Skip to content
July 1st: Store will be closed for Canada Day. Orders placed that day will ship on July 2nd.
July 1st: Store will be closed for Canada Day. Orders placed that day will ship on July 2nd.
Celestron Reducer Lens .7x - EdgeHD 925
Celestron Reducer Lens .7x - EdgeHD 925
Celestron Reducer Lens .7x - EdgeHD 925
Celestron Reducer Lens .7x - EdgeHD 925

Celestron Reducer Lens .7x - EdgeHD 925

by Celestron
SKU CEL-94245
$439.00 - $439.00
$439.00
$439.00 - $439.00
$439.00
Price Match Policy!
  • Reduces focal ratio by a factor of 0.7x for faster imaging
  • 4-element design maintains the native flat-field performance of the EdgeHD 9.25"
  • Provides an optimal back focus of 146mm for cameras and accessories
  • Optimized for a 42mm image circle to illuminate full-frame sensors
  • Features Lanthanum glass elements to minimize chromatic aberration
1 in stock
Worldwide Shipping
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Celestron Reducer Lens .7x - EdgeHD 925

    The Celestron Reducer Lens .7x for the EdgeHD 9.25" is a custom-engineered 4-element optic that transforms your telescope into a faster, wider imaging system. This reducer provides a generous 146mm of back focus, allowing complex imaging trains while maintaining the award-winning flat-field correction of the EdgeHD optical design from edge to edge.

    A 0.7x Reduction Factor with 4-Element Flat-Field Correction

    This dedicated reducer converts your f/10 EdgeHD 9.25" into an f/7 system, effectively cutting your required exposure time in half to achieve the same image brightness. The 4-element optical layout is specifically designed to work with the EdgeHD optics, ensuring the pinpoint stars across a flat field are preserved. This means you can capture wide-field images of large galaxies and nebulae with a 43% wider field of view without sacrificing image quality at the edges.

    Lanthanum Glass Elements for High-Contrast Imaging

    Unlike generic reducers, the Celestron .7x Reducer uses high-index, exotic Lanthanum glass elements. This "rare earth" glass provides superior correction of chromatic aberration, resulting in images with higher contrast and neutral color balance. All air-to-glass surfaces are fully multi-coated for maximum light transmission, and the lens edges are blackened to eliminate internal reflections that can reduce image contrast.

    Full-Frame Ready with 146mm of Optimal Back Focus

    Engineered for modern astrophotography, this reducer features a 60mm clear aperture and produces an optimized 42mm image circle, fully illuminating large full-frame CCD and CMOS sensors without vignetting. It threads directly onto the EdgeHD 9.25" optical tube's 3.25" port, creating a rigid connection. The design provides an optimal back focus distance of 146mm, accommodating accessories like off-axis guiders, filter wheels, and a wide range of cameras.

  • What is the main benefit of the Celestron .7x Reducer for my EdgeHD 9.25"?

    The primary benefit is speed. By converting your telescope from f/10 to f/7, it reduces your exposure time by 50%. It also widens your field of view by 43%, allowing you to fit larger celestial objects, like the Andromeda Galaxy (M31), into a single frame.

    Why is a dedicated EdgeHD reducer better than a generic one?

    The EdgeHD optical design produces a very flat, coma-free field. A generic reducer is not designed to preserve this correction and will introduce field curvature and other aberrations. The Celestron .7x Reducer is a 4-element system custom-designed to work with the EdgeHD 9.25" optics to maintain its signature flat-field performance across the entire image.

    How does the Celestron .7x Reducer help when imaging the Orion Nebula (M42) with an EdgeHD 925?

    The Orion Nebula (M42) is a large and bright target. The 0.7x reduction allows you to capture the full expanse of the nebula, including its fainter outer structures, in a single shot. The faster f/7 focal ratio significantly shortens the sub-exposure times needed to capture the faint details without blowing out the bright core of the Trapezium cluster.

    What does the 146mm back focus on the EdgeHD 925 reducer allow me to do?

    The 146mm back focus is the distance required from the reducer's rear flange to your camera sensor for optimal performance. This generous distance provides ample room to install a full imaging train, including an off-axis guider (OAG), a filter wheel, and any necessary adapters, without running out of space.

    Will this reducer work with a full-frame camera on my EdgeHD 9.25"?

    Yes. The reducer is designed with a 60mm clear aperture and produces a 42mm image circle. This is large enough to fully illuminate typical full-frame sensors (which have a diagonal of ~43mm) with minimal vignetting, making it an excellent choice for full-frame imaging.

    Is it difficult to attach the .7x Reducer to the EdgeHD 9.25" telescope?

    No, it's straightforward. The reducer threads directly onto the large 3.25" threaded baffle tube port on the rear cell of the EdgeHD 9.25". This provides a secure, flexure-free connection that is essential for sharp imaging.

  • Optical Design 4-Element
    Compression Factor 0.7x
    Optimal Back Focus 146mm (5.75")
    Image Circle 42mm
    Clear Aperture 60mm
    Glass Type Lanthanum Elements
    Optical Coatings Fully Multi-Coated
    Housing Machined Aluminum
    Weight 2.3 lbs (1.47 kg)

    • Reducer Lens .7x for EdgeHD 9.25"

      × 1

    • Threaded Metal Dust Cap (Front)

      × 1

    • Threaded Metal Dust Cap (Rear)

      × 1

  • Celestron 2-Year Limited Warranty