AFAIK, "normal" glass is opaque to UV rays. You need flourite lenses
to photograph in the UV spectrum, while much of what is known as UV
photography is actually flourescence photography. I don't know what
the transmission characteristics of ED glass is.
Which means that UV filters won't contribute to elimination of UV
light from your shots, because none is getting through your lens
anyway. OTOH, they usually remove a little of the barely visible near
UV, so will trim some excessive blueness from overcast or open shadow
light when you're using film and can't adjust white balance per shot.
Skylight filters just cut a little into visible blue wavelengths while
UV filters only cut invisible blue wavelengths, but not enough to
matter when you can tweak the WB instead.
Which raises another matter. FIlm was oversensitized to UV so
vulnerable to shifts in that direction. Digital sensors, especially
CCDs, are oversensitized to IR but are usually protected by "hot
filters" (more or less effectively from one camera model to another).
They are relatively insensitive to UV light.
Which leaves protection as the only real motive for using a UV filter.
I live on the coast, and feel better about cleaning dried salt off a
filter than off a lens.
regards, Anthony
"Of what use is lens and light
to those who lack in mind and sight"
(Anon)
2009/9/9 eckinator <[email protected]>:
> Is there such a thing as a final verdict on UV vs Skylight vs
> 'Protection' (whatever those are - do they block overprotective rays?)
> Filters?
> I need to buy one for my 16-50 seeing the time I spend in sandboxes
> with my camera these days... a blower wont do the trick for me all the
> time.
> Thanks
> Ecke
>
> 2009/9/9 Larry Levy <[email protected]>:
>> I come from the capital K Klutz school of carefulness. Starting with the
>> 10D, I've been putting Giottos Aegis screens on the LCDs. It's a lot cheaper
>> to replace if (when) something goes wrong.
>>
>> I'm also one of those who typically puts a UV filter in front of the lens.
>> When I dropped my camera bag in an airport, the only damage was some
>> cross-threading in the lens (which Eric fixed for me) and the replacement of
>> the filter (which had given itself up to save the lens).
>>
>> Larry in Dallas
>>
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