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Mirko then I guess you haven’t tried a premium Erfle in a newtonian !
A few decades ago Erfles were the must-have ultra widefield eyepieces (typically 70 degrees) but they really were only suited to small refractors - they were absolutely horrid things in Newtonians and earned the moniker “Awfle” for good reason. And a curved field was the main culprit - very curved.
Erfle derivatives often branded as “SWA” are still manufactured and are just as awful in newtonians.
Last edited by Wavytone; 17-04-2019 at 01:39 PM.
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