Table 8.

Derived MTF values at Nyquist frequency as a function of filter and zoom at the center and edge of the field of view. Values are derived from autofocused or best-focus images of the MTF “lensgrid” target acquired during geometric calibration. The target was at a distance of 2.55 m, 4.68 m, and 7.68 m for the 34 mm, 63 mm, and 100 mm zoom positions, respectively. See Sect. 3.8 for more details

Filter number	Effective center wavelength (nm)	34 mm centera–edgeb	63 mm center–edge	100 mm center–edge
L0	530	0.45–0.47	0.45–0.42	0.41–0.41d
L1	800	0.40–0.41	0.39–0.39	0.38–0.37
L2	754	0.32–0.35	0.43–0.42	0.37–0.39
L3	677	0.45–0.45	0.43–0.41	0.40–0.44
L4	605	0.45–0.50	0.44–0.42	0.41–0.38
L5	528	0.48–0.47	0.46–0.46	0.42–0.40
L6c	442	0.43–0.45	–	0.43–0.40
R0	530	0.49–0.50	0.47–0.45	0.42–0.47
R1	800	0.42–0.44	0.39–0.40	0.40–0.35
R2	866	0.38–0.40	0.38–0.38	0.35–0.31
R3	910	0.36–0.37	0.36–0.36	0.36–0.32
R4	939	0.36–0.38	0.35–0.36	0.32–0.30
R5	978	0.33–0.36	0.35–0.34	0.30–0.28
R6	1022	0.33–0.34	0.33–0.32	0.26–0.26

^aThe center value is derived from the MTF edge closest to the pixel (824,600)

^bThe edge value is derived from the MTF edge closest to the pixel (1500,600)

^cAutofocus failed in the L6 filter for the 63 mm zoom position

^dTypical errors in derived MTF values are ∼.02-.03 and chart orientation can affect these single derived values of the MTF. We find fairly flat MTF response across the field of view (see Fig. 30) and do not find significantly increased or decreased performance in MTF across any given frame