Menu
Cart 0

Astronomik

H-alpha CCD Filters (6nm)


  • 19995

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


Description

This H-alpha Filter is suitable for imaging of Hydrogen nebulas from observation sites with light pollution and from dark sites as well. The contrast between an object glowing at 656nm and the background is increased enormous!

Due to the combination of the narrow bandwidth of 6nm and the high transmission of typically 96% the filter gives you an enormous contrast boost, as all unwanted light from other wavelengths than 656nm is blocked form UV up to the IR. This results in an extremly dark background.
The FWHM of 6nm is matched to give you optimal performance with CCD and CMOS sensors with a very low dark current! The 6nm filter is the best choice if you are observing from a heavily light polluted site or if you are imaging faint objects in starcrowded regions of the milkyway.

Due to the new MFR coating technique you may use one single filter on all instruments up to f/4 without a significant reduction in performance.

Der Astronomik H-alpha filter MUST NOT BE USED for solar observation!

Astronomik CCDSeries Filters offer the world's largest family of products for color, contrast, and line filters for astronomy. Our Quality Statement is quite simple: we make the best filters for astronomy!

With Astronomik CCD Photographic Filters you get highquality filters for each type of out-of-this-world photographic image you are shooting. When we say "photographic'' we think of each type of imaging sensor. Cooled CCD cameras, digital and analog video cameras, Webcams, digital SLRs (DSLRs), and also conventional chemical film are all in our vocabulary. Our Astronomik Photographic Filters are the photographic filters of choice by professionals and leading amateurs worldwide on all sizes of instruments.

Our selection of filters is broad enough to offer you the most suitable filter for almost every instrument and every imaging mission. Whether you are using a small instrument or enormous professional optics, whether you are imaging under the light polluted skies of a large metropolitan area or from atop high mountains, Astronomik has the filter which will provide you with the best results. Period.

Our Photographic filters are optimized for photographic applications so that each object can be recorded with maximum image quality. Our LRGB color filters can reproduce the correct color of emission line nebulae, as well as the correct color of objects with a continuous spectrum objects such as stars, star clusters, galaxies, reflection nebula. (Other manufacturers sell LRGB filter sets which suppress artificial sky illumination and expect you to accept a significant loss in color balance.)

The transmission curves of our emission-line filters are designed for maximum suppression of atmospheric light pollution and sky background which results in maximum contrast gain. In addition, when using the contrast filter CLS CCD the sky background (due to light pollution) will be suppressed and the colors of the object and the stars will be kept accurate. The curves of the transmission filters are optimized for contrast enhancement and color for instruments with an aperture ratio of f/3.8 to f/15. The use of even faster systems is possible, however we recommend a short consultation for some special instructions.

All Astronomik CCD filters are parfocal, no refocusing is necessary after changing filters. 

The new series of Astronomik MFR Narrowband-Emissionline Filters is perfect matched to the requirements of astronomical Deep-Sky imaging. For the three most important emission lines of Oxygen (OIII), Hydrogen (H-alpha) and Sulfur (SII) you may select your filters eitherwith 12nm or 6nm Bandwidth (FWHM).

Our new filters are made in a completely new construction, which makes the best Out-of-Band blocking possible across the whole range of wavelengths from the UV up to IR! Your advantage of our new design is a extremly high contrast, minimized stray light, no halos and needle-sharp stars. With the new Astronomik MFR Narrowband-Emissionline filters you get data with the best quality possible: The best starting material to be processed to a awesome final image!
To get the maximum from the valuable observation time you need filters with the highest transmission possible. We do guarantee a transmission of 90%, but typically the transmission is as high as 96% . -These values are valid for the 12nm and the 6nm filters as well!
For maximum contrast the SII filter is carefully designed to block all light coming from H-alpha and NII (nitrogen).

Due to the new MFR coating the new Astronomik Narrowband filters can be used at nearly all instruments and safe you money:
Contrary to filters from other manufacturers the transmission curve of the new Astronomik Narrowband-Emissionline filters is nearly not shifted when used with fast optical systems! While other manufactures sell special "High Speed" filters or you even have to buy a new filter for each scope, this is not the case with the new Astronomik Narrowband-Emissionline filters with MFR coating. Save lot´s of money as you may use all filters with 12nm Bandwith (FWHM) with any instrument up to f/3 and all 6nm filters up to f/4!

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 targets! 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 h-beta filter is not available in a 6nm version, as this filter has nearly no meaningfull application. To illustrate this, there are two images shown below: Both were taken with a unmodified Canon 650D. Even as the camera has a sensitivity of less than 10% at H-alpha, there is some signal und structure in the h-alpha image, while you cannot see anything on the image taken with an H-beta filter!

Specifications

Technical data of the filter:

  • Guaranteed Transmission of more than 90% at the H-alpha Line (656 nm)
  • Typical Transmission of 96% at the H-alpha Line (656 nm)
  • Full-Width-Half Maximum (FWHM): 6nm
  • 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/4
  • 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

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 targets! 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 h-beta filter is not available in a 6nm version, as this filter has nearly no meaningfull application. To illustrate this, there are two images shown below: Both were taken with a unmodified Canon 650D. Even as the camera has a sensitivity of less than 10% at H-alpha, there is some signal und structure in the h-alpha image, while you cannot see anything on the image taken with an H-beta filter!

Operation of the filter:
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 glowing at the xx line at xy nm.

Tipps and Hints for more applications:
Using the H-alpha-CCD filter together with OIII-CCD and SII-CCD filters you make produce false-color emission line images (HSO) in the same way as the Hubble-Space telescope. This is possible even from heavyly light polluted sites!

Alternatives:
The lower priced 12nm filters are the right choice for you, if you own a typical DSLR or a CCD camera with a high dark current! The 12nm filters should be the fist choice for cameras with an integrated guiding sensor, as you will have about twice as much stars compared to the 6nm filter.

Astronomik CCD Filter Quality Characteristics:

  • Superior Substrate: Astronomik filters consist of a precision polished substrate on which the actual filter, in the form of very thin dichroic layers, is applied. These high quality measures will in no way reduce the performance of your optical train. Contrary to common experience with other manufacturers’ filters, with Astronomik filters stars remain fine needle points of light! (read more...)
  • Coating: Astronomik filters consist of up to 130 layers deposited on top of the completely transparent carrier glass. These layers comprise both the actual filter and an antireflective coating. (more...)
  • Parafocal Filters: All Astronomik CCD Filters are parafocal. When changing filters, the focal point will not change; you will not have to refocus your camera. This is due to the high tolerance and very low thickness of the substrate and coating.(more...)
  • Durability: Astronomik filters are completely scratch resistant, and not sensitive to moisture, dew, or high humidity (touching a dewedup filter will, of course, not destroy it...if it is made by Astronomik!). With others´ filters, after a few years, you quickly notice their filters degrade and are not at their full, new capability. Not so with Astronomik filters which maintain their "brand new" transmission specifications. And, because of Astronomik´s extraordinarily resistant coating technology, our filters come with a 10year warranty. (more...)
  • Comparing Astronomik CCD Photographic Filters to our Visual Filters: Unlike Astronomik Visual Filters which do not require IR blocking, our Astronomik CCD Photographic Filters do include IR blocking filter layers to prevent any problems from Infrared Radiation (IR) when using CCD and chemical photographic devices.

Astronomik filters are highquality accessories for photographic imaging which will significantly expand your imaging opportunities while helping you create beautiful images. After many years of use your Astronomik filters will be an accessory which will be ready to give you the same joy you experienced many years earlier when they were new.

Now that's an investment worth making!

Quality aspects of the new Astronomik MFR Narrowband-Emissionline Filters:

  • MFR Coating: The 12nm Filters can be used on all instruments up to f/3, the 6nm filters up to f/4. (Filters for faster optics are available upon request.)
  • High-Quality substrate: Astronomik filters are made with stress- and striae free, opticaly polished glass. The filter itself is made of ultra thin layers on this substrate!
  • Parfocal filters: All Astronomik Filters are parfokal! Due to the very small thickness-tolerance the focal plane is not shifted when changing filters! We have supplied parfocal filters for optical system as fast as f/1!
  • Coating: Astronomik filters are made of up to 130 layers which are coated on both sides of the substrate. These layers form the filter itself and act as a Anti-Reflection Coating.
  • Durability: Due to our coating technique all Astronomik filters are highly scratch resistant, not sensitive to moisture and do not degrade when getting older. -Every Astronomik filter will deliver it´s full perfomance and meet the specs at the point of shipping even after lot´s of years.
  • Integated Blocking: All unwanted light is blocked in the whole spectral range from UV up to the IR! (You will not need an additonal UV & IR-Blocker when imaging with the new Narrowband-Emissionline Filters with MFR coating!)
  • Wide range of available sizes from 1,25" up to square 50mm x 50mm filters.
  • Delivered in a high-quality Protection & storage box.
  • Due to our outstandding Coating technique we do offer a 10 year guarantee on all of our filters. (Check some forums, we REALLY do so!)

You get the highest quality possible with every single Astronomik filter to be able to take perfect images with your instruments! Especialy the filters against Lighpollution and the Narrowband-Emissionline filters will expand your imaging possibilities enormous! You are investing your money for an accessory which will work in lot´s of years in the same ways it did when it was brand new. Due to our special coating technique the filters do not degraed when getting older, and due to the new MFR coating you will be able to use the filter on nearly all instruments!

 

Typicall questions asked by customers looking for Narrowband-Emissionline Filters:

  • Which Full-Width-Half-Maximum is the best one for me? 12nm or 6nm?

The question which Full-Width-Half-Maximum (FWHM) is the "best", shows up on in eMails on our monitor or when talking to customers at fairs very often. A general "right" or "wrong" or "best" does not make any sense. -We would not offer both series if they were not needed.
When imaging from the city/suburb the images taken with DSLRs and most CCD cameras are limited by the dark current of the sensor and not by the brightness of the sky backgrund. In this case you will not see fainter structures when using a 6nm filter instead of the 12nm version. Additional to that cameras with an integrated guiding sensor will get more stars for guiding with the 12nm filters!
If you have a camera with an extremly low dark current and effective cooling, the 6nm filters will give you major advantages: Due to the stronger blocking of the background you will be able to expose longer and get deeper images! All stars are very tiny points, most faint stars do not show up anymore! -This is a major advantage even for normal cameras, as you can take images of faint structures even in star-crowded regions of the milkyway!
To put it short: 12nm Filters are the right choice for all DSLRs and dark-current limited cameras.
6nm 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!

  • How much is exposure time increased?

This question is asked quite often, and the answer is very easy: You don have to expose longer, but you MAY expose longer!
Due to the high transmission of approximately 100% at the center wavelength nearly all these photons reach the sensor. So the number of fr example "H-alpha-photons" does not change significant wether a H-alpha filter is installed or not. But looking at the photons of other wavelength, which wi do NOT want to record makes the effect of the filter clear: The combination of a very good blocking of all unwanted light from UV up to the IR and the narrow bandwidth of the filters reduces all unwanted signal on the sensor! If you do an exposure of 30sec without any filters from a lightpolluted urban observing site, your sky-background might be allready very, very bright or even saturated. The same image taken with an Narrowband-Emissionline filter will give you a perfect black background without any signal and the signal from the object will be about the same. With this black background you have the possibility to expose longer -propably 30min instead- to record fainter structures! So itś not a "must", it´s a "may".

The table gives you a short Overview about the suitability of our filters for various applications:

 

Filter/Ability

Visual dark skies

Visual urban

Film

CCD

DSLR (Original)

DSLR (Modified)

DSLR (MC)

Webcam/ Video (Planets)

Webcam/ Video (Deep Sky)

OIII CCD – 12nm

++

++

-

++

++

++

++

--

0

Hβ CCD

++

--

-

++

++

++

++

--

--

Hα - 12nm

--

--

0

++

+

++

++

--

+

Hα - 6nm

--

--

--

++

+

++

++

--

--

OWB  CCD Type 2

--

--

--

--

--

++

++

--

--

CLS CCD

+

0

++

++

++

++

++

--

++

Pro-Planet IR 742

--

--

-

0

--

--

++

++

++

Pro-Planet IR 807

--

--

--

0

--

--

+

++

++

IR-Black

-

-

-

++

-

-

++

++

++

UV-IR-Block

-

-

-

++

-

-

++

++

++

LRGB Type 2C

+

+

--

++

--

--

--

+

+

MC Klarglass - 12nm0

0

0

0

+

0

0

0

0

0

SII CCD

--

--

-

++

--

++

++

--

--

 

Legend:

++        The filter is excellent for this application, the dramatic better image!

+          The filter is good for this application, the much better image!

0          The filter is suitable for this application, the slightly better image!

-           The filter is usable for this application.

--          The filter is not suitable for this application


Customer Experiences

Introducing...

 

Our Zero-Risk

Telescope Upgrade Path

For our customers who dream of expanding their horizons and gazing deeper into the night sky, we offer personalized telescope upgrade paths. Learn More> 


Shop For...