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Askar 80ED f/7 Doublet
Askar 80ED f/7 Doublet
Askar 80ED f/7 Doublet
Askar 80ED f/7 Doublet
Askar 80ED f/7 Doublet

Askar 80ED f/7 Doublet

par Askar
UGC ASK-ASF80ED
$399.00 - $399.00
$399.00
$399.00 - $399.00
$399.00
Égalisation de prix!
  • 560mm Focal Length
  • f/7 Focal Ratio
  • Triplet Objective with ED Glass
  • APS-C Corrected Image Circle
  • 55mm Back Focus
  • 0.42kg Weight
1 en stock
Expédition internationale
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Askar 80ED f/7 Doublet

    The Askar 80ED f/7 is built around a 560mm focal length triplet objective that incorporates one ED glass element for well-corrected images. It delivers a corrected image circle optimized for APS-C sensors and provides a standard 55mm of back focus from its M48x0.75 male thread. The entire optical system weighs just 0.42kg, establishing a highly portable core for a grab-and-go astrophotography rig.

    Triplet ED Optics: 560mm Focal Length at f/7

    The heart of the Askar 80ED is its air-spaced triplet objective lens, which includes an element of extra-low dispersion (ED) glass to minimize chromatic aberration. This design ensures that stars of different colors focus at the same point, resulting in sharp, high-contrast images without distracting color fringing around bright objects. The native 560mm focal length at f/7 provides an ideal image scale for many popular deep-sky targets, from open clusters to larger nebulae.

    Imaging Train: 55mm Back Focus for APS-C Sensors

    Askar engineered the 80ED for straightforward camera integration. The system provides a 55mm back focus distance measured from the base of the M48x0.75 thread, which is the industry standard for DSLR and mirrorless cameras when used with a corresponding T-ring. The corrected image circle is sized for APS-C sensors, covering the chips used in a vast majority of dedicated astronomy cameras and consumer DSLRs.

    • Standard Threads: The rear of the OTA terminates in both M54×0.75 and M48×0.75 threads, providing flexibility for connecting various accessories.
    • Integrated Filter Holder: The M48 connection includes internal threads, allowing you to mount standard 2-inch filters directly into the imaging train.
    • APS-C Limitation: While the image circle fully illuminates APS-C sensors, it is not designed for full-frame (35mm) sensors and will show significant vignetting at the edges of a larger format.

    System Modularity: A Lightweight 0.42kg Imaging Platform

    Weighing only 0.42kg, the Askar 80ED is exceptionally lightweight, making it a perfect match for portable tracking mounts that have limited payload capacity. This instrument is designed as the core of a flexible imaging system, with optional, dedicated focal reducers and flatteners available separately. These accessories allow you to alter the focal ratio for faster imaging and a wider field of view, adapting the telescope's performance to different celestial targets without compromising image quality.

  • What kind of astronomical objects is the Askar 80ED best suited for?

    With its 560mm focal length, the Askar 80ED excels at imaging medium-to-large deep-sky objects. It's ideal for targets like the Andromeda Galaxy (M31), the Orion Nebula (M42), and large open star clusters like the Pleiades (M45), framing them well on a typical APS-C sensor.

    Does the Askar 80ED support full-frame cameras?

    No, the Askar 80ED is designed with a corrected image circle specifically for APS-C sensors. While a full-frame camera can be attached, you will experience significant vignetting and distortion in the corners of the image.

    What do I need to connect my DSLR camera to the Askar 80ED?

    The Askar 80ED provides a standard 55mm back focus from its M48 thread. To connect a DSLR or mirrorless camera, you will need a standard M48 T-ring specific to your camera's lens mount (e.g., Canon EOS or Nikon F).

    Is the Askar 80ED a good choice for imaging the North America Nebula (NGC 7000)?

    Yes, especially when paired with an optional focal reducer. At its native 560mm focal length, you can capture detailed sections of the nebula. Adding a reducer provides a wider field of view, allowing you to fit the entire nebula and the adjacent Pelican Nebula (IC 5070) into a single frame with an APS-C sensor.

    Can I use the Askar 80ED for visual observing?

    While the Askar 80ED is optically optimized for astrophotography, it can certainly be used for visual astronomy. You will need to add a diagonal, an eyepiece holder, and eyepieces. Its ED triplet lens will provide sharp, high-contrast views of the Moon, planets, and bright deep-sky objects.

    How portable is the Askar 80ED for field use?

    Extremely portable. With a specified weight of just 0.42kg, the Askar 80ED is one of the lightest telescopes in its class. This makes it an ideal companion for lightweight star trackers and portable equatorial mounts for imaging sessions away from home.

  • Optical Design Triplet with one ED glass element
    Focal Length 560mm
    Focal Ratio f/7
    Image Circle APS-C
    Back Focus 55mm (from the base of M48 male thread)
    Weight 0.42 kg
    Rear Threads M54×0.75 and M48×0.75 (with internal M48 filter threads)
  • Askar 1-Year Warranty