I have noticed that more often than not my negatives are not in focus as i would like them to be. This is esecially true with my 90mm focal lenght. I beleive it might be my technique that needs refinement. I would love to get some step by step advice on how you critically focus a 4x5 camera, and any tips that might help increase the percentage of keepers in focus. =}

Thanx in advance.