Definately the best approach is to try and look through them and compare them, preferably in your own or a similar design scope. Eyepieces are a very subjective thing and personal preferences obviouly determine a lot of the good and bad features of an eyepiece. For instance, I mentioned that I preferred the Pentaxes because the Radians gave a "warm" image. Many observers prefer this, I don't, so you really need to try for yourself. The important thing if possible is to try and get the variables constant with both. ie targets, seeing, scope etc.
CS-John B
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