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  1. M

    Prism or Roof?

    Porros are easier to get right optically, but bulkier and very difficult to make waterproof. So very cheap and very old binoculars are porros, but so are some of the best binoculars you can get, rated by optical quality alone, e.g. the Nikon SE range. It also seems to be the case that most roofs...
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