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08-13-2012, 10:05 AM   #1
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CP filter or step-down ring?

Hi Guys,

I have two lenses with thread diameters of 52mm and 67mm in the front. Now I also have a Tiffen 52mm circular polarizing(cp) filter which is for the 52mm thread lens. The lens with the 67mm thread has been recently acquired and it is going to be the one that will go with me much more than the other lens.
Would you purchase a separate 67mm cp filter? Or can a step-down ring be used for using the existing 52mm cp filter on the 67mm thread lens?

08-13-2012, 10:25 AM   #2
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You'd probably get a dark circle around the images because your 52mm filter won't cover the full area of the lens's front element. There might be some rare lenses where it would work, 99% of the time it won't.
08-13-2012, 10:27 AM   #3
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Well, you could just hold it in front of the lens and see if you get any vignetting.

But I would say it is almost certainly not going to work. There is a reason the front is 67 mm. The manufacturer wouldn't use a front element that large, and add to cost and weight if it weren't needed.

You didn't say what lens it is, but if it's a zoom, it might work at some focal lengths. Kinda defeats the purpose of a zoom lens though.
08-13-2012, 10:51 AM   #4
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Thanks Dave and Tanzer. I thought so and you guys have confirmed it.

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