RiFAst 700

RiFAst 700

Diffraction-limited over a wide and flat field, the RiFast design will push any camera to its limits... and will do it FAST! The extraordinary f/ ratio allows a higher productivity per night, a significant factor for surveys, SN search, asteroid control, and many other fields of modern astronomy.

The central obstruction is about 50%, but still smaller than similar designs, that simply can't compete under any point of view. The visual contrast is very good, thanks also to the special ultra-dark paints we use.

The corrector group is very close to the focal plane, so chromatic aberration is undetectable.

  • Optical set: Officina Stellare proprietary optical scheme
  • Primary mirror diameter: 700 mm
  •  Focal ratio: F/3.8
  • Focal length: from 2660 mm
  • Linear obstruction: 55%
  • Full corrected and illuminated field: 80mm
  • Weight:  140Kg
  • Back focus length from back plate: about 240mm (9.5”)
  • RMS polychromatic (410 to 750 nm) spot size: 7.2 micron @ 26 mm off axis
  • RMS polychromatic (410 to 750 nm) spot size: 8.4 micron @ 40 mm off axis