FRA500 Quintuplet APO Astrograph
Askar
From $1,999.00
4 stores
The Askar FRA500 is a 90mm f/5.6 quintuplet APO astrograph featuring advanced color correction and crisp, high-contrast images with its innovative five-element optical design. The Petzval design ensures a flat field across a 55mm image circle while two ED elements virtually eliminate chromatic aberration, making it ideal for wide-field deep-sky imaging. Recognized for its large aperture, fast speed, delicate focusing system, and unique optical design, the FRA500 delivers high-quality imaging results in a lightweight, compact package that is particularly suitable for astronomy enthusiasts who frequently engage in long-distance trips or outdoor astrophotography.
High Point Scientific
FRA500 Quintuplet APO Refractor
Ships to US only
$1,999.00
OPT
Askar FRA500 Quintuplet APO Astrograph
Worldwide shipping
$1,999.00
Astronomy Plus
FRA500 90mm f/5.6 Quintuplet APO (FRA500)
Worldwide shipping
CA$2,799.00
~$2,045.53
Astroshop.eu
Apochromatic refractor AP 90/500 FRA500
Worldwide shipping
€2,385.00
~$2,811.67
Specifications
| Coating | multiple |
| Highest magnification | 180 |
| Optics type | Refractor |
| Optical design | Petzval |
| Aperture | 90 mm |
| Focal length | 500 mm |
| Back Focus | 158 mm |
| Focal ratio | f/5.6 |
| Focuser Type | 3.5 inch Dual-Speed Rack-and-Pinion |
| Weight (Net) | 4.1 kg |
| Tube Diameter | 105 mm |
| Number of Optical Elements | 5 |
| Weight (Gross) | 5.2 kg |
| Image Circle | 55 mm |
| ED Glass Elements | 2 |
| Length (Retracted) | 410 mm |
| Length (Extended) | 452 mm |