H-alpha Bandpass Filter (20 nm)

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H-alpha Bandpass Filter (20 nm)

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€ 94.00 Price excl. German VAT tax (19%): € 78.99

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  • H-alpha filter with 20 nm FWHM (CWL 656.3 nm), thus excellently suited for visual use at night - and photographically with CCD and CMOS cameras at telescopes with all f-ratios. Warning: this filter alone is not suitable for direct viewing of the sun!
  • With new, highly effective UV/IR block coating from 300 nm to 1400 nm
  • Similar to the Super G filter in O III, the 20 nm H-alpha filter is an outstanding high-contrast deep-sky H-alpha/red filter for RGB applications, optimised for all colour CCD and CMOS chips. It enables high-contrast images of H-II regions (e.g. North America nebulae) even from light-polluted environments.
  • Front-Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)

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€ 94.00 Price excl. German VAT tax (19%): € 78.99

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What's the actual size of your 2" filters in "mm" with and without frame/ring? What step down adapter is suggested from a 52 mm to "-- mm"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)

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What are the threads and pitch of your 1.25" and 2" filters?
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)

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Is it suitable for DSLR chips?
Question by: Álvaro Rivas on Apr 18, 2023 6:11:00 PM | 1 Answer(s)

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H-alpha Bandpass-Filter (20 nm)

This 20nm filter replaces the former 35nm H-alpha filter, which was developed for interline CCD cameras. Due to advances in sensor technology, now much narrower filters can be used with colour sensors.

Compared to the CMOS-optimized Baader (Ultra) Narrowband Filters, the 20 nm H-alpha filter passes considerably more light. This makes the stars in the image brighter, allowing easier focusing, and the filter can be used at all focal ratios: There is no need for preshifting as with narrow band filters. This filter is especially interesting for users of colour cameras (which are less sensitive to red than monochrome cameras) who do not need extreme narrowband filters and want to enrich their colour images with H-alpha. At the same time this filter is a valid alternative to a standard R-filter of the RGB-scheme. It blocks much more of deteriorating light pollution and still passes all H-alpha for all focal ratios.

A notable difference to all H-alpa pass filters on the market is the fact that this filter does include highly efficient UV/IR blocking. being completely blocked out to 1400 nm, to eliminate blurring ("heat-noise") caused by defocused light on refractor optics.

The Baader H-alpha Bandpass (20 nm) filter has got all the advantages of the new generation of CMOS-optimized Baader filters:

  • Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
  • Reflex-Blocker coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
  • Identical filter thickness to existing standards, with utmost care for parfocality
  • Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter, making additional front-masks obselete.
  • Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)
  • Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment

Baader Blogpost:
New CMOS-optimized Baader Filters

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A.BRINGMANN 183/07/2023 03/07/202309:39
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H-alpha Bandpass-Filter (20nm) - CMOS optimised - a new approach for urban RGB astrophotography
On the run from LED lamps and ever-increasing light pollution, I have tried to answer the following questions.
What happens if:
the new 20 nm H-alpha bandpass filter is used instead of a normal 100 nm R-filter and.
the new 9 nm O-III Super-G filter is used instead of the normal 100 nm G filter?

With the choice of the reflection nebula The Angel Nebula (NGC 2171) I have set the bar very high for the first test image. There are outstanding images of this object, e.g. from ChileScope, Lijiang Gemini Observatory or Namibia. At my location (Bortle scale 5), however, this faint nebula is a real challenge.

The result here is a "20 nm H-alpha / 9 nm Super-G / 100 nm B" image.
The new UHC-L / Ultra-L booster filter was used as luminance:

The Angel Nebula (NGC 2170) - a new approach to urban RGB astrophotography:

On the other hand, the new filters - 20 nm H-alpha bandpass filter and the 9 nm O-III Super-G filter - can be used as full line filters, as seen here:

Jellyfish Nebula (IC443 & IC 444) - testing new filters:

The EBV of this bicolour image was done according to the workflow of Marcel Drechsler:
Many thanks for your kind review! Since unfortunately it is not possible to render links in a product review, we have linked them again here below:
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A. Bringmann 51/02/2023 21/02/202309:39
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Von dem Nachfolger des Baader 35nm H-alpha Filter bin ich vollauf begeistert.
Diese Aufnahme ist am 07.FEB (Mondphase 97%) und am 09.FEB (Mondphase 88%) am Rande einer Großstadt entstanden. An dieser Stelle möchte ich zeigen, dass man mit diesem schönen Filter sogar unter recht ungünstigen Bedingungen und auch @ f/1.9 erfolgreich Deepsky-Astrofotografie betreiben kann.

Für diesen Test habe ich mich für scheinbare Standard Deepsky-Objekte entschieden.
Auf den zweiten Blick sieht man jedoch die Handicaps. Es ist ein zwei Panel Mosaik, das absolut gradientfrei und exakt zusammengesetzt ist. Man sieht auch das Orion Trapezium und der Dynamikumfang vom Zentrum des
Orion-Nebels bis hin in die äußeren Partien entspricht bei der EBV gefühlt der „Ewigkeit“.

In dieser Aufnahme steckt, würde ich sagen, recht viel Herzblut drin.

Bitte nehmen Sie sich einen Moment Zeit und beurteilen Sie bei voller Auflösung ( https://www.astrobin.com/full/rczzva/0/) die Sterne kritisch bis hin in die Ecken. Die Sterne sind hier nicht weiter prozessiert. In diesem Bild gibt es viele helle Sterne und es gibt nicht ansatzweise ein Halo.
Selbst am mag 1.9 hellen Alnitak ist alles perfekt. Etwaige Spikes kommen wohl vom Anschlusskabel der Kamera,
die sich beim C11-Hyperstar naturgemäß im Strahlengang befindet.

Auch über die Sternwarte und die 10micron GM3000 HPS sollte man an diese Stelle ein Wort verlieren.
Diese Aufnahme ist gänzlich ohne Guiding entstanden und die Belichtungszeit pro Sub betrug 600s.
Die Präzision von diesem Setup ist einfach sagenhaft!

Sagenhaft schön! Herr Andreas Bringmann war einer unserer ersten Tester des neuen Baader H-alpha Bandpass Filter (20 nm).

Wir bedanken uns für die Aufnahme mit den neuen Baader 2" H-alpha Bandpass Filter (20 nm) und freuen uns das dieser neue Filter sich derart bewährt.

Mehr Details zu der Aufnahme, aufgenommen mit dem H-alpha 20nm 2" Bandpass Filter, finden Sie auf der Astrobin Seite von Hr. Bringmann:

Flame, Horsehead and Orion Nebula - 2 panel mosaic - testing new H-alpha Filter

Volle Auflösung: Flame, Horsehead and Orion Nebula - 2 panel mosaic - testing new H-alpha Filter
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