Primary mirror diameter
|
250 mm
|
Primary focal ratio
|
F/3
|
Secondary mirror diameter
|
102 mm
|
Equivalent focal ratio
|
F/8
|
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
|
Price
|
2200 EURO
|
