Hi Kelvin,

There are some restrictions on the types and properties of sequential surfaces that will be automatically converted to non-sequential objects. First off, in systems with multiple configurations, operands like YFIE, XFIE, APMN, APMX, CBDX, CBDY are not supported. All unconverted operands will be replaced by a MOFF operand and a brief description of the unconverted operand will automatically be inserted. Sources and Detectors will be positioned with several NPOS and NPAR to place the Source Ellipse for each field and the Detector Rectangle for each image location. However, sometimes you may need to adjust the values to place the sources in the proper positions.

Please note that for ZBD files including multiple configurations, OpticsBuilder can load one configuration at a time. So, converting multiple configurations to NSC one by one may be of more convenience in this case.

I hope this help.

Best regards,

Moj