Astronomik L-2 UV-IR Block 1,25" (M28,5)
€75.00
Available, delivery time: 2-5 days
Product information "Astronomik L-2 UV-IR Block 1,25" (M28,5)"
Astronomik 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.
However, 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.
Depending on the color errors of the instruments used, the Astronomik Luminance filter with the widest spectral window should be used.
- L-1 UV-IR Block filter: Ideal for optical systems free of chromatic aberration
- L-2 UV-IR Block filter: Suitable for most optical systems with a corrector or flattener
- L-3 UV-IR Block filter: Designed for refractors with less-than-perfect color correction to minimize bluish halos around stars
The 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.
Additional note for photographers under light-polluted skies
The 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.
Technical data
- Glass thickness: 1mm (except Astronomik OWB Type 3 and XT filters)
- Finely polished optical glass, free of any striae, residual stresses, and bubbles
- Extremely scratch-resistant and durable coating
- Completely resistant against high humidity and aging effects
- Astronomik MFR coating (Astronomik Deep-Sky RGB, UV-IR Block L-1, L-2, L-3, and Narrowband-Emissionline filters)
- Parfocal with other Astronomik filters
- Diffraction-limited
- Optimized spectral windows
- Delivered in a high-quality, long-lasting filter box
Due 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.
All 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.
Every 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.
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Matching Deep-Sky RGB filter set
Astronomik offers a high-end series of RGB filters: the Astronomik Deep-Sky RGB filters are specifically designed to meet the needs of modern astrophotographers, delivering maximum image quality with all CMOS and CCD cameras. Use the Astronomik Deep-Sky RGB filter set to achieve images with unparalleled sharpness, contrast range, and vibrant colors.These filters are recommended for all modern CMOS and CCD cameras from companies such as ZWO/ASI, QHY, QSI, SBIG, ATIK, and ALTAIR. If you aim to capture the most beautiful images with your equipment, the Astronomik Deep-Sky RGB filters are the perfect choice!The Astronomik Deep-Sky RGB filters are the result of extensive, years-long research and development. We are proud to offer you the best RGB filters currently available for deep-sky imaging. The transmission range of these three filters is designed to allow the important emission lines in deep-sky photography to pass through, providing strong signals and vivid colors. Raw images captured with the Astronomik Deep-Sky RGB filter set can be easily combined into a stunning composite.Feedback from our customers has been extremely positive, mutually reporting smaller, sharper star images compared to conventional filters. This aligns with one of our primary development goals: achieving the highest contrast with pinpoint star images.During the development and testing of the Astronomik Deep-Sky RGB filters, we focused on the sensitivity curves of popular cameras used by modern astrophotographers. Instead of relying on manufacturer specifications, we conducted extensive measurements in our development lab. The result is excellent, balanced color reproduction and the best color contrast with all common sensors. The transmission characteristics and coating technology of the Astronomik Deep-Sky RGB filters ensure that no halos or reflections are visible. Even with bright stars in the field of view, nebulae and galaxies will be captured with the finest structures.In addition to the Astronomik Deep-Sky RGB filters, we offer three different Luminance filters (Astronomik L-1, L-2 and L-3 UV-IR Block). The different transmission ranges of each Luminance filter are designed to match the color correction of different telescopes in order to obtain the sharpest image with any optical design and camera, even with instruments with less-than-perfect color correction. Gallery of images taken with our Astronomik Deep-Sky RGB filters Additional note for photographers and observers under light-polluted skiesFor those working under light-polluted skies, consider using the Astronomik CLS CCD filter instead of a Luminance filter. The Astronomik CLS CCD filter captures luminance signals while effectively blocking high- and low-pressure sodium (Na)- and mercury (Hg)-vapor lamp lines, resulting in significantly less background noise. This substitution has been highly praised by customers worldwide, who report the advantages of the Astronomik CLS CCD filter for the luminance channel, making color deep-sky photography feasible in many regions.Suitability of the Astronomik Deep-Sky RGB filtersCMOS and CCD photography: Excellent for deep-sky imagingWebcam and video: Reasonable, used as a color filter for imaging planetsTechnical dataMaximum transmission typically 95% or betterAll Astronomik Deep-Sky RGB filters have IR- and UV-blocking Glass thickness: 1mm (except Astronomik OWB Type 3 and XT filters)Finely polished optical glass, free of any striae, residual stresses, and bubblesExtremely scratch-resistant and durable coatingCompletely resistant against high humidity and aging effectsAstronomik MFR coating (Astronomik Deep-Sky RGB, UV-IR Block L-1, L-2, L-3, and Narrowband-Emissionline filters)Parfocal with other Astronomik filtersDiffraction-limitedOptimized spectral windowsDelivered in a high-quality, long-lasting filter boxDue 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. All 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.Every 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.