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Explatation or advice needed on CPL/ Skylight filters please!

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Dear all, I went to the zoo last weekend (remember that ultra sunny day?!!) I decided my skylight just wasn't cutting it so i thought a darker filter was needed so i put my circular polarising filter on. From this point on my exposure was really over exposed i was having to dial in upto 2 stops and this wasn't consistently working.

My apparently naive logic figured a higher the density filter would work. i switched back to the skylight and left it at 2 stops to check and as expected it was black!

Can anyone offer a technical explanation into this occurrence?

Many thanks Very Happy

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Do you have any examples of the problem pictures online?

View user profile http://www.flickr.com/photos/llamnuds/
No sorry i edit as i go. Don't know why, i'll never fill the memory card!

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I'm very much still learning myself, so it would have been very interesting to analyse your meta-data and compare your pictures.

I think without the actual pictures it down to guesswork.

I don't think your logic was flawed, polarisers do reduce the light, that's a fact as afar as I know; so perhaps your recall of the events is not quite spot-on?

View user profile http://www.flickr.com/photos/llamnuds/
that's ok hopefully it won't happen again but if it does i'll save them Very Happy thanks for your help.

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