With the airshow fast approaching I'm wondering if you guys can reccomend any lenses that might prove to be useful? I have 2, an 18-55mm, and 70-300mm. I feel like I need something that will zoom in further. I would like to be able to get some good shots this year. It's not usually an annual thing, I have no idea when the next one will be, and it's looking to be an awesome line up this year. So what can you guys reccomend that won't break the bank?