{"product_id":"irdk20-telescope","title":"PlaneWave IRDK20 F\/6.8 OTA","description":"\u003cp data-start=\"196\" data-end=\"275\"\u003e\u003cstrong data-start=\"196\" data-end=\"275\"\u003ePlaneWave IRDK20 – 20-Inch Infrared-Optimized Dall-Kirkham Telescope System\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"277\" data-end=\"677\"\u003eThe IRDK20 from PlaneWave Instruments is a finely tuned infrared-optimized telescope, designed for advanced research and imaging applications where thermal stability and high reflectivity in non-visible wavelengths are essential. Featuring gold-coated fused silica mirrors and a precision-corrected Dall-Kirkham optical design, the IRDK20 delivers exceptional image fidelity in the infrared spectrum.\u003c\/p\u003e\n\u003cp data-start=\"679\" data-end=\"1009\"\u003eWith a 20-inch aperture and a fully corrected optical path, this system is ideal for institutions conducting space science, atmospheric sensing, and remote infrared imaging. The robust carbon fiber tube ensures minimal thermal expansion, making the IRDK20 a reliable platform for long-duration or thermally sensitive observations.\u003c\/p\u003e\n\u003chr data-start=\"1011\" data-end=\"1014\"\u003e\n\u003cp data-start=\"1016\" data-end=\"1038\"\u003e\u003cstrong data-start=\"1016\" data-end=\"1038\"\u003eKey Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1040\" data-end=\"1443\"\u003e\u003cstrong data-start=\"1040\" data-end=\"1059\"\u003eOptical Design:\u003c\/strong\u003e Infrared-optimized Dall-Kirkham (IRDK)\u003cbr data-start=\"1098\" data-end=\"1101\"\u003e\u003cstrong data-start=\"1101\" data-end=\"1120\"\u003eClear Aperture:\u003c\/strong\u003e 508mm (20 in)\u003cbr data-start=\"1134\" data-end=\"1137\"\u003e\u003cstrong data-start=\"1137\" data-end=\"1153\"\u003eFocal Ratio:\u003c\/strong\u003e f\/6.8\u003cbr data-start=\"1159\" data-end=\"1162\"\u003e\u003cstrong data-start=\"1162\" data-end=\"1179\"\u003eFocal Length:\u003c\/strong\u003e 3454mm\u003cbr data-start=\"1186\" data-end=\"1189\"\u003e\u003cstrong data-start=\"1189\" data-end=\"1204\"\u003eBack Focus:\u003c\/strong\u003e 224mm from mounting surface\u003cbr data-start=\"1232\" data-end=\"1235\"\u003e\u003cstrong data-start=\"1235\" data-end=\"1252\"\u003eImage Circle:\u003c\/strong\u003e 52mm\u003cbr data-start=\"1257\" data-end=\"1260\"\u003e\u003cstrong data-start=\"1260\" data-end=\"1279\"\u003eMirror Coating:\u003c\/strong\u003e Gold (optimized for IR; UV coating optional)\u003cbr data-start=\"1324\" data-end=\"1327\"\u003e\u003cstrong data-start=\"1327\" data-end=\"1347\"\u003eMirror Material:\u003c\/strong\u003e Fused silica – low thermal expansion\u003cbr data-start=\"1384\" data-end=\"1387\" data-is-only-node=\"\"\u003e\u003cstrong data-start=\"1387\" data-end=\"1404\"\u003eOTA Material:\u003c\/strong\u003e Carbon fiber – lightweight and rigid\u003c\/p\u003e\n\u003chr data-start=\"1445\" data-end=\"1448\"\u003e\n\u003cp data-start=\"1450\" data-end=\"1480\"\u003e\u003cstrong data-start=\"1450\" data-end=\"1480\"\u003ePerformance \u0026amp; Applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1482\" data-end=\"1699\"\u003e\u003cstrong data-start=\"1482\" data-end=\"1516\"\u003e- Infrared Research \u0026amp; Imaging:\u003c\/strong\u003e\u003cbr data-start=\"1516\" data-end=\"1519\"\u003eGold-coated mirrors ensure high reflectivity across the infrared spectrum, enabling precise data collection for space science, environmental monitoring, and defense applications.\u003c\/p\u003e\n\u003cp data-start=\"1701\" data-end=\"1907\"\u003e\u003cstrong data-start=\"1701\" data-end=\"1738\"\u003e- Thermal \u0026amp; Structural Stability:\u003c\/strong\u003e\u003cbr data-start=\"1738\" data-end=\"1741\"\u003eFused silica mirrors and carbon fiber construction significantly reduce thermal expansion, preserving optical alignment and image focus in fluctuating temperatures.\u003c\/p\u003e\n\u003cp data-start=\"1909\" data-end=\"2102\"\u003e\u003cstrong data-start=\"1909\" data-end=\"1944\"\u003e- Wide IR Sensor Compatibility:\u003c\/strong\u003e\u003cbr data-start=\"1944\" data-end=\"1947\"\u003e52mm image circle supports large-format IR detectors, ensuring edge-to-edge sharpness and high SNR performance in long-exposure or narrowband IR imaging.\u003c\/p\u003e\n\u003cp data-start=\"2104\" data-end=\"2312\"\u003e\u003cstrong data-start=\"2104\" data-end=\"2141\"\u003e- Remote Observatory Integration:\u003c\/strong\u003e\u003cbr data-start=\"2141\" data-end=\"2144\"\u003eThe lightweight, robust OTA design is ideal for remote deployments and integration into professional-grade automated observatories or satellite communication systems.\u003c\/p\u003e","brand":"PlaneWave Instruments","offers":[{"title":"Default Title","offer_id":49937788666144,"sku":"200120Q","price":45000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/2135\/2480\/files\/image_2025-09-16_103234664.png?v=1758043954","url":"https:\/\/firstlightastro.com\/products\/irdk20-telescope","provider":"First Light Astro","version":"1.0","type":"link"}