Hi @tariq_self,

Apologies on the delayed response to your question. Could you share more details about what error you are seeing or possibly a sample file? Does this occur when you are using the Zemax Element Drawing tool? In that case, check if it could be a missing Note File.

Best,
Ethan

Thank you for your response @ethan , My left surface is Binary 2 and where can I find the attachment ( See attachment) ?

Hi @tariq_self,

Thanks for the additional information. The ISO Element Drawing tool displays only one radius and one conic constant for each element. However, in your case, the surface is much more complex, so the drawing adds “See Attachment.” It does not actually generate an attachment; instead, you must write the attachment yourself with necessary equations, maps, and parameters.

I hope this is helpful.

Best,
Ethan