We have the it's Christmas, what lens "Should" I buy myself thread. How about the It's Christmas, if I could have anything, what I would buy myself thread. Keeping in the realm of photography, what would you want? For me, a nice new and shiny Nikkor 600mm f/4. Yes, that's the ticket. I already have a 400 f/3.5, and a (gag) 500 f/8 mirror. So the 600 would fit nicely in my kit. Well, as big as it is, "fit" is a work that doesn't.