I do have one Tiffen filter which destroys lens performance. It was attached to a Vivitar Ser 1 90-180 medical macro zoom that the previous owner thought was a dog (it isn't) and wanted to trash. The filter looks fine, however, when placed on any long focal length lens, the image is soft. I think the effect is due to a lack of planarity across the glass which gives a small, perhaps variable, +/- curvature. On a long lens, the effect of a filter that doesn't have a focal length equal to infinity becomes more pronounced. Anyway, I don't use Tiffen filters.
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