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Fig. 2

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Two optical concepts for a microlens-based pixel demagnifier. Light travels from left to right, F1 is the primary telescope focus. Top panel: focal plane (F1), sampled with microlenses. It reimages the pupil onto a pinhole. The pinhole then reimages F1 onto the grating (in F2). Bottom panel: focal plane sampled with microlenses, reimaging the pupil in P1. F1 is reimaged with a given demagnification factor in F2, while the pupil is reimaged onto the grating (in P2).

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