Astronomik XT filters for wide-angle optics: With these filters, you can achieve beautiful star images right into the corners of the image, even with extreme wide-angle shots.
With other Astronomik filters, the image quality in the corners of the image is limited at short focal lengths (wide angle): Although the filters consist only of a one-millimetre-thick glass plate that carries the filter layers, this plate causes aberrations with certain types of short-focal-length lenses, and the stars are pulled apart into streaks.
Astronomik's XT filters are mounted on an extremely thin carrier substrate that is only 0.3 millimetres thick. This reduces "star streaks" in the corners of the image to a minimum.
The extremely thin carrier substrate of the XT filters is, of course, finely polished, stress-free and meets the highest demands of astrophotographers worldwide in every respect.
Despite this ultra-thin glass, Astronomik XT filters feature the same coating technology found in all Astronomik filters: completely scratch-resistant, moisture-resistant and non-ageing. The filter will retain 100% of its performance even after many years.
The ProPlanet IR 807 filter cuts off the visible part of the spectrum and only opens at a wavelength of 807 nanometres. This blocks the areas of light that are particularly sensitive to seeing and allows the areas of longer wavelength light that are significantly less sensitive to seeing to pass through. This significantly reduces seeing problems in planetary and lunar photography without significantly reducing the sensitivity of the imaging sensor.
Tips and instructions for use
- The ProPlanet IR 807 is intended as a supplement to the ProPlanet IR 742, for very poor seeing and telescopes with sufficient light-gathering power.
- The loss of sensitivity in most cameras with the '807' compared to the '742' is about one f-stop, corresponding to 50% or, conversely, a doubling of the exposure time.
- Darkening of the sky at dusk
- Images of bright planets, stars and comets in the daytime sky
- Images of young stars in dust clouds and star-forming regions
Alternative: With good seeing or telescopes with less than 10" (250 mm) aperture, it is worth using the Astronomik ProPlanet IR 742.
Please note: In principle, all camera lenses can be used with the Clip-Filter - i.e. Canon EF lenses or camera lenses from other third party manufacturers such as Sigma, Tamron, Tokina, Walimex etc. However, the use of clip-filters with Canon EF-S lenses is NOT possible!
