Brand: SharpStar

Askar FRA 600 Quintuplet APO Astrograph (FRA600)

FRA600

Brand: SharpStar

Askar FRA 600 Quintuplet APO Astrograph (FRA600)

FRA600

Sometimes there's no substitute for extra aperture. This 108mm refractor can gather a lot of light and will bring out extraordinary detail in the faintest deep sky objects. This is a great astrograph for any astrophotographer.
  • 108mm aperture
  • 600mm focal length
  • Quintuplet air-spaced APO design
  • Full frame camera support
  • No need for flattener
  • 0.7x Reducer (optional)
  • No need to calculate backfocus length
  • Retractable lens hood
  • Multi-Functional handle
  • 4.2" large rack-pinion focuser
  • 1:10 fine adjustment
  • Various adapters
$2,550.00 USD

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$2,550.00 USD

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Why we love the Askar FRA 600 Quintuplet APO Astrograph (FRA600)

Sometimes there's no substitute for extra aperture. This 108mm refractor can gather a lot of light and will bring out extraordinary detail in the faintest deep sky objects. This is a great astrograph for any astrophotographer.

The Askar FRA (Flatfield Refractive Astrograph) series are a modernized petzval design. They offer sharp and flat-to-the edge views with massive imaging circles. Askar uses two ED elements in the main objective to ensure images that are completely free of chromatic aberration.

What you get are expansive views with pinpoint sharp stars and color accurate images. These modern quintuplets leverage cutting edge camera technology to deliver stunning astrophotography results.

Product Description

Following the excellent optical performance of its first FRA400/5.6, the FRA600/5.6 is an evolution of the FRA series. An upgraded lens has a 108mm aperture and a 600mm focal length, the f/ratio is still f/5.6, and the image circle is 66mm surpass the full frame!

This FRA600 Quintuplet Refractor is built on a Petzval design, comprising a front triplet and rear doublet lenses, two pieces of which are ED glass. This combination provides a high level of apochromatic performance for astroimaging.

With wonderful optical design, the FRA600 astrograph provides a 66mm image circle to ensure excellent star shape across the entire field whilst controlling chromatic aberration, minimizing the distortion. The two lenses in the rear group have a diameter of 80mm, effectively counterbalancing the effect of decreasing field illumination. With the precise manufacturing, they obtain optimal sharpness nearly to the theoretical level, bringing you beautiful clear detailed images with round-shape stars.

The FRA600 comes with a large 4.2" rack-and-gear-based focuser which includes a standard 1:10 focal adjustment knob, the focuser greatly enhances the payload to a pro level, offering smooth operation without slipping when heavy imaging equipment and accessories are attached. The focuser allows multiple connections. Besides, Askar also offers a standard conical extender with threads of M54×0.75 and M48×0.85 to connect various astrophotographic equipment.

Mechanically, the FRA600 has a tube diameter of 120mm and a retractable dew-shield. With the dew-shield retracted, the total length is only 493mm, making it a great portable 4" astrograph.

A set of multifunctional red anodized tube rings includes mounting points on three sides, making itself easy for attachment of accessories such as guider scope for backyard viewing.

In addition to supporting wide field astrophotography, the FRA600 is also perfect for high quality observation, providing exquisite chromatic aberration correction and creating images with impressive contrast comparable to visual experience.

The excellent performance would already justify its price if the FRA600 was a mere triplet APO refractor. But our FRA600 is a 4.3" Super APO Quintuplet Astrograph, its ingenuity has already exceeded its counterparts falling in the same price range.

What can I see with a Askar FRA 600 Quintuplet APO Astrograph (FRA600)?

Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.

Jupiter with

25mm Eyepiece - 24x Magnification

(Sold Separately)

Jupiter with

10mm Eyepiece - 60x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 120x Magnification

Sold Separately

Moon with 25mm Eyepiece

24x Magnification

(Sold Separately)

Moon with 10mm Eyepiece

60x Magnification

Sold Separately

Moon with 5mm Eyepiece

120x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

17x Magnification

Sold Separately

Andromeda with 25mm Eyepiece

24x Magnification

(Sold Separately)

Andromeda with 10mm Eyepiece

60x Magnification

Sold Separately

What's in the Box

  • Optical Tube
  • Pair of tube rings
  • Handle
  • Dovetail plate
  • Sectional Conical tube adapter (with M54x0.75 and M48x0.75 male thread)
  • Inspection list
  • Manual

Specifications

Aperture 108mm
Focal Length 600mm
Focal Ratio F/5.6
Objective Type Quintuplet flat-field APO (Including two ED elements)
Image Circle 66mm
Back Focus 160mm (from the end of the rotator M90x1 thread)
Overall Length 493mm
Tube Weight 6.5kg
Standard Packing Weight 7.8kg
Back-End Adpdater
  • M108x1 male thread (no rotator)
  • M90x1 male thread
  • 2" adapter/1.25" adapter
Conical Adapter
  • M90x1 to M54x0.75
  • M54x0.75 to M48x0.75

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