circular polarizer multi-coated glass or not?


abesad

Link Posted 01/05/2010 - 12:30
Not sure if I have put this on the right forum. I am thinking of getting a B&W Circular Polarizer, what is the different between multi-coated glass or not.I want a good quality and to use with auto focus. Also I have on my lens a hoya hd protector, if I put a polarizer ontop of this one, will it effect the quality of the photo taken.
Thanks very much everyone for taking the time to look and hopefully answer these questions.
susan

gartmore

Link Posted 01/05/2010 - 14:34
Multi coating dramatically reduces reflections and is a very good idea.

There would be no sense at all in using a so-called 'protector' with a CPL you would be adding another 4 relective surfaces in front of your lens, a very bad idea.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

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terje-l

Link Posted 01/05/2010 - 14:39
B&W is certainly a quality brand.

The coating prevents reflections, and is water repellant. Any high quality filter manufacturer will add a good coating, multi or not.

I would never put more than one filter in front of the lens. The more glass the more trouble.
Best regards
Terry

K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ

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abesad

Link Posted 01/05/2010 - 15:13
Thank you, what about if I just used the polarizer, and also an ND grad filter in front, would that make a difference to the photo as well.
Thanks again
susan

terje-l

Link Posted 01/05/2010 - 16:47
That would still mean four reflective surfaces in front of your lens. Besides, the CPL filter needs to be rotated to achieve maximum effect. This is difficult if you want to have an ND grad filter in addition, which also needs a specific orientation (i.e. vertically).

I think you will reach your objective with either the CPL or the ND grad, depending on light condition and the angle of the sun.
Best regards
Terry

K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ
Last Edited by terje-l on 01/05/2010 - 16:48

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abesad

Link Posted 01/05/2010 - 17:04
Thank you Terry.
regards susan
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