A condenser system for use with a ringfield camera, said condenser system comprising: a small compact source (12; 22; 86; 110) of continuous spectrum of radiation light; collector mirrors (C 1; 88) comprising at least two substantially equal radial segments (20; 30) of a parent aspheric mirror, each having one focus at the radiation source (12; 22; 86; 110) and a curved line focus filling the object field of the camera at the radius of the ringfield and each producing a beam of radiation; a corresponding number of sets of correcting mirror means (41, 51, 60; 42, 52, 60; etc.) which are capable of translation or rotation, or both, such that all of the beams of radiation pass through the entrance pupil of the camera and form a coincident arc image at the ringfield radius, wherein at least one of the correcting mirrors of each set, or a mirror that is common to said sets of mirrors, from which the radiation emanates, is a concave relay mirror that is positioned to shape a beam segment having a chord angle of about 25 to 85 degrees into a second beam segment having a chord angle of about 0 to 60 degrees; and diffractive spectral filter means (80; 90) for separating first radiation light having a wavelength of about 13.4nm from the continuous spectrum of radiation light; wherein the condenser system further comprises one or more adsorptive members (84; 96; 122) for absorbing at least a portion of radiation light of a wavelength other than that of the first radiation light; and the diffractive spectral filter means (80; 90) comprises a diffraction grating that has a blazed-phase configuration forming a discrete profile blaze-grating having more than two levels. a small compact source (12; 22; 86; 110) of continuous spectrum of radiation light; collector mirrors (C 1; 88) comprising at least two substantially equal radial segments (20; 30) of a parent aspheric mirror, each having one focus at the radiation source (12; 22; 86; 110) and a curved line focus filling the object field of the camera at the radius of the ringfield and each producing a beam of radiation; a corresponding number of sets of correcting mirror means (41, 51, 60; 42, 52, 60; etc.) which are capable of translation or rotation, or both, such that all of the beams of radiation pass through the entrance pupil of the camera and form a coincident arc image at the ringfield radius, wherein at least one of the correcting mirrors of each set, or a mirror that is common to said sets of mirrors, from which the radiation emanates, is a concave relay mirror that is positioned to shape a beam segment having a chord angle of about 25 to 85 degrees into a second beam segment having a chord angle of about 0 to 60 degrees; and diffractive spectral filter means (80; 90) for separating first radiation light having a wavelength of about 13.4nm from the continuous spectrum of radiation light; wherein the condenser system further comprises one or more adsorptive members (84; 96; 122) for absorbing at least a portion of radiation light of a wavelength other than that of the first radiation light; and the diffractive spectral filter means (80; 90) comprises a diffraction grating that has a blazed-phase configuration forming a discrete profile blaze-grating having more than two levels.