Astronomik narrowband SII filters are an excellent choice for astrophotographers seeking to capture the highest-contrast, most detailed deep-sky images. These filters significantly reduce the effects of light pollution, allowing you to take spectacular images even under bright urban skies. Astronomik photographic filters can be used not only with conventional CCD cameras, but also with digital DSLR cameras as well as video and webcam cameras.
The filters offer excellent transmission within the selected wavelength range—in this case, the SII band—while completely blocking light at all other unwanted wavelengths. This increases the contrast between the sky background and the observed object, making even faint details recordable. Unlike visual filters, they also block the IR range.
Halo-free imaging and premium solutions
When a narrowband filter is placed in the optical path, distracting halos often appear around brighter stars. This undesirable effect affects filters from almost every manufacturer and naturally reduces the aesthetic quality of images. Fortunately, Astronomik's specialists have succeeded in eliminating this optical flaw. Through meticulous refinements to the coatings, they have ensured that images taken with Astronomik filters are halo-free!
An important advantage is that Astronomik photographic filters are parfocal with one another, meaning there is no need to refocus the camera every time you change filters.
All Astronomik deep-sky filters are manufactured with the utmost care and precision, ensuring the best possible contrast and transmission. The exceptionally precisely polished glass substrate and filter coatings deposited in approximately 130 layers clearly place Astronomik filters above their competitors. Another key benefit is their exceptional scratch resistance, allowing them to retain their transmission characteristics even after many years of intensive use. Thanks to premium-quality materials and workmanship, Astronomik filters do not degrade image quality in the slightest. Unlike cheaper filters, stars remain perfectly pinpoint.