STScI Logo

4.3 Formats & Fields of View

[Top] [Prev] [Next]


The FOC f/96 camera has a maximum field of view of 14 x 14 arcseconds square, obtained with the 512 x 1024 zoomed format, although the dynamic range of this format is limited. The FOC can operate with normal pixels (square, 25 x 25 microns) or zoomed pixels (rectangular, 50 x 25 microns). Normal pixels provide a plate scale of 0.01435 arcsec pixel-1 for the f/96 camera, and 0.02870 arcsec pixel-1 for the f/48 camera. Zoomed pixels are twice as long in the x direction. All formats larger than 512 x 512 pixels automatically have an 8-bit word length. Table 4.2 and Table 4.3 provide the main characteristics of the standard formats for the f/96 and f/48 camera respectively, where the first column gives the format size (S x L), the second the pixel size in microns, the third the starting point in pixels, the fourth the word length, the fifth the zoom configuration, and the sixth the overall field of view in arcseconds squared for that format.

Available f/96 Formats
Format (S x L) Pixel Size (µm2) (arcsec2) Offset (S0,Lo) Word Length Zoom FOV (arcsec2)
512 x 1024

50 x 25

(0.029 x 0.014)

0,0

8 bit

on

14 x 14

512 x 1024

25 x 25

(0.014 ¥ 0.014)

256,0

" "

off

7 x 14

512 x 512

50 x 25

(0.029 x 0.014)

0,256

16 bit

on

14 x 7

512 x 512

25 x 25

(0.014 x 0.014)

256,256

" "

off

7 x 7

256 x 256

" "

384,384

" "

" "

3.6 x 3.6

128 x 128

" "

448,448

" "

" "

1.8 x 1.8


Available f/48 Formats
Format (S x L) Pixel Size (µm2) Offset (S0,Lo) Word Length Zoom FOV
512 x 1024 (imaging)

50 x 25

(0.057" x 0.029")

0,0

8 bit

on

28" x 28"

512 x 1024 (spec)

50 x 25

(0.057" x 1.7Å)

0,0

8 bit

on

28" x 1700Å

512 x 1024 (spec)

25 x 25

(0.029" x 1.7Å)

192,0

8 bit

off

14" x 1700Å

256 x 1024 (spec)

25 x 25

(0.029" x 1.7Å)

320,0

16 bit

off

7" x 1700Å


[Top] [Prev] [Next]


Copyright © 1997, Association of Universities for Research in Astronomy. All rights reserved.

Last updated: 11/13/97 16:36:34