The tree-lens field flattener is the real masterpiece of this telescope. Primary mirror is asperical, secondary mirror is spherical.
- ENTRY PUPIL DIAMETER:
- 600 mm (24'')
- FOCAL RATIO:
- FOCAL LENGTH:
- 2280 mm (90'')
- LINEAR OBSTRUCTION:
- FULLY CORRECTED AND ILLUMINATED FIELD:
- 80 mm
- 105 Kg
- BACK FOCUS EXTRACTION:
- about 240 mm (9.5'')
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.