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Askar 1x Field Flattener for 120APO

Askar 1x Field Flattener for 120APO

par Askar
UGC ASK-ASKFL12010
$221.87 - $221.87
$221.87
$221.87 - $221.87
$221.87
Égalisation de prix!
  • Designed specifically for the Askar 120APO Telescope
  • 1x Magnification Factor
  • Triplet Optical Design
  • Maintains Native f/7 Focal Ratio
  • Standard 55mm Back Focus
  • Weighs 0.75kg
1 en stock
Expédition internationale
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Askar 1x Field Flattener for 120APO

    The Askar 1x Field Flattener for the 120APO is a dedicated triplet corrector that maintains the telescope's native 840mm focal length and f/7 focal ratio. It establishes a standard 55mm back focus from its M48 male thread, ensuring compatibility with common imaging trains. Weighing 0.75kg, it provides robust optical correction without significantly altering the instrument's balance.

    Triplet Optics: Correcting the 120APO's f/7 Field Edge-to-Edge

    This 1x flattener is engineered specifically for the Askar 120APO, using a triplet optical design to eliminate field curvature and coma across large imaging sensors. By maintaining the telescope's native f/7 focal ratio, it prevents any change in image scale or exposure times. The result is a perfectly flat field, rendering stars as sharp points from the center to the corners of a full-frame sensor.

    Mechanical Design: 55mm Back Focus and Integrated Filter Threads

    Integration into your imaging train is straightforward, with a standard 55mm back focus measured from the base of the M48 male thread. The camera side includes both M54x0.75 and M48x0.75 adapters, and the M48 adapter features internal threads for 2-inch filters, allowing you to add light pollution or narrowband filters without extra spacers. The entire 0.75kg housing is CNC-machined for precise alignment and includes threaded metal caps for protection.

  • Does the Askar 1x Flattener change the focal length of the 120APO?

    No. As a 1x flattener, it is designed to maintain the Askar 120APO's native 840mm focal length and f/7 focal ratio. It corrects for field curvature without altering the image scale.

    What is the back focus for the Askar 120APO 1x Flattener?

    The required back focus is a standard 55mm, measured from the base of the male M48x0.75 thread on the included adapter. This simplifies connecting most DSLRs (with a T-ring) and dedicated astronomy cameras with filter wheels.

    How do I attach a 2-inch filter to the Askar 120APO Flattener?

    The flattener comes with an M48 adapter that has internal M48x0.75 threads. You can screw a standard 2-inch mounted filter directly into this adapter before attaching your camera.

    Can I use this flattener with a full-frame camera on my Askar 120APO to image the Andromeda Galaxy (M31)?

    Yes, this flattener is designed to fully illuminate and correct the field for full-frame sensors. When paired with the Askar 120APO's 840mm focal length, it provides an ideal image scale for large targets like the Andromeda Galaxy (M31) or the North America Nebula (NGC 7000), ensuring sharp stars across the entire frame.

    What adapters are included with the Askar 1x Flattener for the 120APO?

    The flattener provides two connection options on the camera side: a native M54×0.75 thread and an included adapter to step down to a standard M48×0.75 male thread for connecting most imaging equipment.

    Will this 0.75kg flattener affect the balance of my Askar 120APO setup?

    With a weight of 0.75kg, the flattener will add some weight to the back of the telescope. You will likely need to re-balance your 120APO on its mount, especially after adding a camera and other accessories, to ensure accurate tracking.

  • Optical Design Triplet (3-element)
    Magnification 1x
    Compatible Telescope Askar 120APO
    Focal Length (with 120APO) 840mm
    Focal Ratio (with 120APO) f/7
    Back Focus 55mm (from M48 thread base)
    Camera-Side Threads M54x0.75 & M48x0.75 (via adapter)
    Filter Threads M48x0.75 (2-inch) inside M48 adapter
    Weight 0.75 kg
  • Askar 1-Year Warranty