Here is a demo scene using the basketball court 8K LDR at 1x brightness.

I'm using a focal length of 27 mm.

The background (where we see the EnvSphere image above the wall) is sharp.

However, the lighting is dark and reflections are dull.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)