[Platapus]

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The Observation periscope is bigger than the Attack periscope. I do not know if the game actually models the difference in the light gathering capabilities between the two apertures but the Observation periscope was better in low light conditions.

Also the Observation periscope was able to be elevated more than the attack periscope. I wonder if, in real life, if the Observation periscope was used for photography?

One thing to be very careful of in this game…

If you have the habit of using the Observation periscope and the Attack periscope, be sure that you double check to see that you have lowered the Observation periscope when you lower the attack periscope.

Not that anyone here would be dumb enough to lower the attack periscope and forget that the observation periscope is still up…no you would really have to be dumb to do that….Trust me, it aint a good thing to do <hanging head in shame>