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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Askar 0.7x Universal Reducer for 107PHQ/130PHQ/151PHQ

Askar 0.7x Universal Reducer for 107PHQ/130PHQ/151PHQ

by Askar
SKU ASK-ASF107130RE
$384.00 - $384.00
$384.00
$384.00 - $384.00
$384.00
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  • 0.7x Focal Reduction Factor
  • 44mm Full-Frame Image Circle
  • Maintains a Standard 55mm Backfocus
  • 3-Element Air-Spaced Design with ED Glass
  • Optimized for Askar 107PHQ, 130PHQ, and 151PHQ Telescopes
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Askar 0.7x Universal Reducer for 107PHQ/130PHQ/151PHQ

    The Askar 3” 0.7x Full-Frame Reducer transforms the 107PHQ, 130PHQ, and 151PHQ astrographs into faster, wider-field instruments perfect for deep-sky imaging. Its 3-element optical design incorporates ED glass to deliver a corrected 44mm image circle, while maintaining the industry-standard 55mm backfocus for easy integration with your existing camera and filter wheel setup. This reducer effectively shortens exposure times by increasing the light-gathering power of your f/7 system to a rapid f/4.9.

    Faster Imaging at f/4.9: A 0.7x Triplet ED Reducer

    By reducing the native f/7 focal ratio of the PHQ series telescopes to f/4.9, this 0.7x reducer cuts required exposure times nearly in half. This allows you to gather more signal on faint targets in less time, maximizing your productivity during short imaging windows. The air-spaced triplet optical design, which includes one element of extra-low dispersion (ED) glass, ensures sharp, high-contrast images with excellent color correction across the field.

    Full-Frame Coverage: A Corrected 44mm Image Circle

    Engineered specifically for large-format sensors, this reducer illuminates a 44mm image circle. This is large enough to cover full-frame (36x24mm) CMOS and CCD sensors without vignetting, ensuring your entire frame is evenly lit from corner to corner. You can capture vast nebulae like the Veil Nebula complex or the Andromeda Galaxy (M31) in their entirety, without sacrificing image brightness or star quality at the edges of your frame.

    Seamless Integration: 55mm Backfocus and Multi-Thread Adapters

    Askar designed this reducer for straightforward integration into any standard imaging train. It provides a precise 55mm backfocus, the common standard for DSLRs, mirrorless cameras, and dedicated astronomy cameras with a filter wheel. The reducer includes M68, M54, and M48 thread adapters, giving you the flexibility to connect to virtually any focuser, off-axis guider, or camera system without needing to source additional parts.

  • What does the Askar 0.7x reducer do to the focal length of the Askar 130PHQ?

    The Askar 130PHQ has a native focal length of 1000mm at f/7.7. The 0.7x reducer will shorten its focal length to 700mm and change the focal ratio to a much faster f/5.4, allowing for wider fields of view and significantly shorter exposure times.

    Is the Askar 0.7x reducer compatible with full-frame cameras?

    Yes. It is designed to produce a corrected 44mm image circle, which is large enough to fully illuminate a standard full-frame sensor (36x24mm) without significant vignetting, providing sharp stars across the entire frame.

    How do I connect my camera to the Askar 0.7x Universal Reducer?

    The reducer is designed for a standard 55mm backfocus from its rearmost flange. It includes M68, M54, and M48 adapters, allowing you to directly connect most dedicated astronomy cameras, DSLRs (with a standard 44mm T-ring), and filter wheels using common extension tubes.

    Will this reducer introduce chromatic aberration to my Askar 107PHQ?

    No. The reducer features a 3-element optical design that includes one ED (Extra-low Dispersion) glass element. This design actively corrects for chromatic aberration, ensuring that the excellent color fidelity of the 107PHQ's quadruplet objective is maintained.

    How does the Askar 0.7x reducer help when imaging large targets like the North American Nebula (NGC 7000)?

    On a telescope like the Askar 151PHQ (1057mm focal length), the native field of view is too narrow to frame the entire North American Nebula. By reducing the focal length to approximately 740mm, the 0.7x reducer expands the field of view, allowing you to capture the entire nebula and the adjacent Pelican Nebula (IC 5070) in a single shot with a full-frame camera.

    Can I use the Askar 0.7x reducer for visual observing?

    This accessory is designed and optically corrected specifically for astrophotography. While you might be able to reach focus with some long-focal-length eyepieces, it is not optimized for visual use and will likely result in suboptimal views. Its primary purpose is to create a flat, corrected field for a camera sensor.

  • Reduction Factor 0.7x
    Compatible Telescopes Askar 107PHQ, 130PHQ, 151PHQ
    Optical Design 3-element air-spaced triplet with one ED element
    Image Circle 44mm
    Backfocus 55mm
    Connection to Focuser 3-inch
    Output Thread Adapters M68x1, M54x0.75, M48x0.75
    Maximum Diameter 80mm
  • Askar 1-Year Warranty