Patent ID: 6970286

Claim:
A reflective telescope comprising: a first entrance pupil; a second entrance pupil; a primary mirror for receiving and reflecting a first optical beam and a second optical beam that respectively passed through said first entrance pupil and said second entrance pupil; a secondary mirror for receiving and reflecting the first and second optical beams reflected from said primary mirror; a tertiary mirror for receiving and reflecting the first and second optical beams reflected from said secondary mirror; an exit pupil; a quaternary mirror for receiving the first and second optical beams reflected from said tertiary mirror and for reflecting the first and second optical beams to said exit pupil; and a fold mirror capable of being moved into a position where a third optical beam and a fourth optical beam are reflected directly to said exit pupil instead of being reflected by said primary mirror, said secondary mirror, said tertiary mirror and said quaternary mirror to said exit pupil.