Optoma GT3900UHD vs ViewSonic PX749-4K
Two of the home theater projectors in our best home theater projectors comparison, lined up spec by spec. Every figure comes from the manufacturer pages linked below, and the scores use the same published formula as the full ranking.
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Best for: 4K UHD short-throw laser with 4,000 ISO lumens and a 0.49 throw
Check price at AmazonBest for: 4,000 ANSI-lumen 4K projector with a 1.3x optical zoom
Check price at AmazonSpec-by-spec comparison
Green marks the better published figure. "Not listed" means the manufacturer doesn't publish it.
| Spec | Optoma GT3900UHD | ViewSonic PX749-4K | Weight |
|---|---|---|---|
| Brightness (ISO or ANSI)White brightness the maker labels ISO 21118 or ANSI. Unlabelled or peak figures are quoted, not scored. Missing values take the category minimum. | 4000 lm | 4000 lm | 28% |
| Resolution classFour classes (computed) from the maker's resolution label: native 4K (including SXRD and D-ILA), 4K UHD including pixel-shift / 4K PRO-UHD, 1080p, and HD / WXGA. | 4K UHD class, including pixel-shift (computed) | 4K UHD class, including pixel-shift (computed) | 22% |
| Light-source lifeThe longest light-source life the maker lists, usually an Eco or laser rating. Missing values take the category minimum. | 30000 h | Not listed | 12% |
| Optical zoomOptical zoom ratio from the official sheet. Digital-only zoom is shown as Not listed and is not scored. Missing values take the category minimum. | Not listed | 1.3 × | 12% |
| Lens shiftYes only when the maker lists lens shift. Unstated counts as no. | No | No | 10% |
| HDRYes when the maker lists HDR10, HLG, HDR10+ and/or Dolby Vision. Unstated counts as no. | Yes | Yes | 16% |
| Brightness (maker) | 4,000 ISO lumens (Optoma footnotes that brightness is measured to ISO 21118) | 4,000 ANSI lumens | info |
| Resolution (maker) | True 4K UHD (3840 × 2160) | 4K UHD | info |
| Resolution class | 4K UHD class, including pixel-shift (computed) | 4K UHD class, including pixel-shift (computed) | info |
| Light source life (maker) | 30,000 hours (Laser, up to 30,000 hours) | Not listed | info |
| Throw ratio (maker) | 0.496 (short throw, not ultra-short) | 1.13–1.47 | info |
| Optical zoom | Fixed short-throw lens (no optical zoom listed) | 1.3× optical | info |
| Lens shift | Not listed | Not listed | info |
| HDR (maker) | HDR10 and HLG | HDR listed | info |
| Light source | Laser | Not clearly labelled as lamp or laser on the text we captured | info |
| Input lag (maker) | As low as 4.3 ms at 1080p/240 Hz | Not listed | info |
| Note | Short throw, not ultra-short throw | Not listed | info |
| BeamPick score | 5.2/10 | 4.2/10 | 100% |
Where each one comes out ahead
Optoma GT3900UHD
No scored spec where it is strictly ahead; its case rests on the strengths below.
What we like
Watch out for
- Optical zoom not published by Optoma
ViewSonic PX749-4K
No scored spec where it is strictly ahead; its case rests on the strengths below.
What we like
Watch out for
- Light-source life not published by ViewSonic
Verdict
Two bright 4K short-to-standard-throw living-room projectors. Optoma labels 4,000 ISO lumens and a 0.496 short-throw ratio with 30,000-hour life; ViewSonic lists 4,000 ANSI lumens, 1.3× zoom and a 10 W speaker. Optoma's short throw is not ultra-short throw.
- Optoma GT3900UHD: Optoma: GT3900UHD
- ViewSonic PX749-4K: ViewSonic: PX749-4K