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This series of extensions is designed to utilize the robust 2.7" Astro-Physics thread size, while providing a variety of lengths for use with barlows, telecompressors and camera systems. These extensions can be used in various combinations to achieve the perfect spacing distance for your system.
These extensions thread directly into the drawtube of the 2.7" focuser and into the 4" to 2.7" Adapter (A1024), or its shorter version (A1024-A), which fit the 4" focuser. They feature knife-edge baffles and an interior that is painted flat black to eliminate internal reflections. Accessories with 2" nosepieces can easily be attached by using the ADA2003A, ADA20132, ADA200 (discontinued), or ADA2013 (discontinued) 2" Adapters with Thumbscrews.
Thread-on Extension with the following applications:
The re-design of these extensions include a lip on the outer diameter to prevent the extension from being racked inside the focuser housing.
This extension has a net spacing distance of 0.75" (19.1 mm).