Quote Originally Posted by dancqu View Post
A square or triangle, draftsman's or grade schooler's, is
needed. Ninety degrees is THE angle. Only TWO checks of
the internal angles need be made. If the object projected
is a rectangle and the projected image tests square at
two corners the enlarger is well aligned.
That's true! And the OP should be more that happy to spend his $100 buying more film and paper IMHO.