Alright im new to photograpghy but ive done my share of point and shoot. I have a Sony DSC-V3. Great camera and it takes some great pictures IMO but ive been looking at different lens' but i have no idea what the differences are. I do lots of close things such as animals and reptiles but also take many outside pics and pics of mountains and sky here in Colorado. I know those are two different sides of the spectrum but if need be i could always change out lens for what im shooting right? What should i be looking for as far as lens go?