If the Pfund is intended to provide fully illuminated field coverage at a 90�Flat angle, then the minimum flat diameter must be at least \ sqrt 2 = 1.4142 times the paraboloid diameter.
2.
The McDonald Observatory Supernova Search Telescope ( SNST ) used the Pfund configuration, and its feed flat diameter was 24 ", while the focusing mirror was an 18 " f / 4.5 paraboloid.
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