A couple of things,
1. use a plumb bob under the lens and a tape line on the floor perpendicular to your art work. Then all you need to do is to measure to the height of the middle of the art and line up the plumber and bingo, you are straight on and square to the work. I’ve also used a laser with good effect to line myself up.
2. if you can, get the cables off the floor.
My tuppence worth
All best
Hugh
from his small studio in West London, where the Whippet sighs waiting for the next opportunity to chase squirrels…!
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