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General photography questions and answers: Discuss Should I use Polariser filter for HDR ?...Going to experiment with Auto bracketing for HDR shots tomorrow , but just wondered how Polariser filter may effect HDR ...
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Old 18-10-2007, 13:39   #1 (permalink)
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Should I use Polariser filter for HDR ?

Going to experiment with Auto bracketing for HDR shots tomorrow , but just wondered how Polariser filter may effect HDR processing ?

Anyone any ideas ?
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Old 18-10-2007, 14:18   #2 (permalink)
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Re: Should I use Polariser filter for HDR ?

It shouldn't have any effect if you don't rotate the polariser between shots. The light comming through the polariser sould be the same for each exposure. The only difference should be the exposure time.
It is probably a good idea as Photomatix (iif that is what uyou use) does tend to produce halos around dark obects against the sky. My photo in your thread positng on HDR shows this effect in the patch of sky. The further away from the trees the darker the rendition of the sky. By fiddling in Photomatix the effect can be reduced but at the expense of tone separation.
If you use the polariser to darken the sky this problem should be reduced.
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Old 18-10-2007, 22:49   #3 (permalink)
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Re: Should I use Polariser filter for HDR ?

Bear in mind that if you use a WA lens the pola will likely increase the difference in tone/colour across the sky areas possibly making it more difficult to get good sky tone.
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Old 18-10-2007, 23:18   #4 (permalink)
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Re: Should I use Polariser filter for HDR ?

I did some bracketing today, using a polariser, and have to say I noticed very bad blue fringing where thin branches were set against the blue sky, so I had to base all my compositions on avoiding branches directly against the sky
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Old 19-10-2007, 10:54   #5 (permalink)
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Re: Should I use Polariser filter for HDR ?

Quote:
Originally Posted by Charlotte View Post
I did some bracketing today, using a polariser, and have to say I noticed very bad blue fringing where thin branches were set against the blue sky, so I had to base all my compositions on avoiding branches directly against the sky
That's interesting. I did some bracketting without a polariser and found that I was loosing sky colour round branches. Perhaps there is a compromise somewhere by using the polariser at some intermediate angle to just enhance the sky a bit rather than go for full on dark blue skys. It's worth experimenting.
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Old 19-10-2007, 13:57   #6 (permalink)
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Re: Should I use Polariser filter for HDR ?

Left it on full for this shot :- http://www.pixalo.com/community/phot...tml#post161100
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