The lack of focus is definitely most visible with the HTPC, but is visible on other sources. I have a DVDO Edge in line between the sources and the HD8600 and have noticed the lack of focus with the test patterns for the Edge (and that's where the shift in blue is most visible). I did try my stand alone blu-ray player and also tried taking the Edge out of the chain and that didn't affect the focus or the shift in blue. I did spend a lot of time last weekend working on the physical configuration of the projector (lots of time with the laser level and drawing arcs in the ceiling
) but it didn't improve the focus that much. FWIW I called Optoma about the problem and talked to someone called Mike. Mike's explanation was that this is not unexpected and as long as the lack of focus and the blue shift was not visible while watching content there was no problem ("just like the edges of the screen are darker than the middle, it's easier to focus in the middle of the screen than the edges"). I found that to be a fairly disappointing response for a $8,000 (when new just a couple of years back) projector.
I was also able to use a fairly inexpensive Epson LCD projector to confirm that the lack of focus and blue shift was not being caused by the source material or other components in the chain. Of course, with the Epson the SDE was incredibly visible. I know the HD8600 has the small TI chip. Does anyone know which of the below-$10,000 single-chip, DLP projectors use the 0.95" chip? I believe the LS-3, LS-5, and Sharp XV-Z20000 use that chip but was wondering which other projectors use the larger chip?