My 5c worth is that the worst part of the optical train dictates how good your view is going to be: and 1/4 wave is the only one of these that wont make your image worse. Anything less is a compromise: but if you are going to compromise I would suggest you don't go for 4 wave... I suspect it would be like looking at a reflection in a lake, or using your binos through a window!
- Dean
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