Quote:
Originally Posted by RickS
I don't see the value of a single, on-axis Strehl ratio, especially for us AP types. Without a graph showing how the ratio varies over the image circle it doesn't really tell you much. There are plenty of scope designs that have a theoretical, on-axis Strehl ratio that's right up there, but you don't have to go far off axis before it falls away rapidly. I'd like Ray-Fan plots, thanks 
Cheers,
Rick. |
Rick, for many of the scopes, Wolfgang does off axis tests, as well as testing with reducers, flatteners etc. I mentioned this in one of my deleted posts