Large Format Camera (LFC) Technical Specifications
Field diagram and chip orientation
Mosaic of six 2048 × 4096 pixel SITe SI-002 thinned, backside illuminated,
AR coated CCD located at Hale Telescope's prime focus (
f/3.3) Field diameter: 24′
Pixel size: 15 µm
0.18″/pixel binned 1×1
0.36″/pixel binned 2×2
Minimum exposure time: 0.6 sec
Gap between CCD chips: ~ 15″
Readout (mosaic) options:
Image file size: ~ 17 Mb per CCD at 1 × 1 binning
LFC guider: partially vignetted 512 × 512 SITe chip located in the open
area between chips 3 and 5. See focal plane schematic.
Capable of guiding down to
mV ~ 18
The six LFC CCDs are SITe SI-002 chips, 2048 wide by 4096 pixels tall.
Each pixel is 15 microns square, which corresponds to ~ 0.18″/pixel
(0.175″/pixel at the center of the mosaic; 0.185″/pixel at the field edge).
Filter wheel has slots for 4 filters.
also this page.
6.1 inches square
Thickness: ~3 mm (min); 10 mm
(max), but < 6 mm preferred due to weight considerations.
Palomar support team
about non-observatory filter mounting. Also see
Rob Simcoe's LFC Page for more information.
MCDCOM program update (February 20, 2007)
Added logic to filter wheel movement so that the filter wheel will correctly move to the
requested position in both extreme cold and extreme hot ambient temperatures.
Created two new backup
MCDCOM programs in case the hot/cold logic fails:
mcdcom_hot to be used in hot temperatures
mcdcom_cold to be used in cold temperatures
mcdcom is started, 3 scripts are automatically copied to the user's working directory
(if none exist):
A test version of the lfcguider (
lfcguide_ns) is now available which attempts
to guide at non-sidereal rates. Target rates are entered in the
menu popup window.
MCDCOM program update (April 28, 2005)
iraf command now works. When toggled ON, files are written
as signed integer FITS.
istat command now works correctly, displaying the mean of
A new command
fs has been added. This adds a filename suffix
.fits). To clear this at
any time, issue
New commands have been added to turn lamps on and off from the command line,
useful in domeflat scripts:
header bug in the guider program. All fits files should now have proper telescope header
information, regardless of when a go is issued.
Added narrow band filters (Nov. 2007)
Karl Stapelfeldt has supplied two new narrow band filters from Asahi Spectra.
The filter plots are linked above, and are named H-alpha and S-II.
More narrow band filters (2008 & 2009)
Ted Wyder and Brian Siana have added the following filters which are listed and
linked above: 6610/100,6650/100,6700/100,3800/200. All are available to the public.