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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.

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If you use a tele-converter you must move the dome out the same distance as the length of the tele-converter to keep the dome in the proper placement. This will affect the virtual image and the minimum focus distance.

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