Wide-Field Corrector designs are presented for the Blanco and Mayalltelescopes, the CFHT and the AAT. The designs are Terezibh-style, with 5 or 6lenses, and modest negative optical power. They have 2.2-3 degree fields ofview, with curved and telecentric focal surfaces suitable for fiberspectroscopy. Some variants also allow wide-field imaging, by changing the lastWFC element. Apart from the adaptation of the Terebizh design for spectroscopy,the key feature is a new concept for a 'Compensating Lateral AtmosphericDispersion Corrector', with two of the lenses being movable laterally by smallamounts. This provides excellent atmospheric dispersion correction, without anyadditional surfaces or absorption. A novel and simple mechanism for providingthe required lens motions is proposed, which requires just 3 linear actuatorsfor each of the two moving lenses.
展开▼
