Product Description: These Optical Tube Assemblies provide both high resolution imaging performance and the good light grasp of a 10 inch aperture. Because the tubes are fully enclosed and fitted with internal light baffles (coated with our proprietary Deep Sky Black^TM low reflectivity surface coating), these telescopes offer exceptionally high image contrast. The 10-in. Alpha Draconis OTA is offered in Standard Achromatic and Full Apochromatic versions. All optical elements are fabricated from precision annealed Schott Grade A optical glass blanks and are hand figured by laser autocollimation testing against a NIST certified optical flat mirror in our own USA facilities. Both versions incorporate fully adjustable objective cell assemblies, 2-stage coarse/fine focussers with squaring-on adjustments and a 120 mm aperture refractor finder/guide telescope. The OTA structure consists of a center section mated to flanged objective and tailpiece tube sections. The objective lens is shielded by a baffled dewcap/lightshade extension tube. An adjustable longitudinal trim weight is provided for fine balance compensation of focal plane accessories.

10-in. Alpha Draconis Achromatic OTA: $32,355, FOB Pinecliffe, Colorado USA. Completion within 5 months of receipt of order. An initial deposit of 50% is required with the order.

10-in. Alpha Draconis Apochromatic OTA: $91,280, FOB Pinecliffe, Colorado USA. Completion within 12 months of receipt of order. An initial deposit of 50% is required with the order.