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Figures (2)

Fig. 1
Fig. 1

Optical configuration for the four-mirror Nasmyth focal reducer to convert the Nasmyth f/13.5 focus into an f/3.0 focus to permit scale and optical speeds typical of the prime focus. The field of view is 8 min of arc.

Fig. 2
Fig. 2

Spot diagrams for the f/3 reducing camera at several field angles and wavelengths. The slight color aberration arises from the field lens. No plane–parallel window ahead of the focal surface is included in these diagrams.

Tables (2)

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Table I Four-Mirror Reducing Camera Design Data

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Table II Four-Mirror Reducing Camera Image Data

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