Skip to content
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 ACF DSLR Astro Conversion Filter - for Canon EOS 350D/10D/20D/30D

Baader ACF DSLR Astro Conversion Filter - for Canon EOS 350D/10D/20D/30D

by Baader Planetarium
SKU BAA-2459212
$128.00 - $128.00
$128.00
$128.00 - $128.00
$128.00
Price Match Policy!
  • Designed for Canon EOS 350D, 10D, 20D, and 30D DSLRs
  • Improves Spectral Transmission for Astrophotography
  • Unlocks Sensitivity to Hydrogen-Alpha (Hα) Nebulae
  • Plane-Optically Polished to Maintain Image Sharpness
  • Replaces the Camera's Stock Internal Low-Pass Filter
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader ACF DSLR Astro Conversion Filter - for Canon EOS 350D/10D/20D/30D

    The Baader ACF DSLR Astro Conversion Filter is a direct replacement for the stock low-pass filter in Canon EOS 350D, 10D, 20D, and 30D cameras. This plane-optically polished filter unlocks your DSLR's true deep-sky potential by providing improved spectral transmission, especially in the critical Hydrogen-alpha wavelength, turning a standard camera into a dedicated astronomical imaging tool.

    Unlocking H-Alpha for Deep-Sky Astrophotography

    Standard DSLR cameras include an internal filter that aggressively blocks infrared light to ensure correct color balance for daytime photography. A side effect is that this filter also cuts off the vital 656nm Hydrogen-alpha line, the wavelength in which most emission nebulae shine brightest. The Baader ACF filter is engineered to replace the stock filter, providing a spectral window that allows this deep red light to reach your camera's sensor.

    By installing this filter, you convert your camera into a powerful instrument for capturing faint, red nebulosity. Objects like the North American Nebula (NGC 7000) and the Rosette Nebula (NGC 2237), which are nearly invisible to an unmodified camera, will register with rich detail and contrast, revealing the vast hydrogen clouds that populate our galaxy.

    Plane-Polished Glass for Maintained Sharpness

    Placing any new optical element in a camera's light path carries the risk of degrading image resolution if not manufactured to high standards. Baader addresses this by ensuring the ACF filter is plane-optically polished. This process results in surfaces that are exceptionally flat and parallel, preventing any distortion of the focal plane.

    This attention to optical quality means your stars remain pinpoint and fine details are preserved across the entire frame. The filter's purpose is to improve spectral response without compromising the sharpness your telescope and camera sensor are capable of delivering, ensuring your final images are both sensitive and sharp.

  • What is the purpose of the Baader ACF Astro Conversion Filter for my Canon 20D?

    This filter replaces your Canon 20D's original internal filter, which blocks most of the red light from deep-sky nebulae. The Baader ACF filter allows this critical Hydrogen-alpha light to pass through, dramatically increasing your camera's sensitivity for astrophotography of emission nebulae.

    Will installing the Baader ACF filter change how my Canon 350D works for daytime photography?

    Yes. After this modification, your camera's color balance will be strongly shifted toward red. While it's possible to correct this with a custom white balance, the camera is best considered a dedicated astronomy tool post-conversion. Autofocus with standard camera lenses may also be affected.

    Why is this Baader filter better than just removing the stock filter from my Canon 10D?

    Simply removing the stock filter alters the camera's required back focus distance, making it impossible to reach infinity focus with many lenses and telescopes. The Baader ACF filter is a plane-parallel replacement that maintains the correct optical path length, ensuring sharp focus while also protecting the exposed CMOS sensor from dust.

    What objects will I image better with a Canon 30D modified with the Baader ACF filter?

    You will see the most significant improvement on emission nebulae rich in Hydrogen-alpha. Expect stunning results on targets such as:

    • The Orion Nebula (M42)
    • The Lagoon Nebula (M8)
    • The North American Nebula (NGC 7000)
    • The California Nebula (NGC 1499)

    Is the installation of the Baader ACF DSLR Astro Conversion Filter reversible?

    The modification requires careful disassembly of your DSLR. While it is technically possible to reverse the process if you save the original filter, it is a delicate and complex procedure that carries a significant risk of damaging the camera. For this reason, it is generally considered a permanent modification.

    What does "plane optically polished" mean for the Baader ACF filter?

    It means the filter's surfaces are manufactured to be extremely flat and perfectly parallel to each other. This is a critical quality feature that prevents image degradation. It ensures the filter will not introduce any distortions or blur, preserving the full sharpness and resolution of your optical system.

  • Filter Type DSLR Astro Conversion Filter (ACF)
    Compatible Cameras Canon EOS 350D, 10D, 20D, 30D
    Primary Purpose Increases Hydrogen-Alpha (Hα) Sensitivity
    Optical Quality Plane-Optically Polished
    Filter size other
    Filter shape rectangular
    Single or Set? Single Filter
    Filter mounted Unmounted
    Filter Usage Color Correction, H-alpha, IR-Cut, UV-Cut
    Transmission Range 400 – 700 nm
    AR-Coating dielectrically coated, planeoptically polished

    • Baader ACF DSLR Astro Conversion Filter

      × 1

  • Baader Planetarium Warranty