Open Access

Table 2

Optical parameters of AtLAST.

Parameter Value Units
Primary mirror (M1) diameter 50.0 m
Primary focal length 17.5 m
Secondary mirror (M2) diameter 12.0 m
Back focal distance 14.0 m
Tertiary mirror (M3) diameter 6 × 8.6 m
Focal surface (FS) diameter 4.7 m

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