I have a shooting session with painters to take pictures of their paintings for catalogs. The will be very large frames : 2m x 3m and smaller ones.
I never took photos of such large pieces of art. What is the best way to enlight those paintings ? Light box, ombrella ? I thought about 4 lightboxes, 2 on each side with an angle of 45° at about twice the distance between the camera and the painting. What is needed of course is a very homogenous light.
If you cannot use polarized light, it will help to use lighting surfaces that are as large as possible, because that will make specular highlights overall larger as well, and light fall-off with distance is less. It also depends on the painting technique that was used.
The camera will be a 645 DF+with p65+ DB. 80 mm or 28mm lense ?
Longer focal lengths will offer easier to achieve perpendicular alignment to the painting surfaces, and they allow more even lighting because the lights can be placed relatively closer to the camera and further from the paintings.