One option to dealing with a very wide EV range in Poser could be to render to a 32-bit image, either HDR or EXR (IIRC turn off tone mapping, enable HDRI optimised output and set gamma to 1 in the render settings).

Then you have to use a third-party app to tone map the resulting file to display or print it - I've used both Photoshop and Photomatix Pro, though I know there are a number of others too.

 

edit - oops, cross posted :)

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