FOV Vs. Low Light Performance?

I have a 5MP (Axis P3367-VE) in an outside area that gets fairly dark at night. Right now I have the camera set at 50% of max FOV and 1/30s max shutter, and the images are "barely" usable* for facial capture. Unfortunately I don't have remote access and performing night-time tests are difficult. So, here's the question:

I only need to capture an area that's about 1/4 of the...

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