M 31

Technical Data
  Optics

Pentax 105SDHF refractor (D=105mm, F6.7)
with and without Pentax 67 1.4x rear-converter (F9.38)
  Camera Pentax 67
  Tracking Takahashi NJP mount, 6cm/F12 guidescope, manual guiding
  Film and Exposure
F9.38 :
Fujichrome Provia 400F, +2 push, 2 hours.
Konica Centuria 400 Professional, 80 min x2, 100 min x1.

F6.7:
Konica Centuria 400 Professional, 80min x2
Konica Centuria 800 Professional, 80min x1

Additional color information (no luminance) from
F6.7: Kodak E100S, +2 push, 100 min x1

total exposure time: 12 hours
  Time 2003/1/3, 2004/7/20, 7/21, 12/11, 2006/7/24, 10/16
  Location Mauna Kea (at ~3500m and ~4100m)
Jordan Canyon, New Mexico (~2100m)
 
Note


This is a stacked image of 8 exposures.

Medium resolution image (1352k)

M31 Zoom-in (588k)