Question 1

how big of area can it project without affecting the quality of the picture ?

Accepted Answer

We have a 11' x 6.5' screen with the projector at about 20'.  The picture is clear however the room can be fairly bright and the further out the projector is the dimmer the picture gets.  This is the only issue.  If you have good shades/blinds this wouldn't matter.  We have high windows without any shades or blinds.

Question 2

What is the contrast ratio for this unit?

Accepted Answer

The paper work says it's a 15,000 to 1 contrast ratio.  I use mine almost every night on an old 8' pull down screen, and the screen has never looked better. I use it for br & dvd play back (with surround sound system{built in speaker as on all projectors sucks}) and I am quite satisfied with what I get. I haven't tried the 3D yet. so I don't know how well that works yet. But for the price it is, there is no complaints.

Question 3

I have a small room. What is the closest focus range ?

Accepted Answer

According to the specs the minimal distance to screen(throw distance) is 3.9ft. At that distance the picture size would only be 30 inches.  So I would recommend being 4 feet or further away.

If you want to have a projector that close, I would recommend at short throw projector as you will have a much larger image that is able to be focused at a much closer distance than this model.

Brand	InFocus
Model	IN118HDa

Cabinet Color	Black
Type	DLP

Lamp	Number of Lamps:1
Aspect Ratio	16:9
Native Resolution	1920 x 1080
Brightness	3000 lumens Normal Mode (2800 lumens Low Power)

Compatibility	Video Compatibility: SDTV (NTSC, PAL, SECAM, 480i, 576i), ED/HDTV (480p, 576p, 720p, 1080i, 1080p) 3D: Supports 3D content from Blu-ray, cable boxes, dish services and more (over HDMI) at 144Hz and PC-based 3D content at 120Hz. DLP Link 3D glasses required.
Built-in Speakers	2 W mono

Dimensions (H x W x D)	8.70" x 11.50" x 4.30"
Weight	5.40 lbs.

InFocus IN118HDa 1920x1080 FHD 3000 ANSI Lumens, HDMI 1.4 / Dual VGA Inputs, Built-in Speaker, Audio Pass-through, 3D Ready DLP Projector

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Item#: N82E16824140176