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Ditto all of the above re Stratus, for a couple of hundred $ a Stratus 13mm is a value EP. There is a little distortion in the outer edge FOV, though it has a lot of elements they give a nice flat view not much curvature, but i am no expert at judging that. They are a little down on light transmission compared to say, a simple narrow field super plossl, but contrast is very good as far as my own eyes can detect.
For a little more the Baader Hyperion 13mm- another Vixen clone- comes with slightly better (?) coatings and threads to attach stuff to it for imaging, but i dont know much about how they work.
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