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  • Astronomik filtro UHC 31,8mm Astronomik filtro UHC 31,8mm

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Astronomik SII 12nm CCD 50,8mm filter

Product code: AS8H00D6

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Quick Overview

The Astronomik SII 12nm CCD 50,8mm filter is suitable for imaging of SII regions from observation sites with light pollution and from dark sites as well. The contrast between an object glowing at 672nm and the background is increased enormous!


The 50,8mm model threads directly to 50,8mm nose that has m48 thread.

Availability: Available

Order €299.00
22% tax incl
if you pay by bank transfer €290.03

Details

Due to the combination of the narrow bandwidth of 12nm and the high transmission of typically 96% the filter gives you an contrast boost, as all unwanted light from other wavelengths than 672nm is blocked form UV up to the IR. This results in an very dark background compared with any filters with a higher bandwidth. The FWHM of 12nm is optimized for typical DSLR cameras with CMOS sensors and CCD cameras with a normal/high dark current: With these cameras the background signal in images taken from heavily light polluted sites is dominated by the dark current of the sensor, not by fluy coming from light pollution. In this case a further reduction of FWHM does not improve the image, as the background will not get darker. Compared to the 6nm filters you have more stars in the field of view which gives you more guiding stars when working with an integrated/dual guiding chip!

 

Main use

The filter blocks all unwanted light from artifical light-pollution, natural airglow and moonlight. Especially light from High- and Low-Pressure Sodium and mercury lights and all lines of natural airglow are 100% blocked. The filter increases the contrast between the sky-background and objects.


 

Suitability

Guaranteed Transmission of more than 90% at the SII Line (672)
Typical Transmission of 96% at the SII Line (672nm)
Full-Width-Half Maximum (FWHM): 12nm
perfect blocking of unwanted light from UV up to the IR
parfokal with all Astronomik filters
MFR Coating technique: Usable with all optics up to f/3
Thickness of 1mm
Not sensitive to moisture, scratch resistant, not aging
opticaly polished substrate, striae-free and free of residual stresses
High quality storage box

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