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NOTCam Pupil Masks

The NOTCam stop/pupil mask wheel can carry up to 16 masks. We have the following such masks in hand:

  • Five annular ring discs in small masks from 13mm to 17mm diameter in 1mm increments.

  • Four additionally made small masks: 5mm, 6mm, 7mm and 9mm diameter intended for very bright objects to diminish the telescope aperture.

    Preliminary calibration shows that:
    • 5 mm stop gives about 10% transmission
    • 6 mm stop gives about 15% transmission
    • 7 mm stop gives about 22% transmission
    • 9 mm stop gives about 38% transmission

  • Four Hartmann masks: Up, Down, Left, Right