The Astronomik Narrowband OIII Filters are the first choice for all astrophotographers who want to get the most contrasty and detailed deep-sky images possible. The filters significantly reduce the effect of light pollution, so you can take spectacular images even in bright urban skies. The Astronomik photographic filters can be used not only with conventional CCD cameras, but of course also with digital reflex cameras or even video and webcams.
The filters have excellent light transmission in the selected wavelength range (in this case the OIII range), while at other "unwanted" wavelengths they "cut" the light completely. As a result, the contrast between the sky background and the observed object is increased, allowing faint details to be captured. Unlike visual filters, they "cut off" the IR range.
Halo-free imaging and premium solutions
It is often the case that placing a narrow-band filter in the light path results in a distracting halo around brighter stars. This undesirable phenomenon is true of filters from almost all manufacturers, and of course reduces the aesthetic value of our images. Fortunately, the experts at Astronomik have managed to eliminate this optical defect. By making subtle changes to the coatings, they have achieved halo free photos with Astronomik filters!
A not insignificant aspect is that Astronomik photographic filters are parfocal to each other, meaning that you don't have to sharpen your camera every time you change filters.
All Astronomik low-light filters are made with the utmost care and precision by the manufacturer, so contrast and light transmission are the best possible. The extremely precise polishing of the glass material and the filter coating, which is vapour-deposited in about 130 layers, clearly set Astronomik filters above their competitors. Another advantage is their extraordinary scratch resistance, which is why they retain their transmission characteristics even after many years of intensive use. Thanks to their premium quality materials and machining, Astronomik filters have minimal degradation of imaging. Unlike cheaper filters, stars remain completely point-like.
EOS-clip version
The EOS-clip version of the filter is designed specifically for owners of EOS SLRs. Thanks to its unique solution, the filter can be clipped simply by hand into Canon EOS cameras without any tools or accessories. This makes it possible to take astrophotographs not only through binoculars, but also with telephoto lenses that can be attached to the camera. The clip-on filter can be used with almost all lenses on the market, except Canon lenses with the EF-S mark.