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What size for CPL for Loxia 21 to avoid vignetting?

2xbass

By 2xbass,
in Sony Alpha Full Frame Lenses

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2xbass

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I just got a Loxia 21 and I’m experimenting with using it as a landscape lens in my kit of otherwise bigger and heavier long lenses that I use for wildlife shooting. So instead of bringing the 16-35 f2.8 or anything else I’d just bring the 21 for occasional landscapes. I typically always shoot manual focus for landscapes anyway.

Similarly I was thinking to cut down on space and weight in my pack that I might leave the square filters at home and just go with some circular filters. I’m not using grads as much now anyway.

I ordered a screw-in CPL and some circular NDs online and while the NDs are fine the CPL vignettes slightly when I put it on so I know I need to go wider. The question I have is what size (and step-up ring) should I get to avoid this problem? I could I possibly calculate this from the field of view and knowing the depth of the CPL but it’s a calculation that wouldn’t have much tolerance. I’m wondering if someone else with lens is already using a screw-in CPL. I’m thinking I should go to 62mm. It would be nice also to be able to put both the CPL and an ND on together.

Thanks

Edited by 2xbass
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