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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.