Imaging Mode

In the long camera imaging mode, a folding flat is placed at the re-imaged telescope pupil by the disperser carousel, which folds the collimated beam back to the camera. A full description of the performance of the long camera is contained in the report by Epps (1/21/98).

In general, this camera (independently) produces images with $22.3 \pm 3.8$ microns (at 135 microns/arc-sec) averaged over all field angles and wavelengths within the 0.365-1.00 micron spectral range (without refocus). Table 1 show the RMS image diameters for five pass-bands and four field positions.

 

Table 1: Long camera image diameters (arc-sec) for 5 pass bands

Field	mod U	B band	V band	R band	I band
on axis	0.07	0.05	0.10	0.12	0.15
50%	0.11	0.05	0.10	0.10	0.14
80%	0.13	0.06	0.11	0.10	0.17
full field	0.14	0.10	0.16	0.14	0.20