Hi, I'm not sure how to start a new post, so I thought I'd put it here, I recently bought a Sigma 10-20 mm lens for my Nikon, every picture that I have taken with it appears to have a blue tint to it. These are two examples, taken on different days at different times. Any suggestions as to why the blue? I know i can fix it in pp but don't want to have to. No need to critique the actual pictures, lol.