This is a grain focuser. And, in a way, this
was one of the hardest pieces of equipment for me to learn how to use in this darkroom.
And, what it does is, you actually put the focuser on the surface that you are printing
and it looks up into the negative. And, as you are focusing it, it lets you see the grain
of the negative. And, when your grain is sharp, that means you are in focus. Because it is
possible to print an image that you took in focus and you could print it out of focus.
And, there is, nobody wants to do that. So, the way the focuser works is again, you put
it down on the surface and very slowly you move this fine focusing handle up and down.
The way I learned to look for this grain was that it almost looked like if you had taken
a magnifying glass and put it over newspaper print. You start to kind of look for stuff.
And again, it took me a couple of days. This is also a precision thing. It is back to what
I was talking about before. You do not want to just guess. You really want to make sure
that that is in focus. After you have it in focus, you want to take this lock and lock
it down to make sure that focus does not slide on you.