$/1c= Y@ F-tanθ畸变最大显示89度,刚查了手册 60=m 原文如下: ,5Pl\keY Note that this reference is meaningless for optical {+<P:jbz; systems that use field angles at or greater than 90 degrees. If a system with field angles over 89 degrees is Si9Z>MR analyzed with this feature, the maximum computed field angle will be limited to 89 degrees