I just purchased the K-5 kit with the 18-55mm lens. This is my first DSLR camera and at the risk of sounding very ignorant about cameras (which I am)I am having a problem and have a question for the more camera savy folks here. I also purchased a prime 70mm limited lens and have used it almost exclusively since my purchase. I took about 5 pictures with the kit lens the first day I got the camera but have sense used the prime. Today I got the kit lens out and was taking some pictures of my kids and noticed the pictures were pretty dark and blurry. I did not notice this from the first few pictures I took by the way. I am also noticing a very strange grainy look while looking through the view finder with the kit lens only, The prime is crystal clear. Do I have a defective kit lens or is this normal for them? Does anyone have any ideas about what's going on? Is this normal? Thanks for helping a complete newbie.