{"product_id":"rb-focus-newton-telescope-fan-mount","title":"RB-Focus Newton Telescope Fan Mount","description":"\u003ch1\u003eRB-Focus Newton Telescope Fan Mount\u003c\/h1\u003e\n\u003cp\u003eThe RB-Focus fan mount gives a Newtonian reflector a proper place to fit a 92 mm computer fan at the back of the tube. It holds the fan over the rear opening so air moves across the primary mirror, bringing the telescope to thermal stability faster and keeping dust out of the open structure.\u003c\/p\u003e\n\u003ch2\u003eTube currents, not seeing\u003c\/h2\u003e\n\u003cp\u003eWhat spoils a surprising number of images is not the atmosphere but the warm air still sitting inside the tube. After a telescope is assembled the mirror is usually warmer than its surroundings, and the currents it sets off linger for a long time, softening the image exactly when the night is at its best. A fan at the back of the tube breaks up that layer and pulls the optics towards ambient temperature quickly, so the wait for the equipment to settle becomes short instead of the usual hour of watching the stars boil.\u003c\/p\u003e\n\u003ch2\u003eKeeps dust out of the tube\u003c\/h2\u003e\n\u003cp\u003eNewtonians are open at the front, which makes them effective at gathering light but equally effective at gathering dust. By keeping air moving through the rear of the tube, the fan mount also helps stop dust from settling on the primary mirror between sessions, so the optics stay cleaner for longer and need fewer interventions.\u003c\/p\u003e\n\u003ch2\u003eFits the usual apertures\u003c\/h2\u003e\n\u003cp\u003eThe mount is supplied in versions for 150 mm and 200 mm apertures, with a 250 mm size also offered, and it comes with a protection grid so nothing can reach the fan blades. It is a small, reversible addition: the mount bolts to the rear of the tube, the fan is fitted to it, and the telescope itself is left unchanged.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eRB-Focus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct type\u003c\/td\u003e\n\u003ctd\u003eFan mount for Newtonian reflector telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended fan size\u003c\/td\u003e\n\u003ctd\u003e92 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable sizes\u003c\/td\u003e\n\u003ctd\u003e150 mm, 200 mm, 250 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eProtection grid included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x RB-Focus fan mount\u003c\/li\u003e\n\u003cli\u003e1 x Protection grid\u003c\/li\u003e\n\u003cli\u003eFan not included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/rb-focus-warranty\" target=\"_blank\" rel=\"noopener\"\u003eRB Focus 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"RBFocus","offers":[{"title":"150mm \/ Yes \/ Forks","offer_id":68167227146469,"sku":"RBF-RBFA02-150-Fan-Forks","price":154.0,"currency_code":"CAD","in_stock":true},{"title":"150mm \/ Yes \/ No","offer_id":68167227179237,"sku":"RBF-RBFA02-150-Fan","price":130.0,"currency_code":"CAD","in_stock":true},{"title":"150mm \/ No \/ Forks","offer_id":68167227212005,"sku":"RBF-RBFA02-150-Forks","price":122.0,"currency_code":"CAD","in_stock":true},{"title":"150mm \/ No \/ No","offer_id":68167227244773,"sku":"RBF-RBFA02-150","price":97.0,"currency_code":"CAD","in_stock":true},{"title":"200mm \/ Yes \/ Forks","offer_id":68167227277541,"sku":"RBF-RBFA02-200-Fan-Forks","price":154.0,"currency_code":"CAD","in_stock":true},{"title":"200mm \/ Yes \/ No","offer_id":68167227310309,"sku":"RBF-RBFA02-200-Fan","price":130.0,"currency_code":"CAD","in_stock":true},{"title":"200mm \/ No \/ Forks","offer_id":68167227343077,"sku":"RBF-RBFA02-200-Forks","price":122.0,"currency_code":"CAD","in_stock":true},{"title":"200mm \/ No \/ No","offer_id":68167227375845,"sku":"RBF-RBFA02-200","price":97.0,"currency_code":"CAD","in_stock":true},{"title":"250mm \/ Yes \/ Forks","offer_id":68167227408613,"sku":"RBF-RBFA02-250-Fan-Forks","price":186.0,"currency_code":"CAD","in_stock":true},{"title":"250mm \/ Yes \/ No","offer_id":68167227441381,"sku":"RBF-RBFA02-250-Fan","price":162.0,"currency_code":"CAD","in_stock":true},{"title":"250mm \/ No \/ Forks","offer_id":68167227474149,"sku":"RBF-RBFA02-250-Forks","price":154.0,"currency_code":"CAD","in_stock":true},{"title":"250mm \/ No \/ No","offer_id":68167227506917,"sku":"RBF-RBFA02-250","price":130.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/1_9316b678-6358-443b-940d-e174c628c125.webp?v=1794687814","url":"https:\/\/astronomyplus.com\/products\/rb-focus-newton-telescope-fan-mount","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}