{"product_id":"altair-ha-sii-oiii-dualband-ultra-6nm-filter-combo-1-25","title":"Altair Ha Sii Oiii DualBand ULTRA 6nm Filter COMBO 1.25\"","description":"\u003ch2 style=\"text-align: center;\"\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan style=\"color: #ec0000;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/9904\/6464\/files\/altair-ha-sii-oiii-dualband-ultra-6nm-filter-combo-13496-p.jpg?v=1701544122\" width=\"253\" height=\"253\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Dual-Band Filter Technology\u003c\/strong\u003e: The Altair Dual-Band ULTRA Sii\/Oii is a cutting-edge narrowband filter with a tight 6nm FWHM Bandpass, designed for enhancing nebula imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective Light Pollution Suppression\u003c\/strong\u003e: Incorporates Altair V2 coatings, highly effective against LED light pollution, offering deep blocking factors of OD\u0026gt;6 below 440nm and OD5 in the visual range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExceptional Transmission Rates\u003c\/strong\u003e: Demonstrates impressive transmission rates of 93% for both Oiii (6nm bandwidth) and Sii (5.5nm bandwidth), with precise tolerances of 0.5nm and 0.5%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdeal for Diverse Imaging Conditions\u003c\/strong\u003e: Perfect for imaging in moonlight, light pollution, or dark-sky conditions, providing total channel control in narrowband-style imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertified Individual Testing\u003c\/strong\u003e: Each filter undergoes individual spectrographic testing with 0.1nm true resolution, ensuring authenticity and superior performance, unlike generic test reports from other brands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDualBand Ha\/Oiii Emission Suppression\u003c\/strong\u003e: Transmits only Sii and Oiii light from emission nebulae, effectively suppressing unwanted light, ideal for narrowband Bi-Colour imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Imaging Capabilities\u003c\/strong\u003e: Capture key emission nebulae bands simultaneously while suppressing extraneous light. Compatible with color CMOS cameras for varied imaging scenarios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased Data Acquisition\u003c\/strong\u003e: Acquire more data efficiently, expanding your imaging window, even in challenging conditions like summer nights.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplementary Use with Ha Oiii Filter\u003c\/strong\u003e: Combine with Ha Oiii version for doubled Oiii data capture per session, enabling true SHO Hubble style imaging with color cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteep Bandpass for Maximum Contrast\u003c\/strong\u003e: Features a steep 6nm bandpass for Oiii and 5.5nm for Sii, enhancing contrast in extreme light pollution conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized for Various Telescopes\u003c\/strong\u003e: Performs best at F4.8 or slower focal ratios, but can be used up to F3.6 with minimal contrast impact.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Filter Thread and Specifications\u003c\/strong\u003e: Fits standard M48x0.75mm thread, compatible with various holders and wheels. Specifications include two bands, Oiii and Sii, with 93% transmission and OD5 blocking.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e: Explains the functionality of OSC Narrowband filters, compatibility with different cameras, and the concept of DualBand filtering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability Note\u003c\/strong\u003e: High demand may lead to temporary suspension of orders to maintain production quality. Specifications and prices are subject to change without notice.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSafety Reminder\u003c\/strong\u003e: Always ensure proper solar viewing safety measures when using filters for solar imaging.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch1\u003eSpecifications\u003c\/h1\u003e\n\u003ch2\u003eHA\/Oiii\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e*1st band, Oiii CWL 500.7nm FWHM 6nm ~0.5nm tolerance , T% 93% 0.5% Tolerance.\u003c\/li\u003e\n\u003cli\u003e*2nd band, Ha CWL 656.28nm FWHM 5.5nm ~0.5nm tolerance, T% 93% 0.5% Tolerance.\u003c\/li\u003e\n\u003cli\u003eOD4\/5 Blocking (0.01%~0.001%) over the majority of unwanted wavelengths\u003c\/li\u003e\n\u003cli\u003e1.85mm thick optical glass with 30 arc sec parallelism. Parfocal with other Altair filters.\u003c\/li\u003e\n\u003cli\u003eSi02 \"hard\" overcoat with UVIR Block and Anti-Reflection Coating for durability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eOiii\/Sii\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e*1st band, Oiii CWL 500.7nm FWHM 6nm ~0.5nm tolerance , T% 93% 0.5% Tolerance.\u003c\/li\u003e\n\u003cli\u003e*2nd band, Sii CWL 671.6nm FWHM 5.5nm ~0.5nm tolerance, T% 93% 0.5% Tolerance.\u003c\/li\u003e\n\u003cli\u003eOD5 Blocking (0.001%) over unwanted visual wavelengths\u003c\/li\u003e\n\u003cli\u003e1.85mm thick optical glass with 30 arc sec parallelism. Parfocal with other Altair filters.\u003c\/li\u003e\n\u003cli\u003eSi02 \"hard\" overcoat with UVIR Block and Anti-Reflection Coating for durability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"Altair Astro","offers":[{"title":"Default Title","offer_id":52092657729856,"sku":"F125DB6NM-COMBO","price":337.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/9904\/6464\/files\/altair-ha-sii-oiii-dualband-ultra-6nm-filter-combo-1.25-14439-p.jpg?v=1780700437","url":"https:\/\/astroworldtelescopes.com\/products\/altair-ha-sii-oiii-dualband-ultra-6nm-filter-combo-1-25","provider":"Astroworld Telescopes","version":"1.0","type":"link"}