That shot was taken with a Sigma 150-500 on a Nikon D90. It was not cropped. The tricky part is setting the camera. Everything needed to be set manual because exposure and focus will hunt and NASA won't do it over for you, go figure! Of the 15 shots in the sequence this is really the only good one. The rocket flare reflecting off the smoke illuminates the ship, before this you only see smoke, after only flames.
The causeway is 6.5 miles away, the closest most civilians can get. We made a special trip driving down from Cincinnati just to view the launch (bought the lens too). Spent 2 nights out in the cold, the 1st was scrubbed for weather, the launch was at 4 in the morning. I've always wanted to do it and was running out out of launches, the experience was worth all the pains and money we went through.