  Wide-Field Corrector designs are presented for the Blanco and Mayall
telescopes, the CFHT and the AAT. The designs are Terezibh-style, with 5 or 6
lenses, and modest negative optical power. They have 2.2-3 degree fields of
view, with curved and telecentric focal surfaces suitable for fiber
spectroscopy. Some variants also allow wide-field imaging, by changing the last
WFC element. Apart from the adaptation of the Terebizh design for spectroscopy,
the key feature is a new concept for a 'Compensating Lateral Atmospheric
Dispersion Corrector', with two of the lenses being movable laterally by small
amounts. This provides excellent atmospheric dispersion correction, without any
additional surfaces or absorption. A novel and simple mechanism for providing
the required lens motions is proposed, which requires just 3 linear actuators
for each of the two moving lenses.
