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An optical device includes an objective, an eyepiece and a power corrector, each of which includes one or more lenses, and each of which has a respective focal length. The input focal length of the device is defined jointly by the focal lengths of the objective and the power corrector. The magnifica

An optical device includes an objective, an eyepiece and a power corrector, each of which includes one or more lenses, and each of which has a respective focal length. The input focal length of the device is defined jointly by the focal lengths of the objective and the power corrector. The magnification of the device is the ratio of the input focal length to the eyepiece focal length. The combined aberration of the eyepiece and the power corrector is less than the characteristic aberration of the eyepiece. The objective, the eyepiece and the power corrector together define an apparent field of view of at least 75 degrees and an exit pupil. The eyepiece lens diameter(s) is/are no greater than twelve times the pupil diameter and three times the eyepiece focal length.

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1. An optical device, having an optical axis and comprising: an objective having a first focal length, which is positive, and comprising a first group of one or more first lenses;an eyepiece having a second focal length, which is positive, and comprising a second group of one or more second lenses h

1. An optical device, having an optical axis and comprising: an objective having a first focal length, which is positive, and comprising a first group of one or more first lenses;an eyepiece having a second focal length, which is positive, and comprising a second group of one or more second lenses having a characteristic aberration;a power corrector having a third focal length and comprising a third group of one or more third lenses located on the optical axis between the objective and the eyepiece;the optical device having an input focal length defined jointly by the first and third focal lengths;the optical device having a magnification equal to a ratio of said input focal length to said second focal length;the eyepiece and the power corrector together having a combined aberration less than the characteristic aberration of the eyepiece; andthe eye relief being at least 12 mm. 2. The optical device according to claim 1, wherein the combined aberration comprises a combined distortion that is no greater than 5.1% over an entire field of view of the optical device and is less than a characteristic distortion of the eyepiece. 3. The optical device according to claim 1, wherein the combined aberration yields a spatial resolution at an exit pupil of the optical device that is finer than 2 arcmin on the optical axis and finer than 6 arcmin at an edge of the exit pupil. 4. The optical device according to claim 1, wherein the power corrector has a positive optical power. 5. The optical device according to claim 4, wherein the objective and the eyepiece have respective positive optical powers. 6. The optical device according to claim 5, wherein the third focal length is less than the second focal length. 7. An optical device having an optical axis and comprising an objective having a first focal length, which is positive, and comprising a first group of one or more first lenses;an eyepiece having a second focal length, which is positive, and comprising a second group of one or more second lenses having a characteristic aberration; a power corrector having a third focal length and comprising a third group of one or more third lenses located on the optical axis between the objective and the eyepiece;the optical device having an input focal length defined jointly by the first and third focal lengths;the optical device having a magnification equal to a ratio of said input focal length to said second focal length;the eyepiece and the power corrector together having a combined aberration less than the characteristic aberration of the eyepiece; andthe power corrector has a negative optical power. 8. The optical device according to claim 1, and comprising an image erector, which comprises at least first and second reflective surfaces, wherein the power corrector comprises at least one lens that is located on the optical axis between the first and second reflective surfaces. 9. The optical device according to claim 8, wherein the first and second reflective surfaces comprise mirrors. 10. The optical device according to claim 1, and comprising an aperture stop located between the objective and the eyepiece. 11. The optical device according to claim 1, wherein the first lenses are arranged in a telephoto structure. 12. The optical device according to claim 1, wherein at least one of a set of lenses consisting of the first lenses, the second lenses and the third lenses is movable so as to zoom the magnification of the optical device. 13. The optical device according to claim 12, wherein the magnification is zoomed by varying a spacing between the third lenses in the power corrector. 14. The optical device according to claim 1, wherein the objective, eyepiece and power corrector together define an apparent field of view of at least 75°. 15. The optical device according to claim 14, wherein the objective, eyepiece and power corrector together define an exit pupil of a given pupil diameter, wherein the second lenses all have respective lens diameters that are no greater than twelve times the pupil diameter, wherein the eyepiece has an eye relief defined by a location of the exit pupil, and wherein the respective lens diameters of the second lenses are all no greater than four times the eye relief. 16. The optical device according to claim 14, wherein the second lenses all have respective lens diameters that are no greater than three times the second focal length. 17. The optical device according to claim 1 wherein an exit pupil diameter is greater than about 4 millimeters and an apparent field of view is greater than about 85 degrees, wherein no optical component of said eyepiece has a dimension transverse to an optical path of the optical system that is greater than about 50 millimeters. 18. The optical device according to claim 14, wherein the apparent field of view of the optical device is at least 85°. 19. An optical device according to claim 1, wherein each one of said objective, eyepiece and power corrector has a respective pre-defined focal length. 20. The optical device according to claims 15 wherein an exit pupil diameter greater than about 4 millimeters, wherein no optical component of said eyepiece has a dimension transverse to an optical path of the optical system that is greater than about 50 millimeters. 21. The optical device according to claims 18 wherein an exit pupil diameter is greater than about 4 millimeters, wherein no optical component of said eyepiece has a dimension transverse to an optical path of the optical system that is greater than about 50 millimeters. 22. A microscope having optical axis and comprising: an objective having a first focal length, which is positive, and comprising a first group of one or more first lenses;an eyepiece having a second focal length, which is positive, and comprising a second group of one or more second lenses having a characteristic aberration a rower corrector having a third focal length and comprising a third group of one or more third lenses located on the optical axis between the objective and the eyepiece;the microscope having an input focal length defined jointly by the first and third focal lengths;the microscope having magnification equal to a ratio of said input focal length to said second focal length; andthe eyepiece and the power corrector together having a combined aberration less than the characteristic aberration of the eyepiece.