Sorry, a question about filters yet again.
I have just received the most expensive lense I've got up to now for my birthday - Nikon 24-70 2.8 - and I'm after getting a filter as protection on the front. I do a lot of photography in a dog shelter, and the dogs can be quite lively. The question is which price class? I assume a cheaper filter will or could effect the quality of the photo, but just how high will I have to go?