Astronomik 6 nm H-alpha MaxFR Filter, 2"

Astronomik MaxFR H-Alpha Line Filter, 6 nm FWHM

There is an ever growing demand for filters suitable for extremly fast optical systems like Celestron´s RASA or the Epsilon Astrographs made by Takahashi.

The MaxFR emission line filters are suitable up to very fast focal ratios. The Astronomik MaxFR series of narrowband-emissionline filters is perfect matched to the requirements of astronomical deep-sky imaging with fast optical systems. For the three most important emission lines of oxygen (OIII), hydrogen (H-alpha) and sulfur (SII) you may select your filters either with 12 nm or 6 nm bandwidth (FWHM).

Highest transmission:

Astronmik´s MaxFR filters are made in a way, designed to work perfectly with fast optical systems. The built-in well known MFR coating technique gives you the best out-of-band blocking possible across the entire range of wavelengths from the UV up to IR! Your advantage of the design is a extremly high contrast, minimized stray light, no halos and needle-sharp stars. The Astronomik MFR narrowband emissionline filters give you the best quality of data: The best start material to be processed to a awesome final image!

For 12 nm MaxFR filters this means a unlimited usability from f/1.7 to f/8 and about 85% of the maximum transmission at a f/1.4 as guaranteed.

For 6 nm MaxFR filters this means a unlimited usability from f/2.2 to f/8 with about 90% of the maximum transmission at a f/2 as guaranteed performance data.

For maximum contrast the SII filter is carefully designed to block all light coming from H-alpha and NII (nitrogen).

Imaging with narrowband emissionline filters:

If you have to observe from light polluted sites (like most of us...), imaging with narrowband emissionline filters is the best way to take great images, as all kind of light pollution can be blocked very effective!

Normaly an H-alpha filter should be your first step into this amazing field of astrophotography! With an Narrowband H-alpha filter you will be able to take deep and contrasty images even wih very heavy light pollution or with the full moon high up in the sky! If you look at other astrophotos, an H-alpha is the best choice for all nebulas glowing red!

An OIII filters expands your imaging possibilities, as you are able to image all greenish/blueish structures. Planetary nebulas and star forming regions are great objects!

The SII filters completes your HSO-set of filters. With these three filters you are able to process your images like the ones from the Hubble space telescope!

The choice of the bandwidth depends on the camera and light pollution:

12 nm filters are the right choice for all DSLRs and dark-current limited cameras.

6 nm filters are the best choice for observing sites with extrem strong light pollution, cameras with low dark-current and when weak objects require the maximum contrast and star-reduction possible!

[{Quality aspects of the Astronomik MFR narrowband emissionline filters