Response to lightproof door, enlarger setup

When you first set up your enlarger, the base board, lens board and film carrier board should all be carefully levelled. To check for sharpness in the corners, take an exposed and developed (black) piece of film. With a fine point scratch some x's in the middle & at the 4 corners on the emulsion (dull ) side. Put the film in your negative carrier and focus on a large white sheet of paper. The scrath marks should be sharp everywhere. If not, try focussing with your adjustments.

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