Quote - i think it's your camera scale--you've got the poser cam scaled up to 200%+ & when i reset it to 100% it looks just like the luxrender.  so try changing that & see if that does it for ya.  interesting problem.

Yay! Spot on - that's the problem solved.
I have no idea why the camera was rescaled - it's not something I've ever done consciously so was probably mentally blinded to the reading on that dial.

So it was me after all :-)
Huzzah!

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