Roof Prism or Porro Prism?
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Roof Prism
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High Price $200-$2,000
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Often Waterproof
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Sturdy design
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Straight barrel - smaller
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Porro Prism
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Inexpensive $20-$500
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Not waterproof
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Less Sturdy
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Bent barrel - bulky
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Top optics for less $$