[POKO]

Hi,

This doesn't really answer your question, but some have already started a discussion on lighting, so I thought I would add some experience.

I recently had to fly across the country to shoot some paintings. I just used a standard lens, the tricky part is getting the painting square and dealing with the colors/reflection.

You will need to double polarize - use linear polarizers, not circular. Put large polarizing gels over your lights and the cross polarize over the lens. (not sure if you have ever held two polarizers on top of each other, but they will black out at the point where they are cross polarized) Just mark the top of the filter/gell at this point and replicate once mounted on camera/light.
You will see a HUGE improvement in the quality of the reproduction.

Good luck.

Per