The difference that matters
The Optoma ZK608TST is brighter (6,000 lumens against 5,100). The Optoma ZK608TST throws a given image from closer (ratio 0.58 against 0.8). The BenQ LK936ST costs $1,960 less at the prices we observed.
Side by side
| Specification | BenQ LK936ST | Optoma ZK608TST |
|---|---|---|
| Brightness | 5,100 lm | 6,000 lm |
| Resolution | 4K UHD (3840 × 2160) | 4K UHD (3840 × 2160) |
| Native aspect | 16:9 | 16:9 |
| Throw ratio | 0.8–1.1:1 | 0.58:1 |
| Distance for a 10.5 × 8 ft 4:3 screen | 11′ 2″ | 8′ 1″ |
| Brightness on that screen | 46 fL | 54 fL |
| Light source | Laser | Laser |
| Rated life | 20,000 h | 30,000 h |
| Zoom | 1.3× | — |
| Lens shift | — | Vertical −106% to +116%; horizontal ±4% |
| Input lag | About 17 ms (1080p game mode) | — |
| Price seen | $4,899 | $6,859 |
Highlighted rows differ. Figures come from each product's sources; room depth, distances and brightness are FOREference calculations using the same method for both.
Which should you choose?
Optoma ZK608TST
Choose the Optoma ZK608TST if your room has ambient light or a large screen or you need to mount it close to the screen.
Before you buy either
- Check the room: room size calculator and ceiling height calculator.
- Confirm what each seller includes — accessories, software trials and bundles change often.
- Read the limitations on each full reference page.
FOREference compares published specifications; we have not tested these products side by side. How we work · Disclosure