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Filters > Nebulae filters > H-Alpha Filters > Astronomik > H-alpha 12nm > Astronomik Filters H-alpha 12nm CCD Clip Canon EOS APS-C
Product no.: 16750

Filters H-alpha 12nm CCD Clip Canon EOS APS-C

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Product description

Astronomik H-alpha 12nm Filter

The Astronomik H-alpha filter is a narrow band filter for CCD photography. The filter lets the H-alpha light of emission nebulae pass and blocks nearly the whole remainder of the spectrum where the CCD is sensitive.

We have re-desgined all of our photographic filters. Since the end of 2008 we are shipping our new "Halo-Free" filters. read more...

The full width at half-maximum (FWHM) of 12nm is optimized for the use with common CCD cameras and allows the use of very fast optics. It should be noted that the filter has a transmission of up to 99%.

Another advantage of the 12nm filters is the availability of guiding stars for cameras with a built-in-autoguider (SBIG). If you use a very strong filter like our 6nm filter you often won’t find a usable guidestar.

The range of application extends from 1:2.8 to 1:15. Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when extremely bright aperture ratios of 1:2 and more come into play.

Main use

The Astronomik H-alpha-CCD (12nm version) increases the contrast between objects, in this case between the H-alpha emission line and the skyglow background. Our Astronomik H-alpha-CCD (12nm version) completely suppresses the emission lines of artificial lighting (mercury (Hg) and sodium (Na)) and skyglow.

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!

Specifications

Capacity


Coating of optical system
multiple
Mount material
Aluminium
Frame
Clip-Filters
Appropriate for...
Canon EOS
Central wavelength (nm)
656
Half-value width (nm)
12
filter thickness (mm)
1
Transmission
96

General


Series
H-alpha 12nm
Type
Filters
Type of build
line filter

Area of application


Visually useful
no
Useful for photographs
yes
Anti light-pollution
yes
Daylight and twilight observation
-
Mercury
-
Venus
-
Mars
-
Jupiter
-
Saturn
-
Uranus
-
Hydrogen nebulae
yes
Planetary nebulae
-
Supernova remains
-
Comets
-
Central stars
-
Twin stars
-
Galaxies and star clusters
-

Recommended accessories

Astrophotography (1)

Astronomik Adapter EOS-Clip / M48

$ 27.90*

*All prices include VAT plus shipping costs.

Astronomik Filters H-alpha 12nm CCD Clip Canon EOS APS-C
Light transmission curve
Astronomik Filters H-alpha 12nm CCD Clip Canon EOS APS-C
Example of use

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