Originally Posted by Cowboys
Reading this and the Benq W1070 user menu to mount my pj for a 110" 16:9 diagonal is even more confusion. Based on your calculation method for my 110" diagonal screen, the center of the pj Len needs to be 5.5" (5x1.1)above top of my screen for the optimal/no Len shift position. But in the Benq user menu, it says the lowest/highest len position for my screen size is 68mm which equal 2.68". Allow me to ask one last time: How high above my 110" 16:9 screen does the W1070 center Len needs to be for optimal/no Len shift position. Thanks so much. My W1070 should be here next week.
I believe you had it right, about 5.5" or so.
We went through this earlier in the thread, I forget now, but the Benq manual in this case appeared to be describing the MIN offset for a 16:9 screen on that page (about 2.5" for 100" screen)...
The center of the max/min should be where you want the lens shift. The wording in the manual is somewhat contradictory.
Look at the specs page below, it says Projector Offset = Vertical 110%-130%±5%
It appears you have to divide that by 2, so you are left with 5% of screen height to 15% of screen height. Now that is based on the data I have, if an owner wants to measure it and show me otherwise, that's fine.
That is one reason interpreting manuals is problematic, sometimes they divide it ahead of time and sometimes they don't. Lens shift is sometimes described incorrectly or poorly in manuals and diagrams.Edited by coderguy - 6/12/13 at 8:14am