So, I just got my replacement V850, the other two Epson sent had dirt on the inside of the glass. This one does, but not in image area. Any, I am trying to calibrate the focus using the Better Scanning set up again only this time, I have run the range of 0 adj all the way out to 3 or 4 full turns and the image doesn't seem to get better or worse. In fact, in Vuescan, the preview images look great, but the image after scan looks like crap and when I open in PS, looks like crap. What I am I doing wrong? The slide is absolutely focused tack sharp over the entire depth of field.