From: "CSC" 
To: "Atm" 
Reply-To: "CSC" 


As I haven't built a refractor, my inquiry and thinking is purely prep work
for upcoming projects.  Regarding testing, I have setup some refractor
objectives (a 6" askania triplet notably) in autocollimation and used
Foucault methods.  I did not reduce these results other than to see that it
was well corrected for 3 general wavelengths.   Not Apo, but better than a
fraunhofer doublet by far.

>With some cut-n-paste, I was able to get this into OSLO.  A question:
At 565 nm, the P-V wavefront error at mid-field is better than lambda/40. 
Would you use this information to test the final result or would you find
the predicted result at another wavelength and test against that?

        Rick S.<

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