I have a first generation, Zone IV, variable contrast, enlarger head and controller. The first generation was unimaginably slow or dim. I managed to adjust my expectations, but exposure times, depending on contrast setting, can be up 10x normal, even only stopped down one setting on a Rodenstock 150 f5.6. However, twenty years later, the thing works flawlessly. I wish Fred were still around. Anyway, I've been eyeing LED light sources with tremendous envy. I've downloaded a couple great designs and build instructions, but they all require basically throwing away the entire Zone IV system. If that's what it takes, so be it. The DIY LED designs are well within my electronic and fabrication skills, but I was just wondering if anyone out there has any experience with upgrading the Zone IV unit. If not, I'm about to put together a parts list for the new system. The system I have works beautifully, but the speed is costing me too much drinking time. Also, I'd appreciate anyone citing their preferred DIY designs for such a project.
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