Nikon 10 x 50mm: Action Extreme or Trailblazer?
Optical performance will be better on the Action Extreme, but handling and durability goes to a roof prism like the Trailbalzer. In order to make a roof to the same optical standards as a good porro like the AE, it will need to be phase-corrected. That would be the Monarch in a Nikon.
For the basics on binocular construction and features is easy to understand terms, see my article at
How to Understand Binoculars
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