Can this projector throw the image at an angle? From a corner of the room.

Sounds like you need something like an Ultra-Short throw projector. LG, Epson and Optoma make some that sit right up against the screen on a table and yet show a nice 110" picture.

How do you flip the image? When I mounted it to the ceiling the image is upside down.

from the remote, hit "menu", then go to the "setup tab" (hit left twice to go there"), go to the "projection" item, and then selec the option showing the projector upside down.

will this projector work with passive 3d glasses, or do you have to use the active type of 3D glasses?

This projector has a VESA port if you want to connect an external RF 3D signal emitter.It will work with DLP Link or Active 3D glasses.There are glasses out there that will work with either technology.There's a good reason you have a VESA port.The experts know with an external 3D emitter and Active 3D glasses you get a MUCH better 3D experience.I couldn't believe the difference when I first saw it.Make sure you get a Blueray player that will allow you to adjust how strong the 3D is.

How does this compare to the viewsonic pjd5134? i am not sure which features are the most important to compare.

The Optoma HD141X is full HD projector. The Viewsonic PJD5134 only has a "native resolution" of 800x600. In my opinion Optoma HD141X is better projector than the Viewsonic PJD5134.

Brand Name	Optoma
Item Weight	5.4 pounds
Product Dimensions	8.8 x 12.4 x 4 inches
Item model number	HD141X
Batteries	2 AAA batteries required.
Is Discontinued By Manufacturer	No
Output Wattage	10
Color Name	Black
Special Features	speakers
Item display height	114 centimeters

Optoma HD141X

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