That is great news, Uncle Fred.
Someone else asked me about using the filters with the Great Whites and these were my thoughts - that might be useful:
"I think that the biggest advantage of the filter with the white sharks will be the chance to create different looking images at Guadalupe! I guess what I am trying to say is that flash is hard to beat in those conditions, but the filter is good for some sessions in the cage.
Here are a few thoughts on using the filter with the sharks.
The filter will produce nice colours on the sharks. Setting the white balance will be tricky on the sharks. I think you might be best to use a grey card in the cage? Or even your hand if you are not wearing gloves. But definitely shoot RAW - in case you can't get an optimum WB setting UW - so you can fine tune WB afterwards if required.
I think lighting will be the biggest problem. Look at any ambient light images you have already from Guadelupe (or those of other photographers). The lighting in filter shots will be the same - just in colour. The problem of shooting ambient light in open water is that there is very little upwelled light - so you will have a lot of shadows on the underside of the sharks. Always try and use a (slightly) downward camera angle, so you are shooting with the sun. This will also give you rich blue water colours.
One of the real advantages of the filter (apart from no backscatter - although if you can see the particles then so will the camera) is that you have colour without flash fall off. So you can shoot a shark through the bars of the cage - with both in colour and the bars not burned out by the flash. This could create an interesting image."
Alex