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Hello, I've just tried to use Sigma 15mm + kenko 1,4x with a 4" mini-dome (with Nikon D800). Above water no problem, AF was ok in all the range, but underwater I realized that I couldn't focus at the minimum, and the minimal focus distance got longer than above water of about 8cm. Is it normal? It's due to the dimension/shape of the dome? I think to try to use an extension of 1,5cm betweeen dome and housing, should this help? Thank for any suggestion.