That's a good lens, but keep in mind that the depth of field at 1.8 will be razor thin. What lighting conditions will you be taking the shots? If its outdoors and sunny, you won't need f1.8 to achieve a high shutter speed.
That definitely crossed my mind about the DOF being so thin. Some of the shots I have envisioned, I want to try and get a behind and off to the right shot, so I can capture the muzzle flash and the brass ejecting. I definitely wouldn't want the rear of the rifle to be in focus and the muzzle out of focus, so that is definitely a concern.That's a good lens, but keep in mind that the depth of field at 1.8 will be razor thin. What lighting conditions will you be taking the shots? If its outdoors and sunny, you won't need f1.8 to achieve a high shutter speed.
I was looking at the 50mm lens as well, but I wasn't sure which would make a better candidate.what D said. In fact you might even want to go with the 50mm F1.8 or F1.4 just because you will gain a slight DOF advantage over the 85mm. But even with that, focus is going to be SUPER critical. Personally I would try to keep it above an f4 and just crank the ISO up to 1600. Unless you're trying for a bullet shot, something around 1/1000 should be more than enough to capture what you're looking for.