I am using Silverfast Ai with my 4990. Recently I have been noticing that all of my prescans have been coming out rather dark after resetting both the histogram and gradient adjustment windows. I have had to slide the midtones way, way to the left in the histogram to lighten the images enough for the scans to be even close to matching the chrome. The scanner does not have very many miles on it, but I am wondering if the bulb might be going? Some kind of pilot error? I recently recalibrated it using the target that I got with Ai. Not sure what else I can do.
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