The theory of secondary spectrum which exists in long focal-wide bands optical systems is introduced in this paper and the qualifications needed to eliminate are also analyzed.

Optical and mechanical design for long focal length and wide-field optical system;

This dissertation aims at meeting the needs of designing long focal length space camera.

Hybrid diffractive-refractive design based on binary optical elements and equiva- lent glasses have been introduced to correct secondary spectrum in long focus and large spectral bandwidth tdescope.