Originally Posted by TzungILin
As many of you know that Optoma has been trying very hard to create good looking HT projectors, be it telecentric engine (the one that do lens shift) or non-telecentric engines.
Please forgive me my naive question, because I have zero optical engineering knowhow:
I want to know how the HD81 achieves to shift its projected image 77% from the lens center axis. Your post seems to suggest that the absence of a variable lens shift is due to the non-telecentric design. But after some research I found that the DWIN Transvision 3 uses a non-telecentric design as well, without a TIR prism, but still achieves a variable lens shift.
The purpose of my question is to know, whether in theory and in principle, by mechanically manipulating the relative optical axis of the projection lens within the HD81, one could achieve to reduce this 77% offset. As I said, in theory and in principle
If I would dare to try in practice, then I could destroy a first HD81 and then succeed on the second one, without having paid more than for a single PD Action 1080 with lens shift (but less contrast). So if I have only a 10% chance to succeed already with the first unit, then my net result is already a probabilistic saving
My 165" High Power screen and my liking of the HD81 lead me to these experimental thoughts of vandalism