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March 14th: The store will be closed on Friday as we will be out all night to observe and image the total lunar eclipse! Good eclipse!
March 14th: The store will be closed on Friday as we will be out all night to observe and image the total lunar eclipse! Good eclipse!

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Askar 71F Quadruplet Flat-Field APO f/6.9

by Askar
SKU ASK-ASAPO71F
Original price $0
Original price $659.00 USD - Original price $659.00 USD
Original price
Current price $659.00
$659.00 USD - $659.00 USD
Current price $659.00 USD

Description

  • 71mm aperture, f/6.9 focal ratio quadruplet apochromatic refractor
  • Flat-field design optimized for wide-field astrophotography
Availability:
Backordered
Contact us to know when we will receive our next ones!

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More information

  • The Askar 71F Quadruplet Flat-Field APO f/6.9 is a high-performance apochromatic refractor telescope specifically designed for wide-field astrophotography. With its 71mm aperture and fast f/6.9 focal ratio, this telescope offers an excellent balance of light gathering power and field of view, making it ideal for capturing expansive deep-sky objects and star fields.

    Disclaimer

    Optimized for astrophotography. Additional accessories may be required for visual use. Check compatibility with your existing imaging equipment.

    Optical Design


    The 71F features a sophisticated quadruplet lens design, incorporating four precisely aligned elements to deliver superior color correction and a flat field. This apochromatic design effectively eliminates chromatic aberration and field curvature, ensuring sharp, high-contrast images across the entire field of view, which is crucial for astrophotography.

    Askar 71F Quadruplet Flat-Field APO f/6.9

    Imaging Performance


    With its 71mm aperture and 490mm focal length (f/6.9), the 71F excels in wide-field astrophotography. It's particularly well-suited for capturing large nebulae, extensive star fields, and expansive galaxy groups. The fast f/6.9 focal ratio allows for shorter exposure times, making it easier to gather data even under less-than-ideal sky conditions.

    Flat-Field Design


    The flat-field design of the 71F ensures that stars remain sharp and pinpoint from the center to the edges of the frame. This is particularly beneficial for astrophotographers using large sensors, as it eliminates the need for a separate field flattener.

    Build Quality


    Constructed with high-quality materials, including a precision-machined aluminum tube and dew shield. The robust build ensures stability and minimizes flexure, critical for long-exposure astrophotography. The retractable dew shield adds to its portability.

    Focuser


    Equipped with a high-precision dual-speed focuser, allowing for fine adjustments necessary for achieving perfect focus in astrophotography. The focuser is designed to handle heavy imaging payloads without slipping, ensuring consistent performance throughout long imaging sessions.

    Portability


    With its compact size and lightweight design, the 71F is highly portable, making it an excellent choice for astrophotographers who frequently travel to dark-sky sites. Its portability doesn't compromise its optical performance, offering a perfect balance for mobile imaging setups.

    Versatility


    While primarily designed for astrophotography, the Askar 71F can also be used for visual observations with appropriate accessories. It offers breathtaking wide-field views of star fields, nebulae, and larger deep-sky objects, making it a versatile instrument for various astronomical pursuits.

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