In real life both periscopes are the same except for the prism and head size. The observation periscope lets in more light but is more easily spotted. The attack periscope is harder to see through but also harder to spot. Other than that they are identical.
The UZO is nothing more than a pair of binoculars fitted to a stand. The only aid it gives is to have a much better field of vision than either periscope, and a circular "compass" ring marked in degrees.
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