Originally Posted by DREW WILEY
I agree wholeheartedly.
The OP was talking about multi-coated B+W filters, which are as good as it gets for filters; plano-parallel Schott glass and top-notch coating. The effect of using one of these, when you have to, would be negligible. Sure, a lot of "negligibles" will add up to a tangible, but we were just talking about filters. The real question was if a particular color (orange) itself was responsible for degrading the quality of the image. I rather think not. The culprit is likely something else besides the color of the filter.
As to craftsmanship and careful working: Yes, don't use cheap and uncoated filters, get the best optics you can afford, etc., etc. I'm way with you there. I replaced all my pretty-good filters with B+W filters some time ago.
On the other hand, if you are a careful worker and the need arises to use a bit-less-than-optimum-quality filter, that alone is not going to make a noticeable difference in the final result; it is only one "negligible."
And, sometimes, "good enough" is really good enough. The best modern lenses are indeed superior to much of what was used in the past. We have things available to us that were not available (or affordable) for the likes of Adams, Weston, et al. Nevertheless, they made the best of what they had and some rather good images as well...