I keep being quoted as saying the WWL-1/1B is not as good as WACP-1 as if that is a bad thing. The WACP-1&2 have no port glass between the lens and wet optic so it is a no brainer that it will be better. The WACP-2 is designed larger so that it can be used with stellar Pro lenses like the Sony FE 14mm F/1.8 (add your brand of Pro lens here) which makes it a better choice image quality than WACP-1. By this logic all full frame users should be using WACP-2, which can also be used for splits by
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