Manufacturer: Astronomik Filter
Product number: 8h00kf

EUR 179,00


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rating: 4.0 of 5
  • Details..
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Astronomik CLS-CCD Nebula Filter for Astrophotography
This filter is suitable for photographing nebulae, star clusters and also galaxies even from close to the city. The contrast of the deep-sky objects is enhanced, because the light of the artificial illumination is blocked as far as possible. This allows you to expose 3x longer before the sky background is brightened. The CLS CCD filter thus improves results whether you are working near cities or under dark skies far from settlements.

The CLS CCD filter is ideally suited for photographic use on telescopes of all apertures with focal ratios from f/15 to f/2.

How the CLS-CCD filter works:

The filter completely blocks the emission lines of low and high pressure lamps (mercury (Hg) and sodium (Na)) and the lines of airglow. This improves contrast everywhere, even under dark alpine skies.

All important emission lines of astronomical objects are transmitted. The filter also blocks infrared light (IR light). An additional IR blocking filter is therefore not necessary.

Astronomik CLS CCD XT Clip Filter for Canon EOS APS-C cameras
The clip filter is optimized for use with normal camera lenses and for telescope use.

The filters sit securely and tension-free in the camera. Assembly and disassembly are easy with your finger, without tools! No changes to the camera are required to use the filters!

The challenge:

Do you own a Canon EOS digital camera for astro-imaging? Then you have surely encountered the following problems:
Large filters for large camera lens objectives are very expensive.
If you place a filter holder between your camera body and lens, you loose the ability to focus to infinity.
For very fast (low f/ number) telescopes like the Vixen R200SS or the Takahashi “Epsilon” astrograph, a filter drawer or a filter wheel cannot be used since the distance to the corrector lenses would be changed.
With long exposure times, your camera’s sensor chip is exposed to more dust.


With the Astronomik Clip-Filter system you can take care of all of these problems at once!

The patented Astronomik Clip-Filters are made of black anodized aluminum and laser-cut on state-of-the-art machines. They can be inserted within seconds directly into the EOS camera body. There are no changes necessary and all lens functions (focus, screen, image stabilization) remain operational!

Almost all Canon EF system lenses (but not EF-S, EF-M or RF) and all M42 and T2 lens adapters, can be used with the Astronomik Clip-Filter system. The Clip-Filter system also acts as an outstanding dust shield, which prevents the possibility of dust settling on the sensor during long time exposure (The MC-Clear filter does not have a filter effect and only acts as a dust shield.)

Compatibility:

Not suitable are cameras offered before 2003 and all varieties of the Canon EOS 1D and EOS M.

Astronomik XT filters
The new Astronomik XT filters are designed to give you widefield images with beautiful crisp and sharp stars right to the edge of the field.

The Astronomik clip filters are a popular and very well known tool among astrophotographers in the whole world. Sadly image quality was limited when using them with very short focal lengths to take widefield images: even if the normal Astronomik filters are made of 1 mm thick glas only, some wide angle lenses showed aberations in the edge of the field of view when used with Clip-filters.

The new Astronomik XT filters are coated on an ultra-thin substrate with a thickness of 0.3 mm only! Due to that the residual aberations are minimized and stars are crisp and sharp right into the corner of the image

The second image shows the corner of a comparision image, taken with a Canon 700D and a Sigma 10-20 mm F4,0-5,6 EX DC Wide-angle lens at 10mm. Compare star sizes/figures:

The upper half was taken with a conventional 1 mm Astronomik CLS filter.
The lower half was taken with 0.3 mm Astronomik XT CLS filter.

This extremely thin substrate is polished to the highest standards, free of internal strain and stress and suitable even for the most advanced imaging applications.

The XT filters are produced in the same way as the normal Astronomik filters: 100% scratch resistant, not sensitive to moisture or high humidity and no-ageing. Due to this the XT filters will have the same performance today and in many years in the future. To emphazise this you get a 10 year warranty on Astronomik filters!

Please note: Not all Astronomik filters are available as XT filters: due to the huge amount of work to produce these ultra-thin filters, Astronomik is currently doing only a selection of filters, which are mostly used for wide-field imaging. If you require an XT filter not listed below, please drop us a line.
Connection:Clip filter for EOS cameras with APS-C sensor
Thickness of the filter glass:0.3 mm
Material of the filter cell:Aluminum
Transmission at 486 nm (H-beta):95%
Transmission at 496 nm ([O III]):95%
transmission at 501 nm ([O III]):95%
Transmission at 656 nm (H-alpha):97%
1st transmission range:450 nm to 520 nm
2nd transmission range:640 nm to 690 nm
Substrate:Fine optical polished substrate material
Parfocal:with all other Astronomik XT filters
Anti-reflective coating:Not sensitive to moisture, not aging, scratch resistant
1 filter in robust plastic box



Reviews

Written by Carl Björk
on 2018-06-13

"If measurement of SNR doesn´t show much improvement. In a light polluted sky (5 on Bortle scale), it allows a much longer exposure (up to 4 times). Integrated or individual subs do not show reddish tint thus background post treatment is much easier. A must have under light pollution. "