Is the beam coming out of a typical DLP optical engine before the projection lens after the DMD/prisms meant to be parallel (collimated)? Kind of hard to tell because of unfocused beam and stray lights mixing together.
This is a question a hired freelance optical engineer was asking wanting to know if his custom projection lens can be positioned farther from the DMD/prisms. If the individual beams from the DMD micromirrors are parallel the answer I believe should be yes., they are parallel