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Optical designs are presented for the Maunakea Spectroscopic Explorer (MSE)telescope. The adopted baseline design is a prime focus telescope with asegmented primary of 11.25m aperture, with speed f/1.93 and 1.52degfield-of-view, optimized for wavelengths 360-1800nm. The Wide-Field Corrector(WFC) has five aspheric lenses, mostly of fused silica, with largest element1.33m diameter and total glass mass 788kg. The Atmospheric Dispersion Corrector(ADC) is of the compensating lateral type, combining a motion of the entire WFCvia the hexapod, with a restoring motion for a single lens. There is a modestamount of vignetting (average 5% over the hexagonal field); this greatlyimproves image quality, and allows the design to be effectively pupil-centric.The polychromatic image quality is d80<0.225"/0.445" at ZD 0/60deg over morethan 95% of the hexagonal field-of-view. The ADC action allows adjustment ofthe plate-scale with zenith distance, which is used to halve the image motionscaused by differential refraction. A simple design is presented for achievingthe required ADC lens shifts and tilts. A two-mirror design was also undertakenfor MSE, but was not selected. This is a 12.3m F/2.69 forward Cassegraindesign, with a 2.75m diameter M2, and three silica lenses, of largest diameter1.33m. The field-of-view is again 1.52deg. The f/0.95 primary makes the designremarkably compact, being under 10m long. The ADC action involves a smallmotion of M2 (again via a hexapod), and shifts and tilts of a single lens. Thedesign is effectively pupil-centric, with modest vignetting (5.9% average). Theimage quality is virtually identical to the prime focus design.

Optical designs for the Maunakea Spectroscopic Explorer Telescope