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William Optics M48 Filter Adapters for Cat Eyes Binoculars
William Optics M48 Filter Adapters for Cat Eyes Binoculars
William Optics M48 Filter Adapters for Cat Eyes Binoculars

William Optics M48 Filter Adapters for Cat Eyes Binoculars

by William Optics
SKU WO-AD-2X42-M48
$9.00 - $9.00
$9.00
$9.00 - $9.00
$9.00
Price Match Policy!
  • Enables use of standard 2-inch (M48 x 0.75) filters
  • Connects to the M44.5 x 0.75 objective threads on Cat Eyes Binoculars
  • Adds a minimal 6 mm of optical length to the light path
  • Precision-machined from black-anodized aluminum
  • Sold individually
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • M48 Filter Adapters for Cat Eyes Binoculars

    The M48 Filter Adapter for Cat Eyes Binoculars directly converts the binocular's native M44.5 x 0.75 objective thread to the standard M48 x 0.75 (2-inch) filter thread, adding only 6 mm of optical length to your optical train. This simple, robust adapter unlocks the ability to use a vast range of nebula, light pollution, and color filters to dramatically enhance your visual observing.

    Add 2-inch (M48) Filter Capability to Your Cat Eyes Binoculars

    This adapter solves the primary challenge of using filters with Cat Eyes Binoculars by providing a secure M48 threaded interface. By attaching nebula filters, you can significantly increase the contrast between faint deep-sky objects and the light-polluted sky, revealing detail that would otherwise be invisible. The adapter adds just 6 mm to the optical path, a minimal length designed to maintain focus capability.

    • Direct Connection: The female M44.5 x 0.75 threads are designed for a perfect fit on the objective housing of Cat Eyes Binoculars.
    • Universal Filter Mount: The male M48 x 0.75 threads accept any standard 2-inch astronomy filter from any manufacturer.
    • Durable Construction: Machined from a single piece of black-anodized aluminum to reduce internal reflections and withstand years of field use.

  • How does using the M48 Filter Adapter help when viewing the Orion Nebula (M42) with my Cat Eyes Binoculars?

    This adapter allows you to attach a UHC or other light pollution filter directly to your Cat Eyes Binoculars. For a target like the Orion Nebula (M42), this darkens the sky background and selectively passes the light emitted by the nebula, making its faint, extended structures stand out with much higher contrast.

    Will the 6mm optical length of the M48 adapter cause focusing issues on my Cat Eyes Binoculars?

    For most visual applications, the 6 mm of added optical length is well within the focus travel range of the Cat Eyes Binoculars. This minimal extension is specifically designed to ensure you can still reach a sharp focus with your filters installed.

    What kind of filters can I use with the M48 Filter Adapter for Cat Eyes Binoculars?

    You can use any standard 2-inch mounted astronomy filter. The M48 x 0.75 thread is the universal standard for this filter size, giving you access to a wide variety of options:

    • Broadband Light Pollution Filters (LPR)
    • Narrowband Filters (UHC, OIII, H-Beta)
    • Color Filters for planetary viewing

    Does this M48 adapter thread directly onto the objective lens of the Cat Eyes Binoculars?

    Yes. The adapter's female M44.5 x 0.75 side is engineered to thread directly onto the objective cell of the Cat Eyes Binoculars, typically replacing a factory-installed protective ring or dew shield extension. The male M48 x 0.75 side then faces outward to accept your filter.

    Are these M48 Filter Adapters sold individually or as a pair?

    These adapters are sold individually. To use filters on both optical tubes of your Cat Eyes Binoculars for a balanced view, you will need to purchase two adapters.

    Is the M48 Filter Adapter compatible with other brands of binoculars?

    It is specifically designed for the M44.5 x 0.75 threads found on Cat Eyes Binoculars. It is highly unlikely to be compatible with other binoculars unless they happen to use the exact same, non-standard objective thread size.

  • Filter Thread (Light-In) M48 × 0.75 (Standard 2-inch)
    Binocular Thread (Light-Out) M44.5 × 0.75
    Optical Path Length 6 mm

    • M48 Filter Adapter for Cat Eyes Binoculars

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  • David Astro General Accessories Warranty