sample 56 wood 2 (the newer and brighter one with a less clear 
anisotropic structure)

anisotropic

roll angles 0 90
zoom as before
aperture: 1 tick past 5.6
parameters z=330 p=18 l=170

this sample seems to consist of two parts: a rather specular 
one on the left (bigger) and a not so specular part on the 
right (smaller).

This sample is not centered on the holder. I center the sample, 
not the holder because that's very hard to see.