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William Optics 4" Extender for FLT Series
William Optics 4" Extender for FLT Series
William Optics 4" Extender for FLT Series

William Optics 4" Extender for FLT Series

par William Optics
UGC WO-P-M92EX
CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00
Égalisation de prix!
  • Adds 67 mm of optical length to your imaging train
  • Features M92 male and female threads for a secure connection
  • Designed for William Optics FLT 110 & FLT 132 refractors
  • Enables focus with filter wheels, OAGs, and other accessories
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE au Canada pour les commandes de plus de 500$.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • William Optics 4" Extender for FLT Series

    The William Optics 4" Extender provides a fixed 67 mm of optical length for imaging trains on FLT series telescopes like the FLT 110 and FLT 132. It connects via male and female M92 threads, ensuring a rigid, non-flexing connection between the focuser and your camera or flattener, which is critical for achieving sharp, round stars across the field.

    M92 Threads and 67mm Extension for FLT 110 & FLT 132

    Designed specifically for the William Optics FLT 110 and FLT 132 refractors, this 4" extender adds precisely 67 mm of back focus to your imaging setup. This additional length is often essential to reach focus with complex imaging trains that include accessories like filter wheels, off-axis guiders, and rotators.

    The robust M92 male and female threads provide a secure, direct-threaded connection to the telescope's 4" focuser. This eliminates the potential for tilt or flex that can occur with less secure slip-fit adapters, ensuring your entire imaging system remains perfectly aligned.

  • Will this 4" Extender help me reach focus with a filter wheel on my William Optics FLT 132?

    Yes, this is its primary purpose. The 67 mm of extension is designed to push the focal point outward, providing the necessary back focus to accommodate accessories like filter wheels and off-axis guiders that would otherwise prevent you from reaching focus.

    What are the thread specifications for the William Optics 4" Extender?

    The extender uses M92 threads. It features an M92 male thread on the light-in (telescope) side and an M92 female thread on the light-out (camera) side for a direct, secure connection.

    Is the William Optics 4" Extender compatible with telescopes other than the FLT 110 and FLT 132?

    While it is specifically engineered for the William Optics FLT 110 and FLT 132, it may work with other telescopes that feature a 4" focuser with a female M92 thread. You must verify your telescope's specific thread size and back focus requirements before purchasing.

    Why is it called a "4" Extender" if it only provides 67 mm of extension?

    The "4"" designation refers to the size of the focuser it is designed to mate with, such as the 4" focusers found on the FLT 110 and FLT 132 telescopes. The actual optical length it adds to the light path is 67 mm.

    I am trying to do prime focus imaging with a DSLR on my FLT 110 and can't reach focus. Is this extender the solution?

    It depends on which way you need to move the focuser. If you cannot reach focus because the focuser is racked all the way out, this 67 mm extender will provide the additional length needed to achieve a sharp image. If your focuser is racked all the way in, you need less back focus, and this extender will not help.

    Does the William Optics 4" Extender have any optical elements?

    No, this is a purely mechanical extender. It is a hollow tube designed only to increase the distance between the focuser and the camera. It contains no lenses and does not alter the focal length or focal ratio of your telescope.

  • Optical Length 67 mm
    Telescope Side Connection M92 (male)
    Camera Side Connection M92 (female)
    Compatibility William Optics FLT 110, FLT 132

    • 4" Extender (M92, 67mm)

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  • William Optics 2-Year Warranty