I'm in the "no filter has to be better than even an expensive filter, because I hate air-glass interfaces, BUT...
The effect you get from stacking multiple filters is geometric, not linear, so I really don't think this has proved much at all on the relative degradation between a single high-quality and a single mediocre-quality filter. Since I'd only ever put a UV filter on my lenses in a situation that is highly abrasive (like to shoot on a beach in a howling wind, or something) I'll stick with the inexpensive ones, and sacrifice 'em as needed (which I've anyway never needed to do).
R. |
