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William Optics M54 Camera Angle Rotator (CAA)
William Optics M54 Camera Angle Rotator (CAA)
William Optics M54 Camera Angle Rotator (CAA)

William Optics M54 Camera Angle Rotator (CAA)

by William Optics
SKU WO-M-CAA54
$119.00 - $119.00
$119.00
$119.00 - $119.00
$119.00
Price Match Policy!
  • 360° of precise framing rotation
  • Standard M54 male and female threads
  • Adds a minimal 30.2 mm to the optical path
  • Securely locks orientation for long exposures
1 in stock
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • William Optics M54 Camera Angle Rotator (CAA)

    The William Optics M54 Camera Angle Rotator (CAA) provides 360° of precise framing adjustment for your imaging train, inserting between your flattener and camera while adding only 30.2 mm to your optical path. This essential accessory allows you to perfectly compose targets like elongated galaxies or sprawling nebulae without loosening your camera or disrupting your optical alignment.

    360° Framing with a 30.2mm Optical Path

    Achieving the perfect image orientation is critical, and the WO M54 CAA makes it simple. A smooth rotational mechanism allows for fine, controlled adjustments to match your camera sensor to the dimensions of your target. The rotator's key design consideration is its 30.2 mm optical length, a fixed value that must be factored into your back focus calculations to ensure a flat field.

    • M54 Thread Standard: Features M54x0.75 male and female threads, ensuring compatibility with a wide ecosystem of William Optics flatteners, reducers, and many third-party cameras and accessories.
    • Precise Back Focus Integration: The 30.2 mm thickness is a known constant, allowing you to accurately subtract it from your required back focus distance and fill the remaining gap with standard M54 spacers.
    • Locking Mechanism: Once you've set your desired frame, a secure locking screw holds the rotator firmly in place, preventing any drift during a long imaging session.

  • How do I install the William Optics M54 CAA in my imaging train?

    The WO M54 CAA is designed to be threaded between two M54-compatible components. Typically, you would thread it directly onto the M54 output of your field flattener or reducer, and then attach your M54 spacers and camera to the female side of the rotator.

    Does the 30.2 mm optical length of the WO M54 Rotator affect my back focus?

    Yes, absolutely. The 30.2 mm optical length is a critical measurement that consumes part of your total back focus distance. If your flattener requires 55 mm of back focus, installing the rotator means you will need an additional 24.8 mm of spacers (55 - 30.2 = 24.8) between the rotator and your camera sensor to achieve a perfectly flat field.

    Is the William Optics M54 CAA compatible with non-William Optics telescopes?

    Yes. As long as your telescope's flattener, reducer, or camera system uses the standard M54x0.75 thread, the William Optics CAA will be compatible. It is not proprietary to William Optics telescopes.

    When would I use the WO M54 Camera Angle Rotator for imaging the Andromeda Galaxy (M31)?

    The Andromeda Galaxy (M31) is a very wide, elliptical target. To fit its full span onto a rectangular camera sensor, you often need to orient the long axis of your sensor with the long axis of the galaxy. The WO M54 CAA allows you to make this fine rotational adjustment to perfectly frame M31 without rotating your entire, heavier imaging train.

    Can I use the WO M54 CAA with a filter wheel and off-axis guider?

    Yes. The rotator is typically placed first in the imaging train after the flattener. This allows you to rotate the entire subsequent assembly—including the off-axis guider, filter wheel, and camera—as a single locked unit. This ensures your guide camera maintains its orientation relative to the main imaging camera.

    How does the WO M54 CAA lock its position once I have the correct framing?

    The William Optics M54 CAA features a knurled thumbscrew on its side. Once you have rotated your camera to the desired angle, you simply tighten this screw. This applies pressure and securely locks the rotational position, preventing any unwanted movement during your exposure sequence.

  • Input Connection M54 (male)
    Output Connection M54 (female)
    Optical Path Length 30.2 mm

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  • William Optics 2-Year Warranty