Originally Posted by Archibald1
The manual states and common sense suggests that the projector unit should be level and that lens shift should be used as much as possible to line the screen up.
Any sort of tilt on the unit will mean having to use keystone, which while versatile, is not ideal. It introduces extra picture processing for example and can mean that native pixel mapping is no longer taking place and therefore should be used as minimally as possible.
In your case tilting it down more will result in an even more trapezoidal shape to the picture.
Looking at the picture of your installation, use a spirit level to check your projector is level as the ceiling may not be completely level either.
Ideally the centre of the projector lens would line up with the centre of the screen but as that is mostly impractical in everyday scenarios, that is why lens shift is such a boon.
Just take your time with it and you will get there in the end.
Again thank you very much for all your insight, it really helps me understand where the issue might come from.
It definitely makes sense to me that the centre of the projector should ideally line up with the centre of the screen and that you should only rely on lens shift to correct the projection (vs. physically tilting the unit).
As far as I know, they removed the keystone correction feature from the HW65, but even so, I understand you argument why it should be avoided (which is probably why they removed it altogether).
I will use a spirit level to check whether the projector is leveled, although just by looking at it, it definitely seems to be tilted downwards on the front end (which fits your explanation regarding the trapezoidal shape of the projection). Also, very good point on the ceiling maybe not being leveled, I would have definitely missed that
Following this line of though, what if the wall (on which the image is being projected) is not straight? Could this also create a trapezoidal shape or impact the shape of the projection in any way?
In any case, I will try to level the projector and see if this fixes the trapezoidal projection. Once the distortion is solved, I will see if I can still align the projection with the screen.
I fear however that I will require a different - lower - mount, (if I level the unit upwards) as I'm already using the full lens shift to fit with the lower border of the screen.
Anyway, cheers for the quick and informative replies, much appreciated