This discussion is based on the FuSi doublet corrector design by Paul Byard ( e-mail: byard@astronomy.ohio-state.edu) of the Imaging Science Lab at Ohio State U. The naked plate scale of the 2.4-meter telescope is virtually unmodified by the corrector at 86.4 micron/arcsec. Since the pixels are 15 micron on a side, that's 0.174 arcsec/pixel. There is some image distortion (0.7% at field radii of 18 arcmin). The entire field of view is 24.0 arcmin on a side.

IMAGING QUALITY

For the Byard design, r.m.s. image diameters have been computed for U, B, V, R and I.

Imaging Performance of Byard Corrector:

Field Angle	R.M.S. Diam. (U)	R.M.S. Diam. (B)	R.M.S. Diam. (V)	R.M.S. Diam. (R)	R.M.S. Diam. (I)
(arcmin)	(arcsec)	(arcsec)	(arcsec)	(arcsec)	(arcsec)
0	0.19	0.20	0.09	0.09	0.06
6	0.20	0.21	0.09	0.10	0.06
12	0.23	0.24	0.12	0.12	0.07
18	0.28	0.27	0.13	0.13	0.08