ViewSonic LS740-4K: Specs, Throw Distance & Alternatives
A compact 4K laser phosphor DLP projector built for installation-style use. ViewSonic rates it at 5,000 ANSI lumens, with a 1.6x manual zoom and a 1.4–2.24:1 throw ratio. It has no lens shift, no smart TV system and no built-in wireless, and ViewSonic lists 4.2 ms input lag without stating the mode.
Is the ViewSonic LS740-4K right for you?
Good for
- Bright rooms: 5,000 ANSI lumens rated
- Placement help: a 1.6x manual zoom plus ±30° keystone and four-corner correction
- Light to mount: 6.8 lb, with ceiling installation supported
- Two HDMI 2.0 inputs and RS-232 and RJ45 control
What to plan for
- No smart TV system and no built-in wireless listed: add a streaming stick (the USB-A port supplies 5 V / 1.5 A)
- The 4.2 ms lag rating does not state its mode, and no 4K/60 lag figure is published
- No lens shift, so the mount or table height has to be right
- A single 15 W mono speaker and 3.5 mm audio out, with no ARC listed
- HDR support is not confirmed by ViewSonic
Based on manufacturer specifications and published reviews (sources below). We don't do hands-on testing.
ViewSonic LS740-4K specs
| Resolution | 4K UHD (3840 × 2160, DLP) |
|---|---|
| Brightness | 5,000 ANSI lumens (ViewSonic rating) |
| Display technology | DLP |
| Light source | Laser phosphor |
| Light source life | 20,000 hours |
| Contrast ratio | 3,000,000:1 dynamic (ViewSonic rating) |
| Throw ratio | 1.4-2.24:1 |
| Lens shift | None |
| Max refresh rate | 240 Hz |
| HDMI ports | 2 (HDMI 2.0) |
| Speakers | 15 W |
| Weight | 6.83 lb |
How far from the screen?
Lens-to-screen distance for a 16:9 image, calculated from its 1.4-2.24:1 throw ratio. The zoom lets you place it anywhere in the range.
| Screen | Closest | Farthest |
|---|---|---|
| 80″ | 8' 2" | 13' 0" |
| 100″ | 10' 2" | 16' 3" |
| 120″ | 12' 2" | 19' 6" |
| 150″ | 15' 3" | 24' 5" |
ViewSonic LS740-4K input lag by mode
| Signal | Input lag |
|---|---|
| Mode not stated (ViewSonic rating) | 4.2 ms |
Source: ViewSonic’s published rating; the mode is not stated and no independent measurement is listed. Because these are upper limits and not measurements, we don't rank it against other models. Compare measured and rated figures in the input lag database.
ViewSonic LS740-4K alternatives at a similar price
In-stock 4K projectors priced closest to it on Amazon today.
| Model | Price today | Amazon rating | Compare |
|---|---|---|---|
| ViewSonic LS740-4K (this one) | $1,796 | — | — |
| BenQ X3100i True 4K UHD 4LED Gaming Projector | $1,799 | 3.6★ | — |
| BenQ TK710 4K Laser 3200 Lumens Movie and Gaming Projector w | $1,799 | 4.4★ | — |
| Optoma 4K400STx 4K Ultra HD High Brightness Short Throw DLP | $1,807 | 2.9★ | — |
| BenQ TK700STi 4K HDR Short Throw Gaming Projector | $1,899 | — | — |
Where it fits
ViewSonic LS740-4K FAQ
- How far from the screen should the ViewSonic LS740-4K be for a 100-inch image?
- Between 10' 2" and 16' 3" from lens to screen, depending on the zoom setting (throw ratio 1.4-2.24:1).
- What is the input lag of the ViewSonic LS740-4K?
- Mode not stated (ViewSonic rating): 4.2 ms. Source: ViewSonic’s published rating; the mode is not stated and no independent measurement is listed.
- Does the ViewSonic LS740-4K have lens shift?
- No. ViewSonic states that lens shift is not supported, so the image position is set by where the projector sits. It has a 1.6x manual zoom.
Sources
Price, stock and rating come from Amazon and update automatically (last checked Nov 14, 2026, 10:00 PM).
Disclosure: As an Amazon Associate we earn from qualifying purchases. We also participate in the eBay Partner Network. We may earn a commission when you click through an affiliate link and make a purchase, at no extra cost to you. Prices and availability shown are accurate as of the time posted but are subject to change. Any price and availability information displayed at the time of purchase will apply.