Baader UBVRI Bessel U-Filter – photometric

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Baader UBVRI Bessel U-Filter – photometric

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€ 158.00 Price excl. German VAT tax (19%): € 132.77

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  • Baader UBVRI-U Bandpass Filter, suitable from f/15 to f/1.8
  • Classic photometric filter with transmission according to Bessel – parfocal with all Baader filters of the same size
  • Manufactured with most advanced ion beam coating technology / Daylight-Proof
  • Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)
  • Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim
  • Equally suitable for modern CMOS cameras as well as for older CCD camera technologies

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€ 158.00 Price excl. German VAT tax (19%): € 132.77

Product Questions and Answers

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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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100x100: I need to mount a much larger UV-or IR-filter onto my DSLR-lens than your regular astro 2" filters allow
Question by: FAQ - Team Baader on Nov 25, 2022 8:54:00 AM | 1 Answer(s)

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This new generation of Baader Filters features:

CMOS-optimierte Baader Filter
  • 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
  • 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

Further information, test reviews, image results...

... can be found on our detailed Blogposts:

Baader Blogpost:
DART impact - NASA used large 100mm Baader Bessel filters

Baader Blogpost:
Now available: New Baader UBVRI and SLOAN/SDSS (ugriz') Photometric Filters

Baader Blogpost:
New CMOS-optimized Baader Filters

Baader Blogpost:
Results of the tests made by Galli Gianni about the new Baader UBVRI Bessel filters

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Robert Reitsam 148/05/2023 29/05/202318:19
  • Rating:
Venus 28.05.2023 Baader U
Nach längerer Überlegung hab ich mich für meine Venusaufnahmen für den Baader U Bessel entschieden. Der Baader U Bessel hat den Schwerpunkt der Durchlässigkeit bei 370nm. Der Baader Venus Filter liegt bei 350nm. Bei 350nm ist meine aktuelle Kamera nicht lichtempfindlich genug. Die Luftunruhe wird zudem in Richtung kürzerer Wellenlängen überproportional schlechter. Ideal für Venus wäre wohl zwischen 360 und 380nm. Zwei Tage nach der Bestellung war der Filter da, obwohl ich in Österreich wohne.

Dank niedriger Filterhöhe ident zu den RBG-Filtern paßt der Filter problemlos in mein Filterrad. Gleich beim zweiten Einsatz ist die gezeigte Aufnahme entstanden. Sie besteht aus 72.000 UV-Einzelbildern und zeigt schönes UV-Wolken-Detail (anbei in Monochrom und Falschfarben). Die Belichtungszeit der Einzelbilder lag bei 10ms, was eine gute Durchlässigkeit im UV zeigt. Im IR ist der aktuelle Baader U Bessel komplett dicht und läßt keinerlei Licht durch. Ich bin mit meiner Entscheidung sehr zufrieden.
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Frank Weitzmann 123/05/2023 04/05/202314:06
  • Rating:
Baader U Bessel
Ich bin sehr zufrieden mit diesem Filter. Beste Qualität und eine schnelle Lieferung. Ich habe bisher den Planeten Venus mit einem einfachen violett Filter für UV Aufnahmen verwendet.
Der Baader U Bessel ist deutlich besser und bietet einen höheren Kontrast!
  • Sehr gute Bildauflösung der Venus im UV Licht.
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