Home · Astrophotography · Camera Adapters Astro-Tech 1" extension ring for A-T Ritchey-Chrétien astrographs This Astro-Tech 1” long extension ring, installed between an Astro-Tech Ritchey-Chrétien astrograph and its focuser, helps you match the back focus required for your particular complement of imaging components. Astro-Tech 2" extension ring for A-T Ritchey-Chrétien astrographs This Astro-Tech 2” long extension ring, installed between an Astro-Tech Ritchey-Chrétien astrograph and its focuser, helps you match the back focus required for your particular complement of imaging components. Astro-Tech 2" prime focus adapter, needs T-ring The Astro-Tech 2” prime focus adapter allows unvignetted prime focus photography with most reflectors and refractors equipped with a 2” focuser. Astro-Tech 35mm extension tube The Astro-Tech 35mm extension tube can be used when imaging to make up for the loss of light path when a 2” star diagonal is removed from many refractor focusers and replaced by a camera and camera adapter for imaging. It can also be used with Astro-Tech Ritchey-Chrétien reflectors to bring webcams and DSLRs to the correct focus. Astro-Tech 50mm extension tube The Astro-Tech 50mm extension tube is used to make up for the loss of light path when a 2” star diagonal is removed from many refractor focusers and replaced by a camera and camera adapter for imaging. It can also be used with Astro-Tech Ritchey-Chrétien reflectors to bring webcams and DSLRs to the correct focus. Astro-Tech 80mm extension tube The Astro-Tech 80mm extension tube is used to make up for the loss of light path when a 2” star diagonal is removed from many refractor focusers and replaced by a camera and camera adapter for imaging. It can also be used with Astro-Tech Ritchey-Chrétien reflectors to bring webcams and DSLRs to the correct focus.
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