Skip to content
Due to the USA–China tariff escalation, we will temporarily not receive additional inventory for Celestron and Sky-Watcher products. As a result, we are unable to accept orders for any out-of-stock items and encourage you to take advantage of the products currently in stock while supplies last.
Due to the USA–China tariff escalation, we will temporarily not receive additional inventory for Celestron and Sky-Watcher products. As a result, we are unable to accept orders for any out-of-stock items and encourage you to take advantage of the products currently in stock while supplies last.
Baader 3.5nm / 4nm Narrowband Filter Set - CMOS-Optimized H-alpha/O-III/S-II

Baader 3.5nm / 4nm Narrowband Filter Set - CMOS-Optimized H-alpha/O-III/S-II

by Baader Planetarium
SKU BAA-2961670
$0
$829.00 USD - $1,769.00 USD
$829.00
$829.00 USD - $1,769.00 USD
$829.00 USD
Availability:
Backordered
Contact us to know when we will receive our next ones!
Availability:
Backordered
Contact us to know when we will receive our next ones!
Availability:
Backordered
Contact us to know when we will receive our next ones!
Availability:
Backordered
Contact us to know when we will receive our next ones!
Availability:
Backordered
Contact us to know when we will receive our next ones!
Availability:
Backordered
Contact us to know when we will receive our next ones!
Availability:
Backordered
Contact us to know when we will receive our next ones!

Free International Shipping

More information

  • Baader H-alpha / O-III / S-II Ultra-Narrowband (Narrowband) filter set - Premium Grade
  • 3.5 / 4 nm half width (to harmonize the exposure time of H-alpha with O-III / S-II), recommended for optical systems from f / 10 to f / 3.5
  • Enables the highest contrast even with the strongest light pollution, minimizes the size of the stars, makes the finest nebula details accessible - indispensable under Bortle 9/8/7 / (6) sky
  • Reflex-Blocker ™ hard-coated and optically polished - with sealed coating edges ( Life-Coat ™ )
  • Blackened edges all around, with a filter front indicator in the form of a black outer edge on the front
  • Optimized for modern CMOS cameras, but ideally suited for CCD camera technologies

The new generation of Baader CMOS-optimized filters features:

  • CMOS-Optimized Baader Filter
  • Increased contrast
  • Ever more narrow passbands
  • Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
  • FWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and s/n ratio
  • 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 black frontside 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

You may also like

  • $285.00 USD - $617.00 USD
    $285.00 USD - $617.00 USD
    $285.00 USD - $617.00 USD
    $285.00 USD

    Baader 4nm Ultra-Narrowband OIII Filter - CMOS-Optimized

    Options available

    Baader H-alpha / O-III / S-II Ultra-Narrowband (Narrowband) filter set - Premium Grade 3.5 / 4 nm half width (to harmonize the exposure time of H-...

    View full details
    $285.00 USD - $617.00 USD
    $285.00 USD - $617.00 USD
    $285.00 USD - $617.00 USD
    $285.00 USD
  • $235.92 USD - $235.92 USD
    $235.92 USD
    $235.92 USD - $235.92 USD
    $235.92 USD

    Baader 4nm 1.25" Ultra-Narrowband OIII Filter - CMOS-Optimized (USED)

    BAA-2961400-125-USED
    Only 1 left!

    In perfect condition, used Baader H-alpha / O-III / S-II Ultra-Narrowband (Narrowband) filter set - Premium Grade 3.5 / 4 nm half width (to harmo...

    View full details
    $235.92 USD - $235.92 USD
    $235.92 USD
    $235.92 USD - $235.92 USD
    $235.92 USD
  • $457.00 USD - $1,149.00 USD
    $457.00 USD - $1,149.00 USD
    $457.00 USD - $1,149.00 USD
    $457.00 USD

    Baader 6.5nm Narrowband Filter Set - CMOS-Optimized H-alpha/O-III/S-II

    Options available

    Baader H-alpha / O-III / S-II Narrowband Filter Set - Precision Grade 6.5 nm FWHM, recommended for optical systems from f / 10 to f / 3.5 Reflex-...

    View full details
    $457.00 USD - $1,149.00 USD
    $457.00 USD - $1,149.00 USD
    $457.00 USD - $1,149.00 USD
    $457.00 USD
  • $167.00 USD - $429.00 USD
    $167.00 USD - $429.00 USD
    $167.00 USD - $429.00 USD
    $167.00 USD

    Baader 6.5nm H-alpha Filter - CMOS-Optimized

    Options available

    Baader H-alpha / O-III / S-II Narrowband Filter Set - Precision Grade 6.5 nm FWHM, recommended for optical systems from f / 10 to f / 3.5 Reflex-...

    View full details
    $167.00 USD - $429.00 USD
    $167.00 USD - $429.00 USD
    $167.00 USD - $429.00 USD
    $167.00 USD
  • $178.92 USD - $178.92 USD
    $178.92 USD
    $178.92 USD - $178.92 USD
    $178.92 USD

    Baader 6.5nm 36mm H-alpha Filter - CMOS-Optimized (OPEN BOX)

    BAA-2961100-36-OPENBOX
    Only 1 left!

    In perfect condition, open box Baader H-alpha / O-III / S-II Narrowband Filter Set - Precision Grade 6.5 nm FWHM, recommended for optical systems...

    View full details
    $178.92 USD - $178.92 USD
    $178.92 USD
    $178.92 USD - $178.92 USD
    $178.92 USD