Askar

Used Askar FRA230 - 50mm f/5.5 Triplet APO w/Quadruplet f/4.6 full frame super reducer

SKU: U2507-GM-ASK-FMA230


  • Sale
  • $350.00
  • Regular price $695.00

Qualifies for Free Ground Economy Shipping (CONUS Only)

Not Returnable Please note that used items are not returnable.

Condition: This Askar FRA Triplet/Quadruplet APO astrograph is in excellent condition.  The optics are clean; the body does a couple of dings and scratches on it (see the photos), but these minor cosmetic blemishes will not, of course, affect its operation.  

It comes in its original box, with the accessories shown in the photos.   

   

    

Description

The Askar FMA230 astrograph refractor is designed to take your observing and imaging experience to the next level.

With a compound lens system featuring two ED elements, the FMA230 offers exceptional image quality with minimal chromatic aberrations.

The four-element reducer provides a 230mm focal length and a fast f/4.6 focal ratio, perfect for sophisticated astrophotography.

Description

Askar 50mm f/4.6 Triplet Air Spaced APO Refractor Optical Tube Assembly

The FMA230 OTA also comes with standard accessories, including precision crafted tube rings, a Vixen-style dovetail plate, and a convenient handle for carrying and attaching accessories. This lightweight and compact astrograph can function as a lens or telescope, and is compatible with both full-frame ordinary and astronomy cameras. Upgrade your astrophotography with the FMA230 astrograph.

Askar FMA230 Features:

  • Compound lens system with 3-element front objective lens and 4-element posterior reducer

  • Objective lens with 50mm aperture and focal ratio of f/5.5

  • 2 ED glasses to cure chromatic aberrations

  • Four-element reducer (0.84x)

  • Tube rings included

  • Vixen-style dovetail plate

  • Utility handle for easy carrying and integration of accessories

FMA230 Optical Tube

The Askar FMA230 astrograph Optical Tube was created to expand the choices.  With its advanced features, the FMA230 is a stand out choice in the market. The front of the OTA is made up of three lenses and the posterior reducer consists of four lenses, resulting in a "three at the front and four at the rear" system. The objective lens has a 50mm aperture size and a 275mm focal length, giving a fast f/5.5 focal ratio. With two ED glasses, the objective lens can correct chromatic aberrations effectively. The compound lens system is unparalleled in terms of size and craftsmanship. By adjusting the helical focuser, you can achieve the perfect focus without the need for additional optical devices.

Askar Lenses

The four-element reducer is an essential addition to the FMA230 for astrophotography enthusiasts. It can convert the FMA230 into a 50mm aperture astrograph with a 230mm focal length and a faster f/4.6 focal ratio. Designed with a special emphasis on improving image quality across the entire field of view, it particularly focuses on enhancing the image quality of stars at the edge of the image. The dedicated reducer significantly enhances the details and quality of the photos taken with a professional full-frame ordinary or astronomy camera.

FMA230 Accessories

The FMA230 comes equipped with standard accessories. The tube rings have been artistically designed with stalks that are lengthened, providing ample room for devices like cameras without colliding with the dovetail plate. For easy mounting onto an equatorial mount, the FMA230 comes with a Vixen-style dovetail plate. The plate has a central slot for attachment to a tripod, which is convenient and helpful for ground imaging and observation. 

For astrophotography, a detachable handle has been added to the OTA that can also be used as a base for attaching finders, guiders, or ASIAIRs. The handle contains 45° Arca-swiss style slots, allowing for easy attachment to a Arca-swiss clamp on a camera tripod.

 

Specifications
Brand Askar
Free Shipping Free Shipping Available
Aperture 50mm
Backfocus Distance 55mm
Case Included No
Focal Length 275mm (230 with reducer)
Focal Ratio 5.5 (4.6 with reducer)
Focus Type Helical
Focal Length of Eyepiece 1 None included
Finderscope Included No
Diagonal Included No
Included Dovetail Vixen
Optical Tube Material Aluminum
Optical Coatings Fully Multi-Coated
Optical Tube Length 236mm
Optical Tube Diameter 68mm
Optical Tube Weight 1.2 kg (2.7 lbs)
In The Box
  • Askar FMA230 Guide Scope Lens
  • Tube Rings
  • Vixen-style Dovetail Plate
  • 2" Adapter
  • Handle
  • Information Sheet

 

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