{"product_id":"planewave-20-inch-rc-optical-tube-200125q","title":"PlaneWave 20 Inch RC Optical Tube (200125Q)","description":"\u003ch2\u003ePlaneWave 20 Inch RC Optical Tube\u003c\/h2\u003e\u003cp\u003eThe PlaneWave Instruments PW20-RC is a 20-inch (0.51 m) f\/6.8 Ritchey-Chrétien (RC) Astrograph telescope. The PW20-RC has a dual carbon-fiber truss design, with 3 cooling fans ejecting air from the back of the telescope. The instrument weight is 140 lbs (64 kg) and comes standard with a back plate retaining ring ready to accept the focuser of your choice.\u003c\/p\u003e\u003cp\u003ePlaneWave Instruments is pleased to offer the PW20-RC, a 20 inch (0.51 m) telescope with Ritchey-Chrétien optics. PlaneWave’s CDK astrographs have become the telescopes of choice for universities, industry, and astrophotographers around the world, and now PlaneWave offers the PW-RC series to meet the custom needs of the scientific community.\u003c\/p\u003e\u003cp\u003eThe PW20-RC in its native format (no field flattening lenses) uses only a primary and secondary mirror with reflective coatings. This can be useful when making observations primarily on-axis and wide field imaging is not a concern.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cp\u003e \u003c\/p\u003e\u003ch4\u003eOptical System\u003c\/h4\u003e\u003cp\u003e   Optical Design Ritchey-Chrétien (RC)   Aperture 20 inch (508 mm)   Focal Length 3454 mm (135.98 inch)   Focal ratio F\/6.8   Central Obstruction 39% of the Primary Mirror Diameter   Back Focus from Racked in Focuser 5.8 inch (147 mm)   Weight 140 lbs (63.5 kg)   OTA Length 47 inch (1,194 mm)   Upper Cage Carbon Fiber Truss   Lower Cage Carbon Fiber Truss with Carbon Fiber Light Shroud    \u003c\/p\u003e\u003ch4\u003eSecondary Mirror\u003c\/h4\u003e\u003cp\u003e   Diameter 7.5 inch (191mm)   Material Fused Silica   Shape Hyperbolic   Coating Enhanced Aluminum – 96%   \u003c\/p\u003e\u003ch4\u003ePrimary Mirror\u003c\/h4\u003e\u003cp\u003e   Optical Diameter 20 inch (508 mm)   Outer Diameter 20.5 inch (521 mm)   Shape Hyperbolic   Material Fused Silica   Coating Enhanced Aluminum – 96%    \u003c\/p\u003e\u003ch4\u003eShipping Crate\u003c\/h4\u003e\u003cp\u003e   Crated Shipping Weight 291 lbs (132.0 kg)   Crate Width 32 inch (813 mm)   Crate Height 36 inch (914 mm)   Crate Length 59 inch (1,499 mm)    \u003c\/p\u003e\u003ch3\u003eIn the Box\u003c\/h3\u003e\u003cp\u003e   Primary Mirror Cover The Primary Mirror Cover protects the primary mirror.   Printed Instructions For Collimation and Spacing   12VDC Power Supply (18778) Provides power for the fans (Not included for European Orders)   Wrench Set (5812A35 ) English Hex Wrenches (European Orders Only)    \u003c\/p\u003e\u003ch3\u003eManuals \u0026amp; Warranty\u003c\/h3\u003e\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/planewave-warranty\" target=\"_blank\" title=\"null\"\u003ePlanewave Warranty (One year for optical coatings and Two years mechanics and electronics from the date of delivery)\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e","brand":"Planewave","offers":[{"title":"Default Title","offer_id":44356440326373,"sku":"PW-200125Q","price":93720.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/planewave-20-inch-rc-optical-tube-200125q-astronomy-plus-1.jpg?v=1715808580","url":"https:\/\/istronomyplus.com\/products\/planewave-20-inch-rc-optical-tube-200125q","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}