MMTO F/9 Top Box

F/9 Top Box Drawings

• MMT Beam Configuration (GIF image, Postscript file)
• Exploded View of Top Box
• Television Guider Feed
• Comparison Lamp Feed

F/9 Top Box Optical Parameters

• Distance from bottom of Top Box to MMT focal plane: 9.0 inches
• Image scale at TV guider (assuming 15 mm detector format):
  • Canon 85 mm: 19.4 arcsec/mm; 5 arcmin field.
  • Canon 200 mm: 8.4 arcsec/mm; 2 arcmin field.
  • Photometrics ATC-5 camera:
• Comparison sources:
  • Fe-Ne (hollow cathode)
  • Th-Ar (hollow cathode - Echelle spectrograph only)
  • Cu-He-Ar (hollow cathode)
  • He-Ar (AC glow discharge)
  • Neon (low pressure discharge)
  • Hg-Cd - attenuated longward of 4000 Å with a U-330 filter.
  • Incandescent (`Bright' and `Dim')
  • `Dome' Incandescent lamps
  • Etalon - several spacings are available.
  Click here for comparison source maps.
• Filter Wheels: Two filter wheels are mounted in front of the comparison lamp feed. One of them contains neutral density filters; the other, Hartmann masks. Note that they do not occult the beam from celestial sources.