At work I got the FA50/2.8 macro to have something AF for working in the darker warehouse area. But what I've seen, and it's not just a Pentax situation, when using it with the florescent lights for piece shots I get this blue dot in the middle of the image. Have yet to work with light placement to see if I can eliminate it. But from what I've been reading it has to do with multiple factors, one of which is the nature of the film coatings and the light interactions/reflections with the sensor surface. I only see the situation under the fl product lights. Anyone else here have similar issues when product shooting? If so, how did you resolve the situation?
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