gainesn wrote:
I was setting up to take a picture of the steam train run through north georgia. I was roughly 30 feet off the track, camera with wide angle (16mm on D7500) on a graphite tripod. I pre-focused, manual focus, on the track at f8 apeture. Shutter speed was about 125 - 250. (ISO set to 100 in apeture priority). The test shots were perfect. The train pics are all blurred. Is it possible the train whistle, blurred the picture? I did not feel any vibration in my feet.
Yes ! Probably the reason has been mentioned. The vibration from moving vehicles and especially trains can be seen when making sensitive measurements but not necessarily felt. Working at labs in Boulder, CO we used light to measure the heights, in micro inches, of magnetic heads flying over rotating hard disk surfaces. We had an unexplainable problem with vibration that was caused by heavy truck traffic and trains passing by a 1/4 mile away. And the tripod near the train tracks was a perfect conductor into your camera.