polarizing filters - advice please

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Ants

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Can someone help me please?

My local photography shop is closing down and is thus having a big clear out.
They are offering filters, 2 for the price of 1.

I have a Minolta Dynax D5 (or is it 5D?), with 2 lenses, the kit 18-70 AF 55mm filter and a Sigma 70-300 AF APO 58mm filter, both auto focus.

I want to get a polarizing filter for each lens but they have linear and circular filters in both sizes. The staff in the shop couldn't care less at the moment so didn't seem to want to help.

So could one of you fine guys please help me understand the difference between circular and linear polarizing filters????

Thanks


Ants
 
In my oppinion youd find the circular ones of most use , as you turn them to get the best result, someone better will explane what i mean but go for the circular ones
 
Circular filters are what you need for auto focusing lenses. The science behind the difference is quite involved something about quarter wave plates behind the polarizing foil on the circular filter blah blah blah. All you need to know though is it's the circular for modern AF cameras.
 
Thanks for the prompt responses, :thumbs:
by the way, the shop in question is Jessops in Blackburn, they've knocked 70% off most stock...............................which brings it in line with the internet dealers!!!!!:lol:
 
As ajophotog says a circular polarisor is really just a linear pola with a quarter wave retarder laminated to the rear of it. A linear pola wil work in both directions but the circular is faced to only work one way. The cameras auto focus will not work correctly with linear as it stops the light focusing beam from going through it.
Dont you hate it when shop staff just cant be ar*ed.
Dean:)
 
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