{"product_id":"zwo-uv-ir-cut-filter-1-25-2-for-colour-imaging","title":"ZWO UV\/IR-Cut Filter – 1.25\" \u0026 2\" for Colour Imaging","description":"\u003cp\u003eThe \u003cstrong\u003eZWO UV\/IR-Cut Filter\u003c\/strong\u003e helps keep unwanted ultraviolet and infrared light out of your astronomical images while retaining the visible-light signal. It is intended for imaging setups that need separate UV\/IR blocking, particularly colour cameras fitted with an AR-coated protective window rather than an integral UV\/IR-cut window.\u003c\/p\u003e\n\u003cp\u003eCamera sensors can record infrared light that your optics do not bring to the same focus as visible light. Blocking that contribution can help improve image sharpness. Choose between \u003cstrong\u003e1.25\" and 2\" mounted formats\u003c\/strong\u003e to suit your filter holder and imaging train.\u003c\/p\u003e\n\u003ch2\u003eChoose the right size\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eVersion\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eManufacturer model\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eMounting details\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e1.25\"\u003c\/th\u003e\n\u003ctd\u003eZWO IRCUT1.25\u003c\/td\u003e\n\u003ctd\u003eMounted 1.25\" filter cell; ZWO specifies 1.85 mm filter thickness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e2\"\u003c\/th\u003e\n\u003ctd\u003eZWO IRCUT2\u003c\/td\u003e\n\u003ctd\u003eM48 × 0.75 male filter thread; ZWO specifies a 5 mm cell plus 2 mm thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe quoted 1.25\" filter thickness and 2\" cell dimensions describe different aspects of the products; do not treat them as equivalent optical glass thicknesses.\u003c\/p\u003e\n\u003ch2\u003eCheck your camera and filter holder\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCheck whether your camera already has UV\/IR blocking built into its protective window before adding another filter.\u003c\/li\u003e\n\u003cli\u003eMatch the mounted filter size to your nosepiece, filter wheel or drawer. Check thread compatibility and clearance, rather than relying on barrel diameter alone.\u003c\/li\u003e\n\u003cli\u003eConsider the sensor size, focal ratio and distance from the sensor when choosing a filter aperture; a smaller filter can restrict the illuminated field in some configurations.\u003c\/li\u003e\n\u003cli\u003eRefocus and check your spacing after changing the optical elements in an imaging train.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat this filter does\u003c\/h2\u003e\n\u003cp\u003eThis is a UV\/IR-cut imaging filter. It is not an infrared-pass filter for infrared-only imaging, and it is not a narrowband or dedicated light-pollution filter.\u003c\/p\u003e\n\u003ch2\u003eSupplied item\u003c\/h2\u003e\n\u003cp\u003eOne mounted ZWO UV\/IR-cut filter in the size selected. ZWO specifies a protective plastic case for the 1.25\" version. Cameras, nosepieces, drawers and filter wheels are sold separately.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhich size should I buy?\u003c\/h3\u003e\n\u003cp\u003eChoose the format supported by your filter holder, then check that its aperture is suitable for your sensor and optical arrangement. A 2\" filter is not a direct fit in a 1.25\" holder.\u003c\/p\u003e\n\u003ch3\u003eWill it improve every camera setup?\u003c\/h3\u003e\n\u003cp\u003eThe benefit depends on whether unwanted UV\/IR light is reaching the sensor and how the optics focus it. An additional filter may be unnecessary if the camera already provides appropriate blocking.\u003c\/p\u003e\n\u003ch3\u003eCan I use it as a solar filter?\u003c\/h3\u003e\n\u003cp\u003eNo. This filter does not make a telescope safe for observing or imaging the Sun.\u003c\/p\u003e\n\u003cp\u003eExplore more \u003ca href=\"https:\/\/www.darkclearskies.co.uk\/pages\/zwo\"\u003eZWO cameras and accessories at Dark Clear Skies\u003c\/a\u003e, or contact us with your camera and filter-holder details for help selecting the format.\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"1.25\"","offer_id":55720771125624,"sku":"ZWO-IRCUT1.25","price":29.0,"currency_code":"GBP","in_stock":true},{"title":"2\"","offer_id":55720771158392,"sku":"ZWO-IRCUT2","price":51.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/zwo-uv-ir-cut-filter-1-25-inch.jpg?v=1793557904","url":"https:\/\/www.darkclearskies.co.uk\/products\/zwo-uv-ir-cut-filter-1-25-2-for-colour-imaging","provider":"Dark Clear Skies ","version":"1.0","type":"link"}