Any filter will only degrade flare performance of the lens, though just slightly because of the filter's multicoating. Depending on UV content of the scene and your desired rendition, a UV filter may "improve" picture quality despite marginally greater flare.
If the UV filter is on the end of a good, deep lenshood, it might improve the picture quality! ;^)
If one's in a uv prone area, such as high altitudes, it can improve picture quality. But, that's not related to the filter being multi-coated, only to it's being a uv filter. Note that Schneider multi-coated lenses also provide uv and infrared filtration (without a filter).
If Schneider uses the same multi-coating on the filters that they do on their lenses, it seems reasonable that a Scheider MC coated filter could provide some IR filtration, as well.
Neil, do you know to what effect Schneider's coatings block IR? I was planning on getting some 4x5 IR film and using my Schneider lens - old single coated 90 SA and 240mm Tele Xenar. Would this combo work?
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