Quote:
Originally Posted by captain27
Ok, please check here.
Do you see a Merchant boat?
There is one, as per the Map.
Do you think it is much visible to do any attack during night?

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From these screenshots, I'd say the problem is not with brightness but with direction you're looking in. Target is slightly to starboard, you are looking too much to port and from clouds clearly visible in lower part of periscope view, much too high as well: