Hi--

>Ummm!
>I was in LA last summer. While at the beach I shot a few frames
>including the ocean. The day was particularly smoggy. I could not see
>the horizon ( my vision is excellent). I put a UV filter on and then I >could see the horizon through the camera. OK, but the proof is in the >pudding. In the first set only a few boats close to shore can be seen. >The one that I used the UV filter (smog is UV intensive) many boats and
>the horizon are clearly visible.
>Hope this help?
>Dave david.austin@k12.uen.gen.ut.us

Thanks for your reply. I am at a loss to explain this, if air conditions remained unchanged while shooting with and without the UV filter (they
can change quickly near the water!). In B & W, even a dark yellow (NO UV PASSES!!!!) filter makes virtually no difference unless the subject is
very blue (haze is not affected). In color, the only time I would expect
to see a very subtle difference would be under very high UV-level conditions, like yours, using a very simple lens (since most lenses do filter out most UV with or without the added filter).
David Ruether

>> Ummm!;-) Most lenses remove virtually all of the UV that a usually
>> encountered type of UV filter can, so the UV filter has no effect on
>> the photo in terms of UV. Any good-quality filter has no detectable
>> negative effect on image quality (except, perhaps, when shooting
>> directly into the sun with some lenses and non-multicoated
>> filters), so a good UV filter has no effect
>> on the photo most of the time.
>> Hope This Helps