Baader Methane-Filter 1¼" (889nm, 8nm)

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Baader Methane-Filter 1¼" (889nm, 8nm)

# 2458295

€ 225.00 Price excl. German VAT tax (19%): € 189.08

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  • Schott RG 830 substrate with super stack dielectric coating
  • for pure methane band transmission
  • non-ageing sealed coating edges

Product Questions

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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"?
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Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)
What are the threads and pitch of your 1.25" and 2" filters?
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Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)
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Specifications

Additional Information

Manufacturer Baader Planetarium
SKU (#) 2458295
EAN Code 4047825023285
Weight (kg) 0.06
Transmission Range Methan
Filter Thickness (without cell) 2 mm
HBW (Halfbandwidth) 8nm
CWL (Central Wavelength) 889 nm
AR-Coating dielectrically coated, planeoptically polished
Filter size 1 25 inch
Filter Usage CCD, Planetary, Specialty
Filter mounted Mounted (LPFC 6mm)
Type of Filter Narrowband
Single or Set? Single Filter
Filter shape round
FAQ
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Thomas Klemmer 98/04/2017 09/04/201702:13
  • Rating:
Recommend:
Definitiv
Planetenaufnahmen mit dem Baader Methanbandfilte
FAZIT: Die Planetenfotografie wird mit Hilfe von Methanbandfiltern um ein sehr spannendes Spektrum erweitert und eröffnet eine Vielzahl von neuen Möglichkeiten zur Bildgewinnung. Die geringe Signalmenge kann durch die hohe Transmission und den engen Bandpass des Baader Methanfilters gut kompensiert werden, wodurch die Aufnahme mit handelsüblichen Planetenkameras erst sinnvoll wird. Er bietet Hobbyastronomen, die über die klassische RGB Planetenfotografie hinausgehen möchten, eine spannende Alternative...
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Den gesamten, ausführlichen Testbericht finden Sie unter dem Tab "Downloads" bzw. hier: http://www.baader-planetarium.com/de/downloads/dl/file/id/472/product/1372/planetenaufnahmen_mit_dem_baader_methanbandfilter.pdf
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Andreas Murner 69/03/2016 10/03/201620:23
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Methane-filter - which one is best?
Dear Team Baader-Planetarium,

since I am using your 8nm Methanband Filter (#2458295), I am really looking forward to the new Jupiter season 2017. It gives a different and special view of the giant planet, and I really really like it!

Ok, the image is not that bright, since most cameras are not very sensitive at this wavelength, but when using apertures bigger than 150-200mm one can get stunning views of Jupiter and the other gas giants.

Someone may ask: what is this Methanband filter good for and why is it that narrow?
Images done in Methane-band are looking quite similar to images taken in the infrared part of the spectrum. They are showing deeper and warmer details. Storms like the Great Red Spot shine brightly, while the normal clouds are much darker. The latest impacts into Jupiters atmosphere where also well detectable. The moons appear very bright too, since they reflect the sunlight almost completely. Jupiters normal atmosphere leaks within the Methanband (at 889nm), and reflects almost no sunlight, but allows thermal radiation of lower atmosphere layers to clearly shine through.

The effect is similar on Saturn. The planet itself becomes obviously darker, while the rings remain relativly bright. Also a good opportunity to hunt for faint moons of the giant planets.

There are some other Methanband filters on the market in the meantime, but none of them is as narrow as this Baader-Filter. The problem of broader Methanband filters, e.g. 20nm or 50nm, is the huge amount of obfuscating red light within the desired bandpass. At it's best, a broad Methane filter will only provide a high contrast IR-pass image, but the real Methane-effect will be washed out. All those wider methane-filter-results will show slightly emphasized storms, but again - this can be done with any IR-pass filter just the same.

So, in my eyes, the Baader 8 nm Methane-filter with it's very narrow HBW is absolutley on top. Best in detail and contrast.

www.strehlbuster.com
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