I know that JVC projectors have a sealed light path. Just wondering if that completely rules out dust blobs or minimizes the chances of getting them a good bit. Have not read about anyone getting them on JVC projectors but just curious.
The JVCs don't exactly have a sealed light path. There is still a filter that must be cleaned occasionally. That said, the design makes it very unlikely for dust to be an issue. I have heard of one or two cases of dust getting into the light engine but those cases were described as dealing with defective components, so I don't they involved design issues. I don't worry about dust at all.
You can have a major booger on the exterior of the lens and it won't affect PQ because it's not in the focus plane of the projector. Might impact light output somewhat, but I doubt you could see it onscreen. In any case, assuming a high quality glass lens you can clean it like any other fine optics i.e. lens cleaning fluid and tissue.
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