Even if eShift is turned off in the projector's menu system, it will engage when you use the internal test patterns. There's nothing you can do about this. The best workaround I've found is to turn eShift off, turn the internal test pattern off, close down the aperture to its minimum manual setting, go right up to the screen, and use an externally-generated pattern (I use a solid green field) to focus the image. Using this method with my RS4910, I'm able to clearly make out individual pixels over the entire image (although they're slighly less sharp in the bottom corners of the screen). However, I do use a good deal of vertical lens shift and I'm almost at the minimum possible throw for my screen size, both of which would definitely account for the very slight defocusing I see at the absolute screen corners.