Graeme Gill wrote:
For some people a UV-cut instrument provides an easy way of solving FWA/OBE issues. [My theory is that this is only the case when they are viewing the results in a UV poor environment].
I guess UV poor viewing booths will become more and more rare in the future as the 2009 revision of ISO 3664 tightened the tolerances for the UV Metamerism Index M(UV). While it was reatively easy to meet the ISO 3664 M(UV) criterion in the past, several manufacturers had or still have to increase the UV portion of their fluorescent lamps (and have to replace UV absorbing panes found in some elder viewing booths) in order to meet the new tolerances. This is one more reason /not/ to buy UV cut instruments IMHO. Even better would be to buy an instrument which meets the (also relatively new) ISO13655:2009 measurement condition M1, which provides a measurement light source much closer to D50 than the lamps commonly found in current UV-included (mostly M0) or UV-cut (M3) instruments. Unfortunately M1 instruments are still rare (to my knowledge there is only Konica Minolta FD-5 / FD-7 and Barbieri SpectroPad at the moment). Klaus Karcher