Skip to content
Baader ACF DSLR Astro Conversion Filter - for Canon EOS 300
Baader ACF DSLR Astro Conversion Filter - for Canon EOS 300
Baader ACF DSLR Astro Conversion Filter - for Canon EOS 300
Baader ACF DSLR Astro Conversion Filter - for Canon EOS 300

Baader ACF DSLR Astro Conversion Filter - for Canon EOS 300

by Baader Planetarium
SKU BAA-2459211
CA$124.00 - CA$124.00
CA$124.00
CA$124.00 - CA$124.00
CA$124.00
Price Match Policy!
  • Designed for Canon EOS 300 DSLR Astro-Conversion
  • Dramatically Improved Spectral Transmission for Astrophotography
  • Unlocks Critical Hydrogen-Alpha (Hα) Wavelengths
  • Plane-Optically Polished for Maximum Image Fidelity
  • Replaces the Camera's Stock Internal Filter
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in Canada on orders over $500.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader ACF DSLR Astro Conversion Filter - for Canon EOS 300

    The Baader ACF 1 Astro Conversion Filter is engineered specifically for the Canon EOS 300, replacing the stock internal filter to dramatically improve spectral transmission for astrophotography. This plane-optically polished filter is the key to unlocking the deep-red hydrogen-alpha wavelengths essential for capturing the true structure and extent of emission nebulae.

    Unlocking H-alpha: The Purpose of the Baader ACF Filter

    A standard DSLR camera's internal filter is designed to block infrared light and a significant portion of the deep-red spectrum to produce pleasing daytime images. This same filter, however, aggressively cuts off the 656nm Hydrogen-alpha line, which is the dominant wavelength emitted by the vast majority of nebulae. The Baader ACF filter corrects this by replacing the stock filter with one that has an "astro-tuned" transmission curve, allowing this vital wavelength to reach your camera's sensor.

    With this filter installed, your Canon EOS 300 can capture the faint, glowing hydrogen gas in objects like the North American Nebula (NGC 7000) or the Rosette Nebula (NGC 2244), revealing details and structures that are simply invisible to an unmodified camera.

    Plane Optical Polishing: Maintaining Image Sharpness

    Inserting any filter into an optical path risks degrading the image, but the Baader ACF filter is manufactured to prevent this. It is plane-optically polished to a high standard, ensuring it does not introduce astigmatism, blur, or other aberrations into your images. This preserves the sharpness and resolution delivered by your telescope or camera lens.

    This level of optical quality means your stars remain tight, round points from edge to edge. The filter's only job is to alter the spectral transmission, not the geometric accuracy of the light cone, ensuring your final images are as sharp as your optics can deliver.

    Stock vs. Astro-Modified: What the ACF Filter Changes for Your Canon EOS 300

    Modifying your Canon EOS 300 with the Baader ACF filter fundamentally changes its behavior, turning it into a specialized instrument for astronomy. A stock camera will produce weak, muted reds when aimed at emission nebulae, often requiring extreme processing to show even a hint of structure. After modification, the H-alpha signal is dramatically stronger, making nebulae stand out with far less exposure time and noise.

    The primary trade-off is in daytime photography. The increased red sensitivity will shift the camera's color balance, requiring a custom white balance profile to produce natural-looking terrestrial images. For many, this modification dedicates the camera body to astrophotography, where its newfound sensitivity can be fully exploited.

  • What is the main benefit of installing the Baader ACF Filter in my Canon EOS 300?

    The primary benefit is a massive increase in sensitivity to the Hydrogen-alpha (Hα) wavelength at 656nm. This allows your Canon EOS 300 to capture the faint, red light from emission nebulae, which is almost completely blocked by the camera's original factory filter.

    How will the Baader ACF Filter change my images of the Orion Nebula (M42) with my Canon EOS 300?

    With an unmodified Canon EOS 300, the extensive outer loops of hydrogen gas in the Orion Nebula (M42) will appear faint and lack detail. After installing the Baader ACF filter, these structures will be significantly brighter and more defined in your exposures, revealing the full extent of the nebula with much greater contrast and color depth.

    Can I still use my Canon EOS 300 for normal daytime photography after installing the Baader ACF filter?

    Yes, but with a critical adjustment. The increased red sensitivity will give daytime images a strong red cast. To correct this, you must create a custom white balance profile using a grey card. While usable, many astrophotographers choose to dedicate the modified camera body to astronomical use.

    Why is "plane optical polishing" important for the Baader ACF conversion filter?

    Plane optical polishing ensures the filter is perfectly flat and free of optical defects. This is crucial because a low-quality filter can distort the light path, leading to blurred stars and loss of detail. Baader's polishing maintains the high-resolution performance of your telescope and lenses.

    I use my Canon EOS 300 with an 80mm refractor. Will the Baader ACF filter introduce any optical problems?

    No. Because the Baader ACF filter is plane-optically polished, it will not introduce any new aberrations like astigmatism or coma. It is designed to be optically transparent in terms of image geometry, so the sharp, high-contrast views from your 80mm refractor will be preserved.

    Is installing the Baader ACF filter a simple process?

    Installing a DSLR conversion filter is a delicate and complex procedure that involves disassembling the camera body in a dust-free environment. It carries a risk of damaging the sensor or camera electronics. We strongly recommend having the installation performed by an experienced professional.

  • 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 Planetarium Warranty