It happened just now and I can't fix it. I focus my print, run it through and it comes out not-in-focus. I readjust, act quickly and it's still out of focus. So, I adjust the tension knob on my 4x5 beseler and still the same problem. What I found out is that when I look through the grain focuser and hit the expose button, it starts out of focus and comes into focus gradually over 15 seconds. Any thoughts on solving this besides waiting with a shhet under the lens 20 srconds before exposure?