Quote:
Originally Posted by Wavytone
Bill how does the modified Erfle compare with traditional Erfles and modern variants such as SWA, all of which have strongly curved focal planes ?
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I did just get an opportunity to compare the Burgess Modified Erfle against an ES/Bresser 70 degree Series 25mm. Centering the eyepiece on a prominent star in M45, the off-axis stars were moderately tighter in the Burgess at the same off-axis TFOV points. Maybe appearing 20%-30% tighter -- not much but noticeable. Contrast, brightness, and other common attributes seemed on-par.