Astronomik Filters

• ASTRONOMIK

The Astronomik UHC filter is highly recommended for visual deep-sky observation. It lets through almost 100% of the radiation from both O-III lines and the H-beta line. A second bandpass for the H-alpha line ensures that this radiation also reaches the eye. Background scattered light from other wavelength ranges is filtered out.

Due to the the strong reduction of sky background, gas nebulae and planetary nebulae are visible with unprecedented detail. The filters are optimised for use with focal ratio from f/4 to f/15. The loss of transmission and colour distortion usually found with other filters is only evident in Astronomik filters at extremely fast focal ratios of 1/3 and faster.

Size: 1.25"

• ASTRONOMIK

The Astronomik OIII filter is designed for visual observation of gas nebulae and planetary nebulae. Due to the extremely small band pass of the two OIII lines, the filter will produce a significant increase in contrast even under best observing conditions. For faint supernova remnants and faint planetary nebulae the Astronomik OIII filter often makes the difference that determines whether the object can be seen or not.

The best focal ratio for this filter is f/4.5 to f/6 but they are useful from f/3.75 up to f/15. Loss of transmission and colour distortion common in other filters only becomes evident with Astronomik filters at extreme focal ratios of f/3 and faster. So you can see extended objects in the whole field of view and not just in the middle.

Size: 1.25"

• ASTRONOMIK

The Astronomik H-Beta filter is designed for visual observation of gas nebulae with larger scopes. Due to the extreme small band pass of the H-Beta line, the filter will produce a maximum increase of contrast even under best observing conditions. It is especially good for faint H-II nebulae like the horsehead nebula. With the Astronomik H-Beta you will be able to see the horsehead nebula with scopes of 10" to 12" aperture under good skies.

The best focal ratio for the use of this filter is f/4.5 to f/6 but it is useful from f/3.75 up to f/15. You can see extended objects in the whole field of view and not only in the middle.

Size: 1.25"

• ASTRONOMIK

The Astronomik CLS is an inexpensive sollution for visual deep-sky observation, b&w photography and CCD observation. It is the right filter to improve the contrast of nearly all objects under light-polluted skies with all sizes of telescopes.

Due to the design of the transmission curve the filter reduces the sky background. Gas nebulae, planetary nebulae as well as open clusters, globular clusters and galaxies are all seen better. The Astronomik CLS blocks the emission of Hg and Na streetlights as well as all Skyglow-lines .

The filters are optimised for the use with focal ratios from f/4 ito f/15. Loss of transmission and colour distortion common with other filters are only evident with Astronomik filters at extreme focal ratios of f/2 and faster.

Size: 1.25"

• ASTRONOMIK

CCD cameras are very sensitive to near infra-red light which is not well-focused by most optical systems. This usually shows up as a glare around the optical images which needs to be removed. The IR-blocker does this very effectively.

The Astronomik IR cut-off filter can be used at all focal ratios. It will produce its full performance equally well with an f/1.2 photo lens and an f/20 refractor. Because the glass substrate has a very high optical quality, use it in front of the lens without any loss of image quality. Due to the extreme robust coating the filter can be used to protect sensitive optics.

Size: 1.25"

• ASTRONOMIK

The Astronomik H-Alpha CCD filter is designed for CCD imaging of gas and planetary nebulae. Due to the narrow bandpass of the H-Alpha line at 656 nm, the filter provides maximum increase in contrast even under poor observing conditions. The 13 nm bandwidth allows us to achieve transmission as high as 97% - a value that is impossible to reach with filters of narrower bandwidth.

With faint supernova remnants and planetary nebulae, the Astronomik H-Alpha filter often makes the difference between detecting the object or not. The filter blocks all unwanted light, especially the Mercury (Hg) and Sodium (Na) emissions from streetlights and the IR region where CCDs are often most sensitive.

Size: 1.25"

• ASTRONOMIK

The Astronomik OIII-CCD filter is designed for CCD imaging of gas and planetary nebulae. Due to the narrow bandpass of the OIII line at 501 nm, the filter provides maximum increase in contrast even under poor observing conditions. The 13 nm bandwidth allows it to achieve transmissions as high as 97% - a value that is impossible to reach with filters of narrower bandwidth. The filter blocks all unwanted light, especially the Mercury (Hg) and Sodium (Na) emissions from streetlights and the IR region where CCDs are often most sensitive.

Size: 1.25"

• ASTRONOMIK

The Astronomik SII-CCD filter is designed for CCD imaging of gas and planetary nebulae. Due to the narrow bandpass of the SII line, the filter provides maximum increase in contrast even under poor observing conditions. The 13 nm bandwidth allows it to achieve transmission as high as 97% - a value that is impossible to reach with filters of narrower bandwidth.

The filter blocks all unwanted light, especially the Mercury (Hg) and Sodium (Na) emissions from streetlights and the IR region where CCDs are often most sensitive.

Size: 1.25"

• ASTRONOMIK

The transmission curves of the Astronomik RGB filters are optimised for CCD- astronomy. With this filter-set we finally make true colour pictures of all objects possible. Continuum emitters like stars and galaxies as well as objects that shine only in single lines (e.g. planetary nebulae), are reproduced in their true colours. Because of the design of the band pass of the filters, the colour sensitivity of the human eye is optimally reproduced. You get CCD pictures that show the object just as you would see it if your eye were sensitive enough.

Size: 1.25"