Done that too - many times. It’s strange that you can see the runway from 7-8 miles out, then at 0.5 miles you hit that fog bank. Hold it steady, then you burst through the fog bank into CAVOK, with the runway in front of you.
ISTR quite a while ago a report in Air Clues. A Senior Officer was handling pilot of a C130 returning to Lyneham. He reported visual with the runway from a very long way out and said that he'd be doing a visual straight in approach. The ATCO told him that the rvr was below IFR limits because of fog, and he should expect to need to divert, and finally ordered him to go around into the Missed Approach procedure. Captain ignored the instruction, ran into the fog bank, and wrote off the aircraft in the ensuing heavy landing.
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