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SharpStar 76EDPH 0.8x Focal Reducer
SharpStar 76EDPH 0.8x Focal Reducer

SharpStar 76EDPH 0.8x Focal Reducer

by SharpStar Optics
SKU SSO-76EDPHFR
$265.00 - $265.00
$265.00
$265.00 - $265.00
$265.00
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  • Converts 76EDPH to a fast f/4.5 focal ratio
  • Produces a 44mm image circle for full-frame sensors
  • Standard 55mm back focus for easy camera integration
  • Three-element air-spaced optical design
  • Adds only 0.5kg to the imaging train
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • SharpStar 76EDPH 0.8x Focal Reducer

    The SharpStar 0.8x Focal Reducer is engineered specifically to convert the 76EDPH telescope into a fast f/4.5 astrograph, illuminating a full 44mm image circle for large-format sensors. This three-element reducer provides a standard 55mm back focus from its M48 threads, measures 77mm in length, and adds only 0.5kg to your imaging train.

    Transform Your 76EDPH into an f/4.5 Astrograph

    By reducing the native focal ratio of the 76EDPH to f/4.5, this corrector significantly shortens required exposure times, allowing you to capture more signal on faint deep-sky objects in a single session. The dedicated optical design is precisely matched to the 76EDPH, ensuring sharp stars across the entire field of view.

    • Dedicated Design: Mates directly to the 76EDPH focuser via an M74×1 thread for a secure, flex-free connection.
    • Three-Element Optics: The air-spaced triplet lens structure is fully multi-coated to maximize light transmission and suppress internal reflections for high-contrast images.

    A 44mm Image Circle for Full-Frame Sensors

    This reducer delivers a corrected, flat field across a 44mm image circle, which is large enough to accommodate full-frame (24x36mm) CMOS and CCD sensors without significant vignetting. This allows you to capture expansive targets like the Andromeda Galaxy (M31) or the Rho Ophiuchi cloud complex in a single frame.

    55mm Back Focus and 360° Rotation for Easy Framing

    Integration into your existing imaging setup is straightforward. The reducer provides the industry-standard 55mm of back focus from its M48x0.75 camera connection, accommodating most filter wheels, off-axis guiders, and astronomy cameras with minimal adapters. An integrated 360° rotator lets you perfectly frame your target without having to loosen the camera and risk optical tilt.

    • Standard M48 Threads: The camera-side connection uses M48 threads, which also accept standard 2" astronomy filters.
    • Precise Composition: The built-in rotator allows for fine adjustments to your image orientation, a critical feature for capturing mosaics or aligning with celestial coordinates.

  • What does the 0.8x Reducer do for my SharpStar 76EDPH?

    This reducer transforms your SharpStar 76EDPH into a faster, wider imaging instrument. It changes the focal ratio to f/4.5, which reduces your exposure times by about 36% and provides a wider field of view to capture larger celestial objects.

    Will the 76EDPH 0.8x Reducer work with my full-frame camera?

    Yes. The reducer is designed to produce a flat, corrected 44mm image circle, which fully illuminates standard 35mm full-frame sensors (e.g., Sony IMX571 or IMX455 based cameras) without significant light fall-off at the corners.

    How do I connect my camera and accessories to the SharpStar 76EDPH reducer?

    The reducer has standard M48x0.75 male threads on the camera side and provides 55mm of back focus. This is the standard distance for many DSLR/mirrorless cameras with a T-ring, as well as dedicated astronomy cameras when combined with filter wheels and off-axis guiders.

    Can I use 2" filters with the 76EDPH 0.8x Reducer?

    Yes, the M48 threads on the camera side of the reducer are designed to accept standard 2" (M48x0.75) filters. You can thread a filter directly onto the reducer before attaching your camera or filter wheel.

    How does the f/4.5 focal ratio help when imaging faint targets like the North American Nebula (NGC 7000) with the 76EDPH?

    The North American Nebula (NGC 7000) is a large, faint emission nebula. The faster f/4.5 focal ratio allows your camera sensor to collect photons more quickly compared to the telescope's native f-ratio. This means you can achieve a strong signal-to-noise ratio with shorter sub-exposures, reducing the demands on your mount's tracking accuracy.

    I'm using an APS-C camera with my 76EDPH. Is the 44mm image circle of this reducer still beneficial?

    Absolutely. While an APS-C sensor is smaller than the 44mm image circle, using a reducer designed for a larger field ensures exceptional field flatness and star correction across your entire sensor. You will experience very tight, round stars from corner to corner, well within the "sweet spot" of the reducer's optical correction.

  • Application SharpStar 76EDPH Astrograph
    Reduced Focal Ratio f/4.5
    Image Circle 44mm
    Lens Design Three-element air-spaced
    Back Focus 55mm from M48 thread
    Length 77mm (including M48 thread)
    Outer Diameter 88mm
    Coatings Full-surface multi-layer coating
    Weight 0.5kg
  • Askar 1-Year Warranty