{"product_id":"optolong-1-25ft-uv-ir-cut-filter-for-ccd-digital-astrophotography","title":"OPTOLONG 1.25ft UV\/IR Cut Filter for CCD Digital Astrophotography","description":"\u003cp\u003eIn this review the OPTOLONG 1.25' UV\/IR Cut Filter is assessed as a practical, no-nonsense accessory for CCD astrophotography. It is aimed at amateur and advanced hobbyist imagers who need a simple way to remove unwanted ultraviolet and infrared contamination without altering optical performance. The single biggest reason to consider this filter is its targeted transmission: very high pass efficiency across key emission lines (including H-beta, OIII and H-alpha) while providing comprehensive blocking of troublesome wavelengths, which translates to cleaner color balance and sharper narrowband detail on CCD cameras.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh transmission at H-beta:\u003c\/strong\u003e The filter passes 96% at 486nm so H-beta features remain bright and well defined in CCD captures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong OIII throughput:\u003c\/strong\u003e With 95% transmission at 496nm and 92.5% at 501nm, OIII emission is preserved for contrast in planetary nebulae and emission regions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcellent H-alpha response:\u003c\/strong\u003e A 98% transmission at 656nm helps preserve the brightest red emission without sacrificing detail.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual pass ranges:\u003c\/strong\u003e The filter passes light from about 450 to 520nm and from 620nm upward, which supports key visual and imaging bands while excluding interfering bands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable coatings and material:\u003c\/strong\u003e Scratch-resistant, humidity and aging resistant glass with hardened multi-coatings keeps the filter stable over time and maintains image quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis filter is best for CCD astrophotographers using refractors or small to medium telescopes who want a simple way to cut UV\/IR and boost contrast on emission-line targets. It is particularly useful for those capturing nebulae and deep sky objects where H-beta, OIII and H-alpha contribute to the structure and color balance.\u003c\/p\u003e\n\u003cp\u003eThose seeking variable narrowband isolation or filters optimized for broadband DSLR imaging may want to consider alternate filters; this product is specialized for CCD systems and for maintaining parfocal alignment with other Optolong filters in a research or imaging workflow.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh transmission on key emission lines gives bright, contrasty nebular detail.\u003c\/li\u003e\n\u003cli\u003eComplete blocking of unwanted wavelengths reduces color contamination from UV and IR.\u003c\/li\u003e\n\u003cli\u003eDurable, scratch-resistant glass and coatings resist humidity and aging for long-term use.\u003c\/li\u003e\n\u003cli\u003eParfocal with other Optolong filters, simplifying filter swaps during imaging sessions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot a replacement for specialized narrowband filters when extreme isolation of one line is required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter type\u003c\/td\u003e\n\u003ctd\u003eUV\/IR cut for CCD astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount size\u003c\/td\u003e\n\u003ctd\u003e1.25' filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass thickness\u003c\/td\u003e\n\u003ctd\u003e1.85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmission highlights\u003c\/td\u003e\n\u003ctd\u003e96% at 486 nm, 95% at 496 nm, 92.5% at 501 nm, 98% at 656 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePass bands\u003c\/td\u003e\n\u003ctd\u003eApproximately 450-520 nm and 620 nm upward\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurability\u003c\/td\u003e\n\u003ctd\u003eScratch-resistant, humidity and aging resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackaging\u003c\/td\u003e\n\u003ctd\u003eHigh-quality, long-lasting filter box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe OPTOLONG 1.25' UV\/IR Cut Filter is a well-built, practical tool for CCD imagers who need reliable UV and IR suppression without compromise to optical performance. Its high transmission at H-beta, OIII and H-alpha plus durable coatings make it good value for users focused on emission-line deep sky imaging using small telescopes or refractors.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this reduce image sharpness?\u003c\/strong\u003e\u003cbr\u003eThe filter is diffraction limited and designed not to reduce optical performance, so image sharpness should be preserved.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it suitable for DSLR sensors?\u003c\/strong\u003e\u003cbr\u003eIt is optimized for CCD astrophotography; DSLRs may benefit but specialized broadband or narrowband DSLR filters could be preferable depending on use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it resist humidity and aging?\u003c\/strong\u003e\u003cbr\u003eYes, the filter is completely resistant against high humidity, scratches and aging effects according to the manufacturer.\u003c\/p\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":48670926962907,"sku":"B09Y1L5YXD","price":44.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51ikDBvYidL._AC_SL1500.jpg?v=1778660942","url":"https:\/\/gearmusthave.com\/products\/optolong-1-25ft-uv-ir-cut-filter-for-ccd-digital-astrophotography","provider":"GearMustHave","version":"1.0","type":"link"}