{"product_id":"like-new-in-box-astronomik-l-2-uv-ir-block-filter-47-2mm-unmounted","title":"Like New in Box Astronomik L-2 UV-IR Block Filter, 47.2mm UNMOUNTED","description":"\u003ch4\u003eCondition:\u003c\/h4\u003e\n\u003cp\u003eThis is a 47.2mm unmounted Astronomik L-2 UV-IR Block filter. It is in pristine, like new condition and comes in its original jewel box.  Save big off of a brand new one!  \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eDescription:\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003eAstronomik offers a range of three different ultraviolet (UV) and infrared (IR) blocking filters for the Luminance channel. These filters are designed to help you tune your setup to produce the sharpest, most contrast-rich images possible. The luminance channel is critical to a great final image because it provides the most signal, which means the filter should have the highest transmission possible with a wide spectral bandpass across the entire visible spectrum. This combination ensures the highest sensitivity and photon counts on your pixels.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHowever, not all optical instruments or additional optical elements like correctors, field-flatteners, or reducers have a perfect color correction. A Luminance filter with too wide a bandpass can show chromatic aberration of the optical system, resulting in soft or bloated stars and making image processing difficult. To address this, Astronomik offers its line of Luminance filters: the L-1 filter with the widest spectral window, the L-2 filter with a standard spectral window, and the L-3 filter with the narrowest spectral window.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDepending on the color errors of the instruments used, the Astronomik Luminance filter with the widest spectral window should be used.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cb\u003eL-1 UV-IR Block filter\u003c\/b\u003e: Ideal for optical systems free of chromatic aberration\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cb\u003eL-2 UV-IR Block filter\u003c\/b\u003e: Suitable for most optical systems with a corrector or flattener\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cb\u003eL-3 UV-IR Block filter\u003c\/b\u003e: Designed for refractors with less-than-perfect color correction to minimize bluish halos around stars\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThe transmission characteristics and coatings on the Astronomik Luminance filters are engineered to eliminate halos and reflections. Even with bright stars in the field of view, nebulae and galaxies are imaged with the finest structures and maximum contrast. \u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e\u003cspan\u003eAdditional note for photographers under light-polluted skies\u003c\/span\u003e\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Astronomik CLS CCD filter is recommended as a replacement for the Astronomik Luminance filter. The Astronomik CLS CCD filter provides approximately the same amount of light in all three color channels while blocking nearly all unwanted light pollution, resulting in much deeper images with much less background noise from light-polluted observing sites.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e\u003cspan\u003eTechnical data\u003c\/span\u003e\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eGlass thickness: 1mm (except Astronomik OWB Type 3 and XT filters)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cspan\u003eFinely polished optical glass, free of any striae, residual stresses, and bubbles\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cspan\u003eExtremely scratch-resistant and durable coating\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cspan\u003eCompletely resistant against high humidity and aging effects\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cspan\u003eAstronomik MFR coating (Astronomik Deep-Sky RGB, UV-IR Block L-1, L-2, L-3, and Narrowband-Emissionline filters)\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cspan\u003eParfocal with other Astronomik filters\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cspan\u003eDiffraction-limited\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cspan\u003eOptimized spectral windows\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: medium;\"\u003e\u003cspan\u003eDelivered in a high-quality, long-lasting filter box\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eDue to the high-precision machining of the carrier substrate, all Astronomik filters are parfocal with wedge errors far below all common tolerances. Astronomik filters are diffraction-limited, ensuring that the optical performance (resolution and contrast) of your telescope is not compromised. Issues concerning focal distances and the exact alignment of images from each color channel are therefore effectively eliminated. \u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAll Astronomik filters are ideal for modern cameras, including both CMOS- and CCD-based models, ensuring you capture the best possible images with your equipment. Sharpness, contrast, and the absence of any reflections and halos are guaranteed. Even with bright stars in the field of view, nebulae and galaxies will be captured with the finest structures. The Astronomik MFR coating is designed for optimal performance across a wide range of focal ratios of the optics used.\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEvery Astronomik filter undergoes a rigorous quality control process before delivery. Additionally, each Astronomik Narrowband-Emissionline filter is measured using a high-end PerkinElmer Spectrophotometer to ensure it meets the specifications published on our website. On the back of each Narrowband-Emissionline filter box, you will find a label detailing the precise spectral data for that specific filter, including the maximum transmission and the recommended range of focal ratios.\u003c\/span\u003e\u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"Default Title","offer_id":49226650976515,"sku":"U2607-MS-UVIRL2UNM","price":85.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/98baf48a-682e-4ac6-948a-b774e9c3ae3f.jpg?v=1783454831","url":"https:\/\/milehighastro.com\/products\/like-new-in-box-astronomik-l-2-uv-ir-block-filter-47-2mm-unmounted","provider":"Mile High Astronomy","version":"1.0","type":"link"}