The difference that matters
The Optoma ZH400ST throws a given image from closer (ratio 0.5 against 0.69). The Optoma ZH400ST uses a laser light source; the other uses a lamp. The Optoma ZH400ST costs $290 less at the prices we observed.
Side by side
| Specification | BenQ AH500ST | Optoma ZH400ST |
|---|---|---|
| Brightness | 4,000 lm | 4,000 lm |
| Resolution | Full HD 1080p (1920 × 1080) | Full HD 1080p (1920 × 1080) |
| Native aspect | 16:9 | 16:9 |
| Throw ratio | 0.69–0.83:1 | 0.5:1 |
| Distance for a 10.5 × 8 ft 4:3 screen | 9′ 8″ | 7′ |
| Brightness on that screen | 36 fL | 36 fL |
| Light source | Lamp | Laser |
| Rated life | 15,000 h | 30,000 h |
| Zoom | 1.2× | Fixed |
| Lens shift | — | — |
| Input lag | About 16 ms (fast mode) | — |
| Price seen | $1,999 | $1,709 |
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?
BenQ AH500ST
Choose the BenQ AH500ST if you prefer its maker, seller or ecosystem — the published figures do not favour it.
Optoma ZH400ST
Choose the Optoma ZH400ST if you need to mount it close to the screen or you want no lamp replacements.
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