{"product_id":"astronomy-plus-bahtinov-mask","title":"Astronomy Plus Bahtinov mask (TA403)","description":"\u003ch1\u003eAstronomy Plus Bahtinov mask\u003c\/h1\u003e\n\u003cp\u003eThe Bahtinov mask is a precision focusing aid designed for telescopes and astrophotography setups. It produces a diffraction spike pattern on bright stars, allowing users to achieve accurate and repeatable focus in seconds. The mask is supplied in multiple size variants to match different telescope aperture diameters or dew shield outer dimensions, making it suitable for a wide range of optical tubes and imaging systems.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications \u003c\/h3\u003e\n\u003ctable style=\"width: 100%; height: 215.532px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003cth style=\"width: 16.582%; height: 19.5938px;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"width: 80.5609%; height: 19.5938px;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eProduct Type\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eBahtinov focusing mask\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eFunction\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eOptical focusing aid using diffraction spikes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eApplication\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eVisual observation and astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eCompatibility\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eRefractor, reflector, and catadioptric telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eFit Method\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eSized by telescope outer diameter \/ dew shield\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eSize Variants\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eMultiple OD ranges to match different telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eLightweight plastic or laser-cut polymer (varies by version)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eMounting\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eClamp-on \/ screw or strap-based attachment depending on variant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eFeature\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eProduces central diffraction spike alignment for precise focus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 16.582%; height: 19.5938px;\"\u003eUse Case\u003c\/td\u003e\n\u003ctd style=\"width: 80.5609%; height: 19.5938px;\"\u003eBright star focusing for imaging and visual setup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"1vxyq4r\" data-start=\"1212\" data-end=\"1260\"\u003eBahtinov focusing mask (selected size variant)\u003c\/li\u003e\n\u003cli data-section-id=\"e778l7\" data-start=\"1261\" data-end=\"1325\"\u003eMounting hardware (screws \/ clips \/ straps depending on model)\u003c\/li\u003e\n\u003cli data-section-id=\"1vl9kmm\" data-start=\"1326\" data-end=\"1366\"\u003eProtective packaging or storage sleeve\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/astronomyplus.com\/pages\/astronomy-plus-products-warranty\" rel=\"noopener\" target=\"_blank\"\u003eAstronomy Plus limited Warranty\u003c\/a\u003e\u003c\/p\u003e","brand":"Astronomy Plus","offers":[{"title":"60-90mm","offer_id":48996262740197,"sku":"AST-TA403-60","price":27.0,"currency_code":"CAD","in_stock":true},{"title":"80-110mm","offer_id":48996262772965,"sku":"AST-TA403-80","price":28.0,"currency_code":"CAD","in_stock":true},{"title":"100-140mm","offer_id":48996262805733,"sku":"AST-TA403-100","price":29.0,"currency_code":"CAD","in_stock":true},{"title":"140-180mm","offer_id":49038957838565,"sku":"AST-TA403-140","price":27.0,"currency_code":"CAD","in_stock":true},{"title":"180-220mm","offer_id":48996262838501,"sku":"AST-TA403-180","price":33.0,"currency_code":"CAD","in_stock":true},{"title":"200-260mm","offer_id":48996262871269,"sku":"AST-TA403-200","price":34.0,"currency_code":"CAD","in_stock":true},{"title":"230-290mm","offer_id":48996262904037,"sku":"AST-TA403-230","price":36.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/Untitled_7d68a899-5bba-48f3-872b-66925d58ceb0.webp?v=1778348030","url":"https:\/\/astronomyplus.com\/products\/astronomy-plus-bahtinov-mask","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}