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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 G-Filter 1.25" – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter 2" – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium FCCT Filter – RGB G-Filter 2" unmounted (Ø 47.4 mm)– CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter 31mm – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter 31mm – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter 31mm – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter 50x50mm – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter 65x65mm – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter – CMOS-optimized
Baader Planetarium RGB G-Filter 1.25" – CMOS-optimized
Baader Planetarium RGB G-Filter 2" – CMOS-optimized
Baader Planetarium FCCT Filter – RGB G-Filter 2" unmounted (Ø 47.4 mm)– CMOS-optimized
Baader Planetarium RGB G-Filter 31mm – CMOS-optimized
Baader Planetarium RGB G-Filter 31mm – CMOS-optimized
Baader Planetarium RGB G-Filter 31mm – CMOS-optimized
Baader Planetarium RGB G-Filter 50x50mm – CMOS-optimized
Baader Planetarium RGB G-Filter 65x65mm – CMOS-optimized

Baader Planetarium RGB G-Filter – CMOS-optimized

by Baader Planetarium
SKU BAA-2961600G
$123.00 - $360.00
$123.00
$123.00 - $360.00
$123.00
Price Match Policy!
  • Green (G) Component for LRGB Color Imaging
  • Available in 1.25" & 2" Mounted, Round Unmounted and Square Sizes
  • Optimized for Modern CMOS Sensors
  • Suppresses Halos and Internal Reflections
  • High-Transmission Passband for Green Wavelengths
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • RGB G-Filter – CMOS-optimized

    Engineered for modern sensors, the Baader RGB G-Filter is the green component of a CMOS-optimized LRGB filter set, designed to capture the peak visual-wavelength data essential for a balanced color image. Available in mounted, round unmounted and square formats, this filter isolates a specific band of green light, forming the luminance backbone of a true-color astrophoto when combined with its red and blue counterparts.

    The Green Channel: Capturing Peak Visual Luminance

    In LRGB astrophotography, the green channel is fundamentally important because it aligns with the peak sensitivity of the human eye. Capturing strong, clean data with the G-filter is the key to producing images that appear visually natural and well-balanced. This filter ensures that the most visually significant part of the spectrum is recorded with high fidelity.

    A choice of sizes lets you match the filter to your camera and filter wheel: threaded 1.25" and 2" cells for standard filter wheels and drawers, 31mm and 36mm unmounted round filters for wheels built for those sizes, a 47.4mm unmounted filter for the Baader FCCT system, and 50.4mm round or 50x50mm and 65x65mm square filters whose large clear aperture prevents vignetting on full-frame and larger sensors.

    CMOS-Optimized Design for High-Reflectivity Sensors

    Modern CMOS sensors are notoriously reflective compared to older CCDs, which can cause halos and other internal reflections around bright stars. Baader's CMOS-optimized filters are specifically designed to combat this issue with advanced anti-reflection coatings and careful substrate selection.

    • Reflection Suppression: The coatings are engineered to minimize reflections between the filter and the sensor cover glass, resulting in cleaner star profiles and higher-contrast images.
    • Bandpass Precision: The filter's transmission curve is carefully shaped to provide excellent color separation from the red and blue channels while rejecting unwanted out-of-band wavelengths, ensuring pure color data for processing.

  • Why do I need a separate Baader RGB G-Filter for my monochrome camera?

    A monochrome camera captures only brightness, not color. To create a full-color image, you must shoot separate exposures through Red, Green, and Blue filters (like this Baader G-Filter) and then combine them during processing. The G-Filter is responsible for capturing all the green light from your target.

    What does "CMOS-optimized" mean for the Baader G-Filter?

    CMOS-optimized means the filter is designed with advanced anti-reflection coatings to prevent halos and internal reflections that are common with highly reflective CMOS sensor surfaces. It ensures clean, high-contrast data, especially around bright stars.

    How does the Baader G-Filter help when imaging the dust lanes in the Andromeda Galaxy (M31)?

    The green channel provides much of the luminance detail in broadband targets like galaxies. When imaging M31, the Baader G-Filter will capture high-contrast data in the galaxy's core and dust lanes, which can be used to sharpen the final color composite and reveal fine structural details.

    Which size of the Baader G-Filter do I need for my camera and filter wheel?

    Choose the size your filter holder accepts and that is large enough for your sensor. The 1.25" and 2" mounted filters thread into standard filter wheels and drawers. The 31mm and 36mm unmounted filters fit wheels made specifically for those diameters, and the 47.4mm unmounted filter is made for the Baader FCCT, not for standard 2" threaded wheels. For full-frame or larger sensors, especially with fast telescopes, the 50.4mm round or 50x50mm and 65x65mm square formats avoid vignetting (darkening of the corners).

    Can I use this Baader G-Filter with RGB filters from another brand?

    While you can, it's not recommended for optimal results. High-quality filter sets are designed to be "parfocal" (maintain focus when switched) and have carefully balanced transmission bands to ensure correct color balance with 1:1:1 exposure times. Mixing brands can lead to focus shift and difficulty in color balancing.

    What is the primary role of the green channel captured by the Baader G-Filter in a final LRGB image?

    The green channel's primary role is to define the image's luminance and detail, as it corresponds to the peak sensitivity of human vision. In processing, the G channel data is often weighted heavily or blended with the Luminance channel to enhance contrast and perceived sharpness in the final color image.

  • 1.25" Round Mounted

    Filter Type Green (G) Channel for RGB Imaging
    Size 1.25"
    Sensor Compatibility Optimized for CMOS Sensors

    2" Round Mounted

    Filter Type Green (G) Channel for RGB Imaging
    Size 2"
    Format Mounted
    Sensor Compatibility Optimized for CMOS Sensors

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

    Product FCCT Filter – RGB G-Filter
    Size 2" Class (Unmounted)
    Diameter 47.4 mm
    Mounting Unmounted
    Spectral Band Green (G)
    System Compatibility Baader Planetarium FCCT
    Sensor Optimization CMOS

    31mm Round Unmounted Filter

    Filter Type Green (G) Channel for RGB Imaging
    Size 31 mm
    Format Unmounted, Round
    Compatibility Filter wheels accepting 31 mm unmounted filters
    Sensor Compatibility Optimized for CMOS Sensors

    36mm Round Unmounted Filter

    Filter Type Green (G) Channel for RGB Imaging
    Size 36 mm
    Format Unmounted, Round
    Compatibility Filter wheels accepting 36 mm unmounted filters
    Sensor Compatibility Optimized for CMOS Sensors

    50.4mm Round Unmounted Filter

    Filter Type Broadband Color (Green)
    Size 50.4 mm
    Format Unmounted
    Optimized For CMOS Sensors

    50x50mm Square Filter

    Filter Type Green (G) Channel for RGB Imaging
    Size 50 x 50 mm
    Format Unmounted, Square
    Compatibility Large-format filter wheels
    Sensor Compatibility Optimized for CMOS Sensors

    65x65mm Square Filter

    Filter Type Green (G) Channel for RGB Imaging
    Size 65 x 65 mm
    Format Unmounted, Square
    Compatibility Large filter wheels for 65 mm square filters
    Sensor Compatibility Optimized for CMOS Sensors
  • Baader Planetarium Warranty