2.5 Optical specifications
Guaranteed surface quality
λ/24 RMS wave front accuracy (>90% Strehl)
A quality certificate including an interferogram comes with the telescope.
If you want to learn more about ASA’s optics manufacturing and outstanding testing methods click here.
Focal length 5476mm
f-number 6.8
optical Diameter ≥800mm
Mirror Material Fused Silica (JGS2 Quartz), ultra-low thermal expansion 0.55e-6/°C
Image scale 37.67” per mm
2.6 Backfocus
The following figure describes the position of the optical focus for each of the nasmyth focus ports.
Figure 4 - backfocus for nasmyth ports [mm]
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