> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Bob Turner
> Sent: Wednesday, February 21, 2001 6:44 AM
> To: [EMAIL PROTECTED]
> Subject: Re: EOS When to use a UV Filter.
>
> During the recent Lunar Eclipse I noticed 'flare' in the viewfinder while
> using the 70-200 f2.8 and I wondered what was causing this. I now realise
> that it must have been the UV filter on the lens. Am I correct in this
> assumption?
Could be. One potential problem with UV filters is that when shooting a
light source (OK, I know the moon isn't really a source, but you know what I
mean), the light's reflection off the front element of the lens can be
reflected back into the lens by the inner surface of the filter. In
cinematography, some matte boxes have the ability to tilt one or more of the
filters to help control this.
This is likely to be more of a problem with lenses that have fairly flat
front elements.
Chuck Skinner
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