Documents  Polarimeter Quick Reference
  Spectropolarimetry. II. Circular Polarization Optics and Techniques.
  Reference Manual - For those who want some details.
Focus  Afternoon focus procedure
Please use the LRIS focus GUI
Calibrations Standards
Standards star list name Comments
Polarized /kroot/starlists/0000_polarized Includes HST standards sorted by RA (listed first) followed by standards used by previous polarimetry experts
Unpolarized /kroot/starlists/0000_unpolarized
Imaging Photometric /kroot/starlists/0000_landolt.std.big Photometric flux standards are the same for LRIS and LRISp. Photometric flux standards are listed here.
Spectrophotometric /kroot/starlists/0000spectraphoto.stds Spectrophotometric flux standards are the same for LRIS and LRISp. Spectrophotometric flux standards are listed here.

Note that with some polarizing elements (HNP'B UV/optical Polaroid and teh IR800 IR polarizer), some of the wave plate positions will put all the light into one beam. Don't let yourself be fooled into doubling your exposure times and saturating the images at those angles.
Arc Lamps Typical Exposure Times
Flats Dome Flat Typical Exposure Times