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Post by Ed Matuod on Jun 22, 2009 15:55:09 GMT
I have this at the rear end of my 600F4 since I bought this lens. Just curious, what's really the function of this polarizing filter? Can I take it off or just leave it there? Help and comments(suggestions) are greatly appreciated. Thanks.
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Post by Teddy Regpala on Jun 22, 2009 20:46:01 GMT
CPL's main purpose is to "filter" out unwanted reflections from a certain direction. Great for blue skies.
It enhances at times the contrast as well.
It will cost you 1 to 2 stops of light!
Nice quickie replacement of ND if you don't have one handy. But the thing is, it'll do only do half the job as a full time ND.
So if you don't need it, might as well remove it.
Not sure about the 600f4, but some lenses that make use of rear or drop-in filters, requires a clear glass replacement. This is a clear filter which is of the same thickness and refraction index as the CPL, to maintain the optical formula of the lens.
Otherwise, you're good to go.
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Post by Romy Ocon on Jun 22, 2009 21:29:14 GMT
What you have as a filter (originally comes with the 500 and 600 f4) is a clear glass that's part of the optical formula, as Ted said. Don't touch it, unless it's dirty and needs blowing out. You can replace it with a CPL if you need such filter.
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Post by Ed Matuod on Jun 22, 2009 21:36:16 GMT
Conscience clear now. Thank you very much, Ted and Master Romy. Greatly appreciated!
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, AFS 18-135mm f/3.5-5.6G , TC 1.4EII, TC 1.7EII, SB-800, Manfrotto 190CXPro3/393(3421), RRS BH-55, Kirk NC300 lens collar
