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periscopes

    Hey all,

     I'm rather new to this and I apologize for any faux pas I may
commit in the act of writing...but...
    I was curious about what the best way to go is as far as
designing/building a nice simple periscope.  Don't know much about what
lens('s) to choose n etc.  Or is it relatively easy to see surface
craft approaching when looking through viewports at depth?  A collision
would really be a downer.  Any help you could offer would be great.

                                 thanks,

                                    Chris Nugent

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