I'm planning to do a short film and would like to use my D90. It's a very simple piece with one location and one actor preforming a monologue. I've got an array of manual, nikkor primes (28mm f/2.8, 50mm f/1.4, 105mm f/1.8 and 135mm f/2.8). I've done some tests with my gear and I'm concerned...