It wasn't too long ago that I read somewhere in which someone wrote 
that if it were for the efforts of Roland Christen and Al Nagler (referring to their breakthrough in APO refractors), the refractors might have gone the way of the dinosaur (i.e. extinction). I guess this was because the achromat of yesteryears were all very long in length (but prudent in focal ratio .
With so many new APOs these days, I wonder if the refractors have been making a come up, Jurassic Park style?
http://www.apogeeinc.com/
Ron B[ee]
that if it were for the efforts of Roland Christen and Al Nagler (referring to their breakthrough in APO refractors), the refractors might have gone the way of the dinosaur (i.e. extinction). I guess this was because the achromat of yesteryears were all very long in length (but prudent in focal ratio .With so many new APOs these days, I wonder if the refractors have been making a come up, Jurassic Park style
?http://www.apogeeinc.com/
Ron B[ee]
