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Old 18th March 2015, 12:05 PM
Adrian Adrian is offline
Join Date: May 2012
Location: Yateley in Hampshire
Posts: 206

Sometimes the variation can be quite subtle. I found running a 2kW fan heater off the same ring as the enlarger made up to -0.3 stop change in exposure. The enlarger lamp runs on 12 V and I just had a simple step-down transformer. Changing to a regulated 12 V DC power supply cured the problem.
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