Quote Originally Posted by Jim Jones View Post
Sometimes an enlarger baseboard becomes warped over time, tilting the column in relation to the baseboard. I've had to shim the foot of columns to restore alignment. A laser alignment tool is one of many methods of checking alignment. I prefer to use a clear negative, abraded with coarse and fine sandpaper, as an alignment target. It is cheap and convenient, and works very well in condenser enlargers.
Thanks very much, Jim. I was just using a carpenter's level and then looking thorugh the focuser at each corner. I hadn't heard of the scratched negative method. That's a great idea.

What kind of enlarger do you use and about how often do you have to align it?

I did adjust the column a tad bit as well...no shims, just alternative tensions between the front and back (sort of like one would do with a bicycle seat to adjust the tilt, if that makes sense)