[click on image gets you a larger image]
Here the transmission (linear scale) and absorbance (log scale) spectra of these polarizers:
Here now some of the photographic results I got (took multiple images while rotating the filter), presented as animated gifs....
Roofs of some neighbouring houses:
Flowering succulent plant (Cliff maids - Lewisia cotyledon):
Some may have noticed the change of focus, which might be caused by some unevenness of that special polarizing filter foil; it will be investigated later.
Some insects are able to see the polarization angle (and btw. we humans can also, but needs some traing: Haidinger's Brush) especially honeybees which navigate using the polarization angle of ultraviolet (UV) light.
I will make further tests later using the other polarizers and also the special waveplates, which allow for circular polarized light.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos