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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Baader Planetarium RGB B-Filter 1.25" – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter 2" – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium FCCT Filter – RGB B-Filter 2" unmounted (Ø 47,4 mm)– CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter 31mm – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter 31mm – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter 31mm – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter 50x50mm – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter 65x65mm – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter – CMOS-optimized
Baader Planetarium RGB B-Filter 1.25" – CMOS-optimized
Baader Planetarium RGB B-Filter 2" – CMOS-optimized
Baader Planetarium FCCT Filter – RGB B-Filter 2" unmounted (Ø 47,4 mm)– CMOS-optimized
Baader Planetarium RGB B-Filter 31mm – CMOS-optimized
Baader Planetarium RGB B-Filter 31mm – CMOS-optimized
Baader Planetarium RGB B-Filter 31mm – CMOS-optimized
Baader Planetarium RGB B-Filter 50x50mm – CMOS-optimized
Baader Planetarium RGB B-Filter 65x65mm – CMOS-optimized

Baader Planetarium RGB B-Filter – CMOS-optimized

par Baader Planetarium
UGC BAA-2961600B
$123.00 - $360.00
$123.00
$123.00 - $360.00
$123.00
Égalisation de prix!
  • Available in 1.25" & 2" Mounted, Round Unmounted and Square Sizes
  • Blue (B) Channel for LRGB Imaging
  • Optimized for Modern CMOS Sensors
  • Designed for 1:1:1 Color Balance
  • High-Transmission, Anti-Reflection Coatings
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE aux USA pour les commandes de plus de 350$.
  • Description
  • FAQ
  • Specifications
  • In the Box
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  • Warranty

  • RGB B-Filter – CMOS-optimized

    This RGB B-Filter is engineered specifically for modern monochrome CMOS sensors and is available in mounted 1.25" and 2" cells, as 31mm, 36mm and 50.4mm unmounted round filters, as a 47.4mm unmounted filter for the Baader FCCT system, and as 50x50mm and 65x65mm squares. As a critical component of any LRGB imaging set, this Blue filter is designed to deliver clean, halo-free data and contribute to a simplified 1:1:1 color balance, addressing the unique challenges presented by today's high-sensitivity cameras.

    The Purpose of CMOS-Optimized Filter Design

    Modern CMOS sensors are significantly more sensitive and prone to reflections between the sensor and filter than their CCD predecessors. This CMOS-optimized filter addresses this directly with advanced anti-reflection coatings that effectively suppress halos around bright stars, resulting in cleaner raw data with higher contrast and darker backgrounds.

    The filter also features steep bandpass slopes. This design choice sharply rejects unwanted wavelengths from light pollution and atmospheric glow, ensuring that only the desired blue portion of the spectrum reaches the sensor for purer color data.

    Achieving 1:1:1 Color Balance with the RGB B-Filter

    A key goal of this CMOS-optimized filter set is to simplify color data acquisition. The transmission properties of this Blue filter are carefully balanced with its Red and Green counterparts to match the typical quantum efficiency curve of popular monochrome CMOS sensors. This allows you to achieve a natural color result with roughly equal exposure times (1:1:1) for each channel, saving valuable imaging time and streamlining your post-processing workflow.

    CMOS-Optimized Filters vs. Legacy CCD Designs

    While older filters designed for CCD cameras can still be used, they present specific problems for modern imagers. This CMOS-optimized B-Filter provides a direct solution to those legacy limitations.

    • Reflection Control: Legacy filters often lack the sophisticated anti-reflection coatings needed to prevent halos when paired with the reflective cover glass on many CMOS sensors.
    • IR Blocking: Many older RGB filters have weaker infrared (IR) blocking, which can lead to bloated, soft stars on highly IR-sensitive CMOS chips. This filter incorporates strong blocking outside the visual spectrum.
    • Color Balance: Filter sets designed for the spectral response of CCDs will often require significant exposure adjustments for CMOS sensors to achieve a proper color balance, complicating acquisition.

  • Why do I need a CMOS-optimized Blue filter like this RGB B-Filter?

    Modern monochrome CMOS sensors are highly sensitive and have reflective surfaces that can cause halos around bright stars with older filters. A CMOS-optimized filter uses advanced anti-reflection coatings to eliminate these artifacts and has a bandpass designed to match the sensor's spectral response for better color balance.

    Will this RGB B-Filter help reduce halos around bright stars like Vega?

    Yes. Halos around bright stars like Vega (Alpha Lyrae) are a common problem caused by reflections between the filter and the sensor. The anti-reflection coatings on this CMOS-optimized filter are specifically designed to suppress these internal reflections, leading to much cleaner data on high-contrast targets.

    How does this Blue filter help achieve a 1:1:1 color balance for LRGB imaging?

    The transmission curve of this filter is precisely matched with its corresponding Red and Green filters to complement the quantum efficiency of modern CMOS sensors. This ensures that the sensor receives a similar amount of signal through each filter over the same time period, allowing you to use equal exposure times (e.g., 180s for R, G, and B) for a natural color composite.

    Can I use this RGB B-Filter for visual observing?

    This is an imaging filter designed for astrophotography with a monochrome camera. Because it passes only the blue portion of the spectrum, the view through an eyepiece is dim and strongly colored, and its key benefits – halo suppression and a balanced 1:1:1 exposure ratio – only come into play when imaging.

    I'm imaging the Andromeda Galaxy (M31) from a light-polluted area. How does the CMOS-optimized design of this B-Filter help?

    The filter features steep cutoff slopes in its bandpass. This means it sharply blocks common sources of light pollution, like the orange glow from sodium vapor lights, which fall outside the blue spectrum. This increases the contrast between the faint blue star-forming regions in M31 and the sky background, even from suburban locations.

    Which size of the RGB B-Filter fits my filter wheel or drawer?

    The 1.25" (M28.5x0.6) and 2" (M48x0.75) versions are mounted in threaded cells and fit standard filter wheels, filter drawers and accessories that accept threaded filters of that size. The 31mm, 36mm and 50.4mm round and 50x50mm and 65x65mm square versions are unmounted and require a filter wheel or drawer made for that exact size. The unmounted 47.4mm version is intended for the Baader FCCT (or compatible holders) and will not thread into standard 2" filter holders.

  • 1.25" Round Mounted

    Filter Type Blue (B) for LRGB Imaging
    Size 1.25" (Mounted)
    Threads M28.5 x 0.6
    Series CMOS-Optimized

    2" Round Mounted

    Filter Type Blue (B) for LRGB Imaging
    Size 2" (Mounted)
    Threads M48 x 0.75
    Series CMOS-Optimized

    2" Round Unmounted Filter (Ø 47.4mm, FCCT)

    Filter Type Blue (B) for LRGB Imaging
    Size 2" (Unmounted)
    Diameter 47.4 mm
    System Compatibility Baader Planetarium FCCT
    Series CMOS-Optimized

    31mm Round Unmounted Filter

    Filter Type Blue (B) for LRGB Imaging
    Size 31 mm (Unmounted, Round)
    Series CMOS-Optimized

    36mm Round Unmounted Filter

    Filter Type Blue (B) for LRGB Imaging
    Size 36 mm (Unmounted, Round)
    Compatibility Filter wheels accepting 36 mm unmounted filters
    Series CMOS-Optimized

    50.4mm Round Unmounted Filter

    Filter Type Blue (B) for LRGB Imaging
    Size 50.4 mm (Unmounted, Round)
    Compatibility Large-format filter wheels for unmounted filters
    Series CMOS-Optimized

    50x50mm Square Filter

    Filter Type Blue (B) for LRGB Imaging
    Size 50 x 50 mm (Unmounted, Square)
    Sensor Coverage Full-frame (36x24mm) or larger
    Series CMOS-Optimized

    65x65mm Square Filter

    Filter Type Blue (B) for LRGB Imaging
    Size 65 x 65 mm (Unmounted, Square)
    Sensor Coverage Full-frame and medium-format sensors
    Series CMOS-Optimized

    • RGB B-Filter – CMOS-optimized (selected size)

      × 1

    • Filter Case or Protective Packaging (varies by size)

      × 1

  • Baader Planetarium Warranty