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4.3 Formats & Fields of View

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

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