I use glass carriers I over 10 of them, and I have dedicated full frame indicators on the back side of each one for each format. This allows me to always know where the dead center location is. And yes I always move the negative into position rather than move the easal.... this is what I am trying to point out to the OP and of course Doremus.
On one of my threads I have alluded to this practice, learned after years of making mistakes....
Moving the easel for crop is a very bad practice... a hair ok but the sweet spot is the sweet spot , no sense arguing this from my point of view... others may like burning in edges and having soft areas, I prefer even light and sharp corners.
Originally Posted by tkamiya