by Astronomy Technologies
Date first available at Amazon.com: September 22, 2011
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Review & Description
Astro Tech Extension Tube for 2" Focusers - 50mm Extension - Astro Tech part # AT50EXT
This Astro-Tech 50mm long x 2" diameter extension tube can be used to make up for the loss of light path when a 2" star diagonal is removed from many refractor telescope focusers and replaced by a camera and camera adapter for imaging.
One end of this Astro-Tech 2" diameter x 50mm long extension tube fits into 2" focuser drawtubes. This end is threaded to accept 48mm filters. A shallow safety groove is machined into the barrel of the extension tube. This groove engages the thumbscrew or compression ring of your focuser to prevent the extension tube and your camera from falling should the focuser thumbscrew loosen accidentally during use. The barrel extends 35mm into the focuser drawtube to provide a secure tilt-free installation when the focuser thumbscrew is firmly tightened.
The opposite end of the extension tube has a 2" diameter accessory holder that uses a non-marring brass clamp ring to hold 2" accessories in place. This accessory holder adds 50mm of extension to the light path when the extension tube is seated firmly into your focuser. The overall length of the extension tube is 85mm, 35mm extending into your focuser with 50mm of external light path extension. The extension tube is machined of aluminum, anodized black. The interior has anti-reflection threading.
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