{"title":"Accessories \u0026 Replacement Parts","description":"\u003cp\u003eReplacement parts and accessories for Bahtinov focus masks and night observing. Spare soft-tip screws for clip-on masks, plus red-beam lighting for preserving night vision at the eyepiece.\u003c\/p\u003e","products":[{"product_id":"replacement-screws-with-soft-tips-for-bahtinov-focus-tools","title":"Replacement Screws with Soft Tips for Bahtinov Masks (3-Pack)","description":"\u003cp\u003eLost a screw from your Bahtinov mask? This three-pack of replacement soft-tip screws gets your focus mask back in service without replacing the whole mask.\u003c\/p\u003e\n\u003cp\u003eEach screw has a soft tip that lets you tighten the mask against your lens barrel or telescope tube without scratching or denting the finish.\u003c\/p\u003e\n\u003ch3\u003eWhat's included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3 replacement screws with soft tips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 3 screws per pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTip type:\u003c\/strong\u003e Soft, non-marring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Johannes Scientific\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 515150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping weight:\u003c\/strong\u003e 0.2 oz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThese screws fit all clip-on Bahtinov mask variants from Johannes Scientific. Clip-on masks are the models that attach with adjustable arms tightened by hand and are sized by a millimeter range, such as 60-90 mm, 80-120 mm, or 100-160 mm, rather than by a single fixed diameter.\u003c\/p\u003e\n\u003cp\u003eThey are not used with threaded or magnetic filter-style masks, such as the Kase Bright Star Bahtinov filter, which screw onto the filter thread of a lens and use no clamping hardware.\u003c\/p\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow many screws come in a pack?\u003c\/strong\u003e\u003cbr\u003eThree.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill these fit my Bahtinov mask?\u003c\/strong\u003e\u003cbr\u003eIf your mask clips on with adjustable arms and is sized by a millimeter range, yes. If it threads onto your lens or attaches magnetically, no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy do the screws have soft tips?\u003c\/strong\u003e\u003cbr\u003eThe soft tip grips your lens barrel or telescope tube firmly without scratching the finish, which matters when you are tightening a mask by feel in the dark.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I buy a single screw?\u003c\/strong\u003e\u003cbr\u003eThey are sold in packs of three so you have spares on hand for future nights out.\u003c\/p\u003e","brand":"Johannes Scientific","offers":[{"title":"Default Title","offer_id":39370860495023,"sku":"515150","price":5.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0289\/4967\/6165\/products\/ScrewReplacements.jpg?v=1615701365"},{"product_id":"powersight-670nm-red-beam-flashlight-ultimate-astronomy-hunting-light","title":"Red LED Astronomy Flashlight - 670nm Night Vision Light","description":"\u003cp\u003eWhite light undoes twenty to thirty minutes of dark adaptation in about a second. That is the problem this flashlight solves. A deep red beam at 670 nm lets you find a dropped eyepiece, check a focuser, or read a star chart without resetting your eyes and starting the wait all over again.\u003c\/p\u003e\n\u003cp\u003eThe body is aluminum alloy with cooling grooves cut along the barrel. The head zooms from a wide pool of light down to a tighter beam, and a clip on the barrel keeps it in a pocket or on a strap instead of lost in the grass.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWavelength:\u003c\/strong\u003e 670 nm deep red\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBody:\u003c\/strong\u003e Aluminum alloy with cooling grooves\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBeam:\u003c\/strong\u003e Adjustable zoom, wide to narrow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower:\u003c\/strong\u003e One AA battery, not included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2 oz\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eWater resistant\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCarry:\u003c\/strong\u003e Pocket clip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Johannes Scientific\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy red light\u003c\/h3\u003e\n\u003cp\u003eYour eyes need roughly twenty to thirty minutes in the dark to reach full sensitivity. The rod cells responsible for low-light vision respond far less to long-wavelength red light than to white or blue, so a red beam lets you see what you are doing while leaving most of your dark adaptation intact. It is why observatory floors, star parties, and astrophotography sessions all run on red.\u003c\/p\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhy a 670 nm red LED instead of a red filter over a white light?\u003c\/strong\u003e\u003cbr\u003eA filtered white light still leaks shorter wavelengths through the filter. A dedicated red LED only emits in the deep red band, so there is nothing to leak.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat battery does it take?\u003c\/strong\u003e\u003cbr\u003eOne AA battery, which is not included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it for anything besides astronomy?\u003c\/strong\u003e\u003cbr\u003eYes. Red light is standard for night hunting, wildlife observation, and camping, or anywhere you need to see without blinding the people around you.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it hold up to dew and damp?\u003c\/strong\u003e\u003cbr\u003eThe aluminum body is water resistant, which covers the dew, damp grass, and light rain that a night session usually involves.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it work with a Bahtinov mask?\u003c\/strong\u003e\u003cbr\u003eIt pairs well with one. Fitting a mask and dialing in focus is exactly the kind of hands-on task that would otherwise cost you your dark adaptation.\u003c\/p\u003e","brand":"Johannes Scientific","offers":[{"title":"Default Title","offer_id":44167479853231,"sku":"3256805740960842","price":9.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0289\/4967\/6165\/files\/1.jpg?v=1720984198"}],"url":"https:\/\/bahtinovmask.com\/collections\/accessories-replacement-parts.oembed","provider":"Johannes Scientific","version":"1.0","type":"link"}