Optoma · 5,000–7,999 lumens · 4K
Optoma ZK551
5,100lumens
3840×2160native
1.4–2.24throw ratio
3.0 kgweight
The Optoma ZK551 is a DLP x 1 projector rated at 5,100 lumens with a native resolution of 3840×2160. It uses a laser phosphor light source rated for 30,000 hours. Its lens has a throw ratio of 1.4–2.24:1. Released August 2025.
Throw distance table
Distance from lens to surface for each image width (16:9 (4K HD)). Calculated as throw ratio × width; check the manufacturer's lens calculator before installation.
| Image width | Height | Standard lens 1.4–2.24:1 |
|---|---|---|
| 2 m (6.6 ft) | 1.12 m | 2.8–4.5 m |
| 3 m (9.8 ft) | 1.69 m | 4.2–6.7 m |
| 4 m (13.1 ft) | 2.25 m | 5.6–9.0 m |
| 5 m (16.4 ft) | 2.81 m | 7.0–11.2 m |
| 6 m (19.7 ft) | 3.38 m | 8.4–13.4 m |
| 8 m (26.2 ft) | 4.5 m | 11.2–17.9 m |
| 10 m (32.8 ft) | 5.62 m | 14.0–22.4 m |
| 12 m (39.4 ft) | 6.75 m | 16.8–26.9 m |
| 15 m (49.2 ft) | 8.44 m | 21.0–33.6 m |
| 20 m (65.6 ft) | 11.25 m | 28.0–44.8 m |
| 25 m (82.0 ft) | 14.06 m | 35.0–56.0 m |
| 30 m (98.4 ft) | 16.88 m | 42.0–67.2 m |
Open in the throw-distance calculator →
Maximum image size for projection mapping
Largest image that keeps a 10:1 contrast against ambient light on a light, matte surface (80% optical efficiency). See how this is calculated.
| Ambient light | Max area | Max width × height |
|---|---|---|
| Dark rural site (1 lux) | 453 m² | 28.4 × 16.0 m |
| Quiet street at night (5 lux) | 91 m² | 12.7 × 7.1 m |
| Lit city square (15 lux) | 30 m² | 7.3 × 4.1 m |
| Bright urban area (30 lux) | 15 m² | 5.2 × 2.9 m |
| Indoor, lights dimmed (50 lux) | 9 m² | 4.0 × 2.3 m |
Full specifications
| 3D Modes | Full HD 3D |
|---|---|
| Aspect Ratio | 16:9 (4K HD) |
| Audible Noise | 30 dB / 28 dB (Eco) |
| Best Used For | Higher Education House of Worship Corporate/Business |
| Brightness | 5,100 Lumens (ISO) 2 |
| Color Processing | 10-bit |
| Connection Panel | 12-Volt Trigger Audio Out: Mini Jack HDMI 2.0 x 2 Network: RJ-45 RS232: DB-9pin USB: A x 2 |
| Data Modes | MAX 3840x2160 |
| Digital Keystone | Horizontal & Vertical |
| Digital Zoom | Yes |
| Display Type | DLP x 1 |
| Features | 24/7 Operation Full HD 3D Geometric Correction Miracast HDMI CEC Crestron RoomView™ |
| Image Size | 19.67" - 300.05" |
| Included Lens | 1.6x manual zoom , manual focus |
| Internal Speakers | 15.0 Watts Mono |
| Lens Shift | Vertical +15% |
| Light Source | Laser Phosphor |
| Light Source Life | 30,000 hours |
| MSRP | n/a |
| Power | 245 Watts 100V - 240V |
| Projector Placement | For a " diagonal screen, place the projector lens between 10'-2" and 16'-3" from the screen. |
| Projector Size | 4.25" x 10.79" x 8.50" (HxWxD) |
| Released | August 2025 |
| Resolution | 3840x2160 |
| Status | Shipping |
| Street Price | $2,099 (USD) |
| Throw Distance | 3.2' - 30.5' Calculate Throw Distance |
| Throw Ratio | 1.40:1 - 2.24:1 (D:W) |
| Video Modes | 720p, 1080i, 1080p/60 |
| Weight | 6.6 lbs |
Specifications compiled from ProjectorCentral and manufacturer data. Prices change — verify with dealers.
Similar projectors
| Model | Lumens | Resolution | Light source | Throw ratio | Street price |
|---|---|---|---|---|---|
| Optoma HCPro-4400 | 5,000 | 3840×2160 | Laser Phosphor | 1.2–1.92:1 | $5,436 |
| Optoma HCPro-5400 | 5,000 | 3840×2160 | RGB Laser | 1.25–2.0:1 | $7,999 |
| Optoma UHZ5000 | 5,000 | 3840×2160 | Laser Phosphor | 1.2–1.92:1 | |
| Optoma ZK521ST | 5,000 | 3840×2160 | Laser Phosphor | 0.79:1 | $2,699 |
| Optoma ZK521ST-B | 5,000 | 3840×2160 | Laser Phosphor | 0.79:1 | $2,699 |
| BenQ LK936ST | 5,100 | 3840×2160 | Laser Phosphor | 0.81–0.89:1 | $4,899 |
| Panasonic PT-FRQ50BU7 | 5,200 | 3840×2160 | Laser Phosphor | 1.45–2.92:1 | $3,833 |
| Panasonic PT-FRQ50WU7 | 5,200 | 3840×2160 | Laser Phosphor | 1.45–2.92:1 | $4,299 |