What is the official throw ratio of the Optoma GT2100HDR?

The manufacturer-published throw ratio of the Optoma GT2100HDR is 0.5. Multiply your image width by that figure to get the exact throw distance.

What is the throw distance for the Optoma GT2100HDR on a 120-inch screen?

On a 120″ 16:9 screen the Optoma GT2100HDR needs about 4.4 ft from lens to screen, based on its 0.5 throw ratio.

What screen works best with the Optoma GT2100HDR?

The Optoma GT2100HDR works with a standard matte-white screen in a dark room, or an ALR screen if you watch with ambient light.

Is the Optoma GT2100HDR bright enough for a room with some light?

At 4,200 lumens the Optoma GT2100HDR holds up in a living room with some ambient light, especially on an ALR or CLR screen. For a fully bright room, dim what you can or use a high-gain ALR screen.

Is the Optoma GT2100HDR good for gaming?

Its input lag is around 16 ms, which is good for most gaming.

Optoma GT2100HDR: throw distance & specs

Quick answer

The Optoma GT2100HDR sits 3.6 ft from a 100″ screen and about 4.4 ft from a 120″ screen, set by its official 0.5 throw ratio. At 4,200 lumens it pairs best with a matte-white screen in the dark, or an ALR screen with some ambient light.

Throw ratio

0.5

Brightness

4,200 lumens

Resolution

4K UHD

Type

lamp

Specifications

Throw ratio	0.5
Brightness	4,200 lumens
Resolution	4K UHD
HDR	Yes
Light source	lamp
Type	Standard throw
Input lag	16 ms
Price	~$1,799

Check price →

Throw-distance calculator

Screen size (diagonal, inches)

Optoma GT2100HDR — distance for a 100″ screen

3.6 ft

Lens-to-screen distance. Zoom (if any) lets you fine-tune within the range.

Throw distance by screen size

How far the Optoma GT2100HDR sits from the screen at common 16:9 sizes, across its full zoom range.

Screen (16:9)	Image width	Throw distance
90″	78″	3.3 ft
100″	87″	3.6 ft
120″	105″	4.4 ft
150″	131″	5.4 ft

Every projector’s throw distance, by screen size: 100-inch screen · 120-inch screen

Which screen for the Optoma GT2100HDR?

The Optoma GT2100HDR is a standard-throw projector, so it works with a matte-white screen in a dark room or an ALR screen if you watch with some ambient light. Match the screen size to the throw distance the calculator gives for your room.

ALR (standard throw)

Elite Screens Aeon CineGrey 3D (AR100DHD3)

1.2 gain · 100″

ALR (standard throw)

Elite Screens Sable Frame CineGrey 3D (ER100DHD3)

1.2 gain · 100″

ALR (standard throw)

Elite Screens Aeon CineGrey 5D (AR103DHD5)

1.5 gain · 103″

Frequently asked questions

For a 100″ 16:9 screen the Optoma GT2100HDR needs about 3.6 ft from lens to screen, based on its 0.5 throw ratio. Use the calculator above for your exact screen size.

Compare with

vs

Optoma GT2100HDR vs BenQ HT3560

1.13–1.47 · 2,200 lm

vs

Optoma GT2100HDR vs BenQ TK710

1.15–1.5 · 3,200 lm

vs

Optoma GT2100HDR vs BenQ TK860i

1.13–1.47 · 3,300 lm

Guides for this projector

Guides

Short throw vs ultra-short-throw vs standard

The three types are set by throw ratio: ultra-short-throw (UST) is below 0.4 and sits inches from the wall; short throw is 0.4–1.0 and sits a few feet back; standard (long) throw is roughly 1.0–2.0 and sits across the room. For a 100-inch screen that is under 3 ft, about 3–7 ft, and 7–15 ft respectively.

Guides

Projector vs TV

A projector wins on sheer size and cost-per-inch — 100 to 200 inches for the price of a much smaller TV — but needs controlled light or an ALR screen. A TV wins on brightness, convenience and lifespan. For movie nights on a big screen, choose a projector; for all-day bright-room viewing, choose a TV.

Guides

True 4K vs pixel-shift 4K

Native 4K projectors put 8.3 million real pixels on screen; pixel-shift (XPR) projectors flash a 1080p or 2.7K chip 2-4 times per frame to approximate 4K. Native is slightly sharper on fine detail but costs much more; pixel-shift looks 4K to most eyes at normal viewing distance and covers nearly all affordable "4K" projectors.

Not sure it fits? Run your exact screen size through the calculator.

Back to top →

Updated October 19, 2026