Hi i have bought my first water housing and its a vintage one. Its a aquatic 4n for the nikon f4 and it has only got a flat port. However i want to use my 21 mm carl zeiss lens but then i guess i need a 8 inch dome (It that what is reccomended?) I have looked onlig but they are so expencive. And i don't want to buy the wrong one. Since its an old type is there some adapters or does the new aquatic domes work for the old camera housings as well, I hope i made myself clear and i hope there was not to many questions here. But its so hard to find answers when there is so little information about this online.