I set out to see how my 16mm Nagler type 2 would fair against modern eyepieces.
The scope an f10 classic two lens refractor
The eye pieces are listed in the title above
The sky was average, and got worse to really bad quickly.
The test subject : M13 in Hercules
first up was the 18mm ES , Dark back ground , sharp stars out to the edge minus like 4 or 5 percent. Very nice presentation. Of course slightly less magnification, but I was really just comparing views.
Next up was the new to me 16mm Nagler t2 , tack sharp stars out toe edge, I could not see any defects at the edge. focuses way farther out than either of the other 2
And last but not least....the real surprise....the 15mm knightowl…..stars were sharp to very near the edge, background was a shade or so lighter than the Naglers view. I was surprised to say the least. Of course it was an f10 scope , it focused the furthest inward., this 15mm is the odd ball of the group., all the rest are straight cylindrical affairs, the 15mm is not. Id love to know what this is. http://www.owlastron...m/ultrawide.htm
the sky was average at best and deteriorating quikly, so these results are not what I had hoped for. Ill try again if and when I get good skies