tube?
Detailed instructions, including diagrams showing how to configure the extensions for different reduction factors, can be found in the official manual for the Alan Gee II Telecompressor.
