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This lens stage alignment board for Beseler 45 and 23 enlargers is easy to use and inexpensive. The Bes-Align enables you to calibrate your lens alignment to the new factory standard of 1% accuracy. Front to back and left to right adjustments are provided by three control knobs allowing you to align your Beseler enlarger in minutes. Kit includes a high contrast test negative, which allows you to test for lens fall-off, lens distortion, edge sharpness and parallel alignment of the critical lens stage and enlarger baseboard. Complete instructions are included.