Tokina 12-24 mm and seacam SD

Hi,

does anybody know the right extensionring for the Tokina 12-24 mm and Seacam housing with the superdome??

Rob

I don't. With the Nikon 12-24, I could get good corners with the SD with 55mm extension and a B&W +2 dioptre (but you lose some angle of view). With the dioptre, the apparent front entrance pupil is about 64mm in front of the camera lens mount. If you measure where the apparent front entrance pupil of the Tokina is, you might then get an indication of extension. I like to put it at the centre of curvature of the dome.