Astronomik XT filters for wide-angle lenses: The new Astronomik XT filters have been specially developed for astrophotography with wide-angle lenses and deliver sharp star images right into the corners of the image.
Astronomik clip-on filters have been a popular and well-known accessory for astrophotographers around the world for many years. However, when using lenses with very short focal lengths for wide-angle photography, standard clip-on filters can cause aberrations, and the stars in the outermost corners of the image become streaked. To solve this problem, the new Astronomik XT filters are mounted on an extremely thin substrate with a thickness of only 0.3 mm or 0.5 mm, which significantly reduces these aberrations.
Despite their reduced thickness, Astronomik XT filters offer the highest optical quality: they are finely polished, free of streaks, internal stresses and bubbles, and suitable for the most demanding applications.
Astronomik XT filters are manufactured using the same durable coating technology as all Astronomik filters. They are extremely scratch-resistant, insensitive to high humidity and non-ageing. This ensures that they maintain their performance for years to come.
Please note that not all Astronomik filters are available as XT versions, as the manufacture of these extremely thin filters is very complex. Currently, filters are being produced that are ideal for photography with wide-angle lenses.
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 conditions 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!
