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Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 1
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 2
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 3
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 4
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 5
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 6
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 7
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 8
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 1
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 2
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 3
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 4
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 5
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 6
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 7
Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA - 8

Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA

ASK_FRA500
€2,230.00
Tax included

Askar FRA500 It boasts a quintuplet air-spaced APO optical structure, a "three plus two" Petzval lens combination. The 90mm front lens group consists of three lenses (including two pieces of ED glass) for excellent correction of aberrations. The flatfield corrector is composed of two lenses with an image circle of 55mm, at a focal length of 500 mm.

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The Askar FRA500 astrograph 

From the front, the Askar FRA500 has an impressive dew shield decorated with a classic bright-red bezel ring. The total length of FRA500 is 452mm when the dew shield is stretched out and 410mm when contracted back. At the tail end of the astrograph locates a 3.5" massively-built focuser with dual-speed hand knobs (twin knobs for coarse adjustment and one 1:10 fine adjustment knob), which is of great use in real observation or astrophotography.

The focuser can be rotated.

The astrograph wears smooth coating and is evenly finished. The graduation inside of the focuser is quite clear and easily readable. The focuser is tough and solid, and on the left side of it, there is a standard finder base with a silver thumb screw. So the FRA500 can piggyback carry finders, guiders or other potential astronomy accessories also it has  a pair of sought-after tube rings. On the top of the tube rings attached a handle and at the bottom, there is an Askar Losmandy-style dovetail plate.

All is protected in a very well made flightcase,

The Askar FRA500 is 410mm long and weighs about 4kg , so it's quite convenient for users to carry around or mount on an EQ mount. It's particularly suitable for astronomy enthusiasts who frequently engage in long-distance trips or out-door astrophotography.

There is a special reducer for sale, to bring the telescope to a very fast system flatfield F 3.9.!!

The Askar FRA500 give with a unique optical design and the subsequently high-quality imaging results a loyal companion alongside your journey of astrophotography.

Specifications

  • Aperture size:90mm
  • Focal length:500mm
  • Focal ratio:f/5.6
  • Objective lens:Quintuplet air-spaced APO (including two ED glass)
  • Image circle:55mm
  • Back focus:158mm(from base of M48×0.75 thread on the conical extender to focal plane)
  • 85mm(from base of M86×1 thread on the rotator to focal plane)
  • Total length:452mm(410mm when the dew shield is contracted)
  • Net weight:4.1kg
  • Gross weight:5.2kg
  • Rear-end thread type:M86×1
  • Conical adapter:M48×0.75 in 3 parts
  • Package items:an FRA500 OTA, a pair of tube rings, a handle, an Askar Losmandy dovetail plate, a conical  a finderscope holder  a extender, a manual and a flightcase
Telescope System
Optical Tube Only (OTA)
Telescope type
Apochromatic Refractor
Astrograph
Telescope Series
FRA
Telescope Lens type
Quintuplet (5 lenses)
Telescope Aperture (mm)
90mm
Telescope Focal Length (mm)
500mm
Telescope Focal Ratio (F)
F5.6

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Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA

Askar FRA500 90mm F5.6 500mm flat field quintuplet astrograph OTA

Askar FRA500 It boasts a quintuplet air-spaced APO optical structure, a "three plus two" Petzval lens combination. The 90mm front lens group consists of three lenses (including two pieces of ED glass) for excellent correction of aberrations. The flatfield corrector is composed of two lenses with an image circle of 55mm, at a focal length of 500 mm.

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