Re: [APML] RC Field Flattener

[Aplanatic@aol.com]

Gil:

I have optimized a FF design for the RC Cass given in my last post.  It uses garden variety BK7 and F2 glasses.  The results are rather nice.

The BFL is about 4", which should be plenty for most applications.  The RMS spot diameter 1.7" off-axis is 35 microns (it cancels some of the residual astigmatism in the RC).  With the FF the scope has a focal ratio of f/10.

When you get the exact optical design of the RC I'll re-optimize the FF for your desired BFL and send it to you.

Dave Rowe



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