Abstract: The optical design of a dual path imaging spectrometer and peak up camera for the IRS instrument on the SIRTF mission is discussed. The dual path configuration allows for a single area array to be simultaneously used for both low resolution spectroscopy and high resolution imagery without overlapping. This is accomplished by the use of off-axis reflective Schmidt cameras in each optical path. These cameras provide a high resolution image and a low resolution spectral image that reside side-by-side on the focal plane without residing side-by-side in the object field. !1
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