Re: [APML] Cassegrain notes

[Chris1011@aol.com]

In a message dated 9/19/2001 3:06:10 PM Pacific Daylight Time, genehorr@texas.net writes:


> Assuming the primary and secondary
> both have the same FLs the field curvature should be the same.*
>
> * But this is a guess on my part.  


You are correct, when primary and secondary are the same, the field is flat, but the secondary obstruction is 50% or more for a typical film format.

Roland Christen