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ViewSonic PX748-4K vs Optoma UHD35
Budget 4K gaming projectors — which should you buy?
Two lamp-based single-chip DLP projectors chasing the same buyer: 4K gaming on a budget. One of them tracks at $549.99, the other at $1,299 — and the cheaper one has the faster stated lag.
Reading the numbers honestly
Both input-lag figures are stated, and the comparison is stark: 4.2 ms (ViewSonic) vs 16.7 ms (Optoma) at 4K60. A stated 4.2 ms is genuinely elite — monitor-class — and it belongs to the cheaper unit, alongside a higher claimed brightness (4,000 vs 3,600 lumens). On running costs we can only be partly honest: both use UHP lamps; the ViewSonic states a 4,000-hour lamp life while the Optoma's lamp life is UNSTATED in our data, and NEITHER lists a replacement-lamp price — so we decline to do lamp-economics math that the sheets don't support.
Specifications · side by side · per-field provenance● SOURCE-TRACKED
| Spec | ViewSonic PX748-4K | Optoma UHD35 |
|---|
| Price | $550 | $1,299 |
| Brand | ViewSonic | Optoma |
| Technology | DLP 1chip | DLP 1chip |
| Native Resolution | 4K pixel shift | 4K pixel shift |
| Brightness Lumens | 4000 | 3600 |
| Contrast Ratio Dynamic | 12,000:1 | not stated |
| HDR Support | HDR, HLG | HDR10, HLG |
| Light Source Type | lamp UHP | lamp UHP |
| Lamp Life Normal Hrs | 4000 | not stated |
| Throw Ratio Min | 1.13 | 1.5 |
| Throw Ratio Max | 1.47 | 1.66 |
| Throw Type | standard | standard |
| Optical Zoom Range | 1.3x optical zoom | 1.1x |
| Native Aspect Ratio | 16:9 | 16:9 |
| Keystone Vertical | Yes | Yes |
| Four Corner Correction | Yes | Yes |
| Input Lag Ms 4k60 | 4.2 | 16.7 |
| HDMI Inputs | 2 | 2 |
| HDMI Version | 2.0 | 2.0 |
| Rs232 Port | Yes | Yes |
| Trigger 12v | Yes | Yes |
| Width Inches | 12.2 | 12.4 |
| Height Inches | 8.7 | 4.6 |
| Depth Inches | 4.3 | 10.6 |
| Weight Lbs | 6.2 | 8.6 |
| Power Consumption W | 310 | 300 |
| Contrast Ratio Native | not stated | 1,000,000:1 |
| Powered Zoom | not stated | No |
| Orientations Supported | not stated | front, rear, ceiling mount, table top |
| Noise DB Normal | not stated | 26 |
Shaded rows differ · green dot = lab-measured · amber = manufacturer-verified · blue = retailer/community-reported · grey = estimated · “not stated” means exactly that
The verdict
Buy the ViewSonic PX748-4K — it beats the Optoma UHD35 on every stated spec that differs (4.2 vs 16.7 ms lag, 4,000 vs 3,600 claimed lumens, a stated lamp life vs an unstated one) at 42% of the tracked price. We can find no spec field in our data where the Optoma's extra $749 shows up.
GamingViewSonic PX748-4K — A stated 4.2 ms at 4K60 — elite even among monitors, let alone projectors.
Any budget-conscious buildViewSonic PX748-4K — $549.99 vs $1,299 tracked with the better stated sheet.
What our normalized data addsNOT ON THE SPEC SHEETS
- Both 4K60 input lags are STATED — 4.2 vs 16.7 ms — and the monitor-class number belongs to the $549.99 unit; our per-model lag field is data most comparison pages don't have.
- Lamp-economics honesty: both are UHP-lamp designs; ViewSonic states a 4,000-hour life, the Optoma's is UNSTATED, and neither publishes a replacement-lamp cost — so we state the inputs and refuse the fabricated total-cost math.
- 4,000 vs 3,600 claimed lumens and a $549.99 vs $1,299 tracked price — the spec sheet and the price tag point in opposite directions.
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