Dome size is 20cm - works perfectly with the tokina, also with other lenses (sigma 10-20 together with extension ring. As it is acrylic it has some minor scratches which can't be avoided. but they don't have any imfluence the pictures what so ever. I will include a micro mesh kit to polish an maintain the glass.
For the whole lot i can l can lower the price to 530 euro.
I also can offer a tokina 10-17mm - a 60mm f2.8 af-d and a 105mm f2.8 af-d if you would be interested.