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.
