The set of optics for
Ritchey-Chretien telescope RC250

Primary mirror diameter

250 mm

Primary focal ratio


Secondary mirror diameter

102 mm

Equivalent focal ratio


Equivalent focal length

2000 mm

Back Focus (from primary mirror surface)

291 mm

Primary to Secondary Spacing

466 mm

Primary mirror hole

90 mm

Primary mirror thickness

30 mm

Secondary mirror thickness

15 mm

Mirrors material

LK-7 (low expansion optical glass) Optionally optics from AstroSitall may be maintained

Optical accuracy

1/4 wave peak-to-valley of wave front in assembled system or better and 1/25 wave RMS or better, Strehl Ratio is 0.95 or is higher.
The interferometric test report is supplied with each optical sets

Coating of surfaces

Al + SiO2 (Quartz) overcoat


2200 EURO

Copyright © 2007