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Use the iris to set the field diameter.

Format: IRIS <diameter>

Units: mm

Range: 0 < <diameter> < 150

Defaults: None

Examples : IRIS 100

Comments: The iris is used as a field stop. The iris diameter should be set to match the field of view of the detector, in order to reduce scattered light and the danger of ghost images. At a plate scale of 4.51 arcsec/mm, a field of view of 1 arcmin implies an iris diameter of 13.3 mm.

Thu Apr 7 00:29:52 BST 1994