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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.
Explore Scientific 0.8x Focal Reducer
Explore Scientific 0.8x Focal Reducer
Explore Scientific 0.8x Focal Reducer
Explore Scientific 0.8x Focal Reducer
Explore Scientific 0.8x Focal Reducer
Explore Scientific 0.8x Focal Reducer

Explore Scientific 0.8x Focal Reducer

par Explore Scientific
UGC ES-FR0.8x
$139.99 - $139.99
$139.99
$139.99 - $139.99
$139.99
Égalisation de prix!
  • Reduces focal length by a factor of 0.8x for wider fields of view
  • Engineered for refractors with focal ratios from f/5 to f/7
  • Provides 55mm (+/- 2mm) of back focus for correct spacing
  • Features standard M42x0.75 T-threads for easy camera attachment
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE aux USA pour les commandes de plus de 350$.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Explore Scientific 0.8x Focal Reducer

    The Explore Scientific 0.8x Focal Reducer converts refractors in the f/5 to f/7 range into faster, wider-field astrographs, reducing your scope's effective focal ratio for significantly shorter exposures. This corrector provides a precise 55mm (+/- 2mm) of back focus and connects to your camera using standard M42 T-threads, creating a simple and rigid imaging train for capturing large nebulae and star fields.

    Faster, Wider Imaging: 0.8x Reduction for f/5-f/7 Refractors

    By reducing your telescope's focal length by a factor of 0.8x, this accessory broadens your field of view, allowing you to frame large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety. More importantly, it makes your optical system faster, concentrating the same amount of light onto a smaller area of your camera's sensor. An f/6 refractor becomes an f/4.8 system, enabling you to capture the same level of detail in nearly 40% less time.

    Precise Spacing for Sharp Stars: 55mm Back Focus and M42 Threads

    Achieving a flat field with sharp stars to the edge requires precise spacing between the reducer and the camera sensor. This reducer is designed with a 55mm back focus distance, the industry standard for DSLR cameras connected via a T-ring, which simplifies setup. The body is threaded to accept any standard 42mm (M42x0.75) T-ring or T-threaded accessory, ensuring a secure, non-flexing connection to your imaging equipment.

  • What does the Explore Scientific 0.8x Focal Reducer do to my telescope's focal ratio?

    The Explore Scientific 0.8x Focal Reducer multiplies your telescope's native focal ratio by 0.8. For example, if you have an f/7 refractor, using this reducer will convert it into a faster f/5.6 imaging system (7 x 0.8 = 5.6). This allows for shorter exposure times and a wider field of view.

    How do I achieve the correct 55mm spacing with the Explore Scientific 0.8x Reducer?

    The 55mm back focus is the required distance from the shoulder of the reducer's threads to your camera's sensor. This is easily achieved with most cameras:

    • DSLR/Mirrorless Cameras: A standard T-ring for your camera model is typically all that is needed, as the combination of the camera's flange distance and the T-ring height equals 55mm.
    • Dedicated Astronomy Cameras: You will need to use a combination of M42 extension tubes to build up the distance from your camera's sensor to the reducer. Check your camera's documentation for its sensor depth to calculate the required extension length.

    Is the Explore Scientific 0.8x Reducer compatible with my f/8 refractor?

    This reducer is optically optimized for refractors in the f/5 to f/7 range. While it may thread into an f/8 or slower telescope, performance is not guaranteed. Using it outside the recommended range can lead to field curvature or other aberrations, particularly at the edges of the image.

    Will the Explore Scientific 0.8x Reducer work for visual observing?

    No, this is an imaging-only accessory. Focal reducers are designed to project a corrected, flat image plane directly onto a camera sensor. They are not designed to work with eyepieces and will not reach focus for visual use.

    How will this 0.8x reducer help me image the Andromeda Galaxy (M31) with my 80mm f/6 refractor?

    An 80mm f/6 refractor has a 480mm focal length. The Explore Scientific 0.8x Reducer will shorten this to 384mm (f/4.8). This wider field of view is crucial for fitting the entire 3-degree span of the Andromeda Galaxy (M31) onto a camera with an APS-C or smaller sensor, which would be impossible at the native focal length.

    Can I use this reducer to capture the full extent of the North American Nebula (NGC 7000) with a 102mm f/7 refractor?

    Yes. A 102mm f/7 refractor has a 714mm focal length. The Explore Scientific 0.8x Reducer brings this down to about 571mm (f/5.6). This reduction is essential for capturing the sprawling expanse of the North American Nebula (NGC 7000) and the adjacent Pelican Nebula (IC 5070) in a single frame, especially with popular APS-C sized sensors.

  • Reduction Factor 0.8x
    Recommended Telescope F/Ratio f/5 to f/7 Refractors
    Back Focus 55mm (+/- 2mm)
    Camera Connection Thread M42 x 0.75 (T-Thread)
    GTIN 811803035881
  • Explore Scientific Warranty