Shopping cart
is empty

Home > Filters > Nebulae filters > H-Beta Filters > Astronomik > H-beta CCD > Astronomik H-Beta CCD EOS clip-filter

This product is no longer stocked and therefore cannot be purchased until further notice.

Astronomik H-Beta CCD EOS clip-filter

Product no.: 43807
Manufacturer: Astronomik

$ 176.00

incl. VAT
Astronomik H-Beta CCD EOS clip-filter
Product description
Specifications
Customer reviews
Recommended accessories

Product description:

One of the most important obstacles for the exploration of the night sky is the brightening of the night sky by artificial lights, such as streetlights. The night sky is not really dark in the vicinity of towns or cities, which reduces the visibility of objects beyond the Solar System enourmously.

Depending on the type of celestial object, it is possible to increase the contrast dramatically by blocking the annoying artifical light. This H-beta filter uses a characteristic property of the so called emmission nebulae. Those objekcts glow in special colors, the emmission lines. These emmission lines are linked to chemical elements - in this case hydrogen. A H-beta nebula filter blocks all other colors (and thereby nearly all of the artificial light) and only the emmission line of the hydrogen can pass the filter. The result is astonishing: Suddenly nebulae are visible at locations that were completely empty without a filter. In suburban skies for example the Horsehead Nebula is almost invisible with a 300mm telescope. By using this filter you can see the nebula and its structures without any problems. A must-have for every visual observer!

In contrast to purely visual filters, photographic CCD filters have built-in IR-blocking, which prevents the optical problems caused by infrared radiation.

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!

How do I interpret these transmission curves?

  • the wavelength is plotted in nanometers on the horizontal axis. 400nm corresponds to deep blue, 520nm to green and at 600nm to red
  • transmission, in %, is plotted on the vertical axis
  • visual filters: The gray curve shows the relative sensitivity of the dark adapted human eye at night
  • photographic filters: The gray curve shows the relative sensitivity of a typical CCD sensor
  • orange: the main emission lines which contribute to artificial sky glow, e.g lines from mercury (Hg) and sodium (Na)
  • green: the most important emission lines from nebulae, such as the lines from hydrogen (H-alpha and H-beta) and the lines from oxygen (OIII)

Recommended accessories:

 
accessory details
29.05.2020
We ship worldwide
Currency
Service
Advice
Contact
Universe2Go