Hello all. As an experiment, I have a friend with a professional camera and I thought it would be neat to recreate a scene with Luxrender and compare camera settings to Luxrender settings.
I had my friend take a series of 7 pictures from a tripod at different f-stops and shutter speeds. I then modeled a replica of the scene in Blender and rendered out with the same camera settings on Luxrender.
The camera model is a Canon EOS 5D Mark III. Settings that stayed the same were- ISO: 100, Focal Length: 42mm, Exposure program: Aperture priority, No flash.
Essentially I tried to model fairly close to the scene in Blender, then used a sun and hemi with an hdri map as close to the lighting at the time of day we took the shots. I modeled the basic interior of the room including window openings. Then I adjusted the light strengths/gain until the first render matched as close as I could get it to the first photograph. My theory being that if the first ones matched, then if only the camera settings changed that they would all match.
Here are the results (right click - view image
to see the whole thing):
The camera settings listed are the same for the images directly above and below each other. As you can see, there is almost no difference in the luxrender images, but a noticeable difference in the camera pictures. The only way I noticed a difference with the lux images was laying them right on top of another and selectively hiding and un-hiding the top image. Otherwise I can't even tell.
Anyway, thought I'd post the results of this silly experiment here. If anyone has any insights as to the reason for the difference between the camera and Luxrender, I'd love to hear them.