Too much blur or noise?
Technical question.... For those that don't know me, I'm pretty new to DSLR's, and technical photography. That said I have a question. Is there too much noise and/or blur in this photo? It's shot at 3:38 pm. We were driving down the road about 50 mph. It's shot on Shutter Priority at 1/4000, F7.1 with an ISO of 400 - to get the 7.1. The focal length was 53mm. I was using the Center Weighted Metering Mode and AI Servo AF Mode. My dilemma is when I expand the photo to 100% or more the details aren't as crisp as I think they should be and I can see the noise in the sky. I've shot this same scene at all kinds of different shutter speeds to get the greater DOF but they end up too blurry, or too dark and if I turn the ISO up to compensate then I get too much noise.
Yes, I know the logical thing is to pull over and take it at a standstill but since I ride with my husband on his calls, that's not an option so I'm trying to overcome the effects of being in a truck. 90% of my photos are shot this way. I have a screwed up back and don't drive a lot on my own or walk very far - hence, trying to overcome movement. Any suggestions?