Okay, so I get to bring my black lab pup home a week from friday, and I really want to make sure I get plenty of shots of him playing outside... I know that snow can be quite evil, and with the contrast between a black lab and illuminated white snow I'm expecting it will be quite a challenge.. Any tips on how to approach this? Also, will a filter do me any good? They threw in 3 different filters w/ my Sigma 70-200mm lens for no extra cost (Polarized, UV, and one other).. they seem quite solid, but not multicoated.. Was wondering if it would help or only make things worse.. Thanks!