As far as a review on the Nagler 31mm T5 , it has been review to death but we did a comparison to the Andrews 30mm 80deg on the night.
The Nagler -- one word sums it up WOW
The Andrews is a great eyepiece for slow scopes from f6 to f10 and beyond.
We compared it in the SCt scope and ít had a usable 75 deg field , with only the very outer showing flaring of the stars.
In the f6 Newtonian usable field is about 70degs.
The Nagler in all the scopes that night --- WOW you really have to move your head around to see it all and the stars are little pin points right to the edge , was the comment of the night.
So for those on a budget with a slower scope the Andrews is a goer , but for the perfectionest or fast scope wide field junky the Nagler is tops.
Is the Nagler worth over 6 times the price of the budget Andrews??? It depends on what your expectations are I suppose.
Mark
P.S. the Andrews is now up for sale .