Hi guys. Can anyone shed any light on this? I'm thinking of buying a Lee Filters polariser for their 100 mm system and notice from their website that they offer circular and linear versions.
Here's what they have to say (http://www.leefilters.com/index.php/camera/polariser):
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Linear or Circular? (...and we're not talking about the shape)
There are two types of polarising filter: linear and circular.
These terms do not refer to the shape of the filter, but rather the way in which the filter modifies the light waves that pass through it.
The type of filter required depends on the camera. If you use an autofocus SLR (digital or 35mm) in, for example, spot metering mode, you will need a Circular Polariser. This is because a Linear Polariser will interfere with the complex metering and AF systems of modern cameras.
If you use a manual focus camera, whether 35mm or medium format, you can use either a Circular or a Linear Polariser. If you are still unsure of the type of Polariser you require, check your camera's instruction manual.
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I have an EOS 7D (Mk I), but there's nothing in its instruction manual about polarisers, despite what Lee suggest. I'm assuming from the above that I need the circular type, but I'd be grateful if someone with more experience of these things would comment on the difference between the two. If I were to focus my 7D manually, could I then use a linear polariser, i.e. Lee's 105 mm version?
Thanks in advance for all replies.
Here's what they have to say (http://www.leefilters.com/index.php/camera/polariser):
_________________
Linear or Circular? (...and we're not talking about the shape)
There are two types of polarising filter: linear and circular.
These terms do not refer to the shape of the filter, but rather the way in which the filter modifies the light waves that pass through it.
The type of filter required depends on the camera. If you use an autofocus SLR (digital or 35mm) in, for example, spot metering mode, you will need a Circular Polariser. This is because a Linear Polariser will interfere with the complex metering and AF systems of modern cameras.
If you use a manual focus camera, whether 35mm or medium format, you can use either a Circular or a Linear Polariser. If you are still unsure of the type of Polariser you require, check your camera's instruction manual.
_________________
I have an EOS 7D (Mk I), but there's nothing in its instruction manual about polarisers, despite what Lee suggest. I'm assuming from the above that I need the circular type, but I'd be grateful if someone with more experience of these things would comment on the difference between the two. If I were to focus my 7D manually, could I then use a linear polariser, i.e. Lee's 105 mm version?
Thanks in advance for all replies.
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