Mark101
Pooh-Bah
Reged: 15/03/2007
Posts: 1717
Loc: Lincolnshire
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I have an old Cokin P160 Linear Polarising Filter which I've just attached to my Canon 40D. Now I thought a modern camera needed a circular filter because of all the reasons we are told. What I've found strange is that all the shots I've taken are perfectly exposed and in focus - How can this be?
I've played around with the filter darkening the imaged etc , but again the results are always in focus and exposed correctly.
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Cavyslave
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El Sid
Going potty
Reged: 14/04/2003
Posts: 10737
Loc: Sussex-by-the-Sea
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I've never has a single problem with my linear Cokin polariser either. Indeed the only polariser that has ever given focus problems was a circular type. Set at anything other than minimum effect you couldn't focus at all...
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Nigel
Completely BSRIPN 
ElSid Gallery
Terrorist?............or potential photographer?....... 
There are no people more opressed than those who willingly opress themselves
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LargeFormat
Pooh-Bah
Reged: 24/10/2006
Posts: 1902
Loc: Cumbria and Buckinghamshire
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might there be a difference between phase detection and contrast measurement focussing?
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parisian
Over the hill and far away...
Reged: 10/02/2002
Posts: 9297
Loc: Môn mam cymru
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I was always taught to focus first and then apply the filter effect 
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Hells pensioner - born to be mild
JustMono
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Steve_F
newbie
Reged: 29/01/2008
Posts: 23
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Hi,
I've always been led to believe that the difference between a 'Linear' & 'Circular' polariser is that if you use Auto-focus or Spot metering then you need the 'Circular' type. As a result I've only ever purchased this type.
Does this help?
Steve.
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"Personal Development Through Image Construction"
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Mark101
Pooh-Bah
Reged: 15/03/2007
Posts: 1717
Loc: Lincolnshire
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Quote:
Hi,
I've always been led to believe that the difference between a 'Linear' & 'Circular' polariser is that if you use Auto-focus or Spot metering then you need the 'Circular' type. As a result I've only ever purchased this type.
Does this help?
Steve.
Thanks but no, because the linear one seems to work on my 40d
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Cavyslave
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