Main trade-off
BenQ TK705i
It needs more throw distance, which can eliminate it from a shallow room.
Head-to-head
BenQ TK705i vs BenQ TK705STi: STi fits 120 inches from about 7 ft, i adjusts farther back
The short answer
Choose the TK705i for a shelf behind the sofa or any position that needs zoom adjustment. Choose the TK705STi when the lens must sit about seven feet from a 120-inch screen. Both have the same published brightness and 4K/60 latency. The room layout is the reason to switch.
Before you choose
The reasoning and the trade-offs
A ten-foot shelf rules out one full-width fit
At ten feet, the TK705i can make a 120-inch image optically. The fixed-lens STi makes roughly 172 inches from that position before digital reduction. Choose the TK705i if the shelf cannot move.
What this is based on
BenQ TK705i: 120-inch 16:9 width = 104.59 inches. Its 1.0 to 1.3 throw needs 8.72 to 11.33 feet. BenQ TK705STi: Fixed throw 0.8. At 120 inches distance, image diagonal = 120 / 0.8 × sqrt(337) / 16 = 172.13 inches.
Main trade-off
BenQ TK705STi
The fixed lens gives less freedom when a shelf or ceiling mount cannot move.
BenQ TK705i
- Choose it for
- Your shelf is nine to eleven feet from a 120-inch screen
- Optical zoom can keep the full picture while you adjust its size
- Main trade-off
- It needs more throw distance, which can eliminate it from a shallow room.
BenQ TK705STi
- Choose it for
- Your lens position is about seven feet from a 120-inch screen
- A short throw keeps the projector ahead of the sofa
- Main trade-off
- The fixed lens gives less freedom when a shelf or ceiling mount cannot move.
About this comparison
BenQ TK705i vs TK705STi for a real living room. Compare 120-inch placement, shelf flexibility, console response and the space needed around the seats.
Winner by situation
Start with what you need it to do
A fixed shelf ten feet from the screen
The TK705i reaches 120 inches optically here. The STi needs to move forward or shrink its larger picture digitally.
- BenQ TK705i
- Better fit
- BenQ TK705STi
- Caution
A shallow room with a seven-foot lens position
For the stated 120-inch target, the TK705i needs more distance. The STi is close to its required position.
- BenQ TK705i
- Not suitable
- BenQ TK705STi
- Better fit
A console game that runs at 60 frames per second
The same published 4K/60 lag gives no basis for declaring one faster.
- BenQ TK705i
- Similar
- BenQ TK705STi
- Similar
A PC game that must run above 60 Hz
Current manufacturer scan ranges conflict, and the listed timing tables do not resolve the required higher-refresh mode. Confirm it before purchase.
- BenQ TK705i
- Caution
- BenQ TK705STi
- Caution
What matters in practice
The differences that matter
A ten-foot shelf rules out one full-width fit
At ten feet, the TK705i can make a 120-inch image optically. The fixed-lens STi makes roughly 172 inches from that position before digital reduction. Choose the TK705i if the shelf cannot move.
How we reached this conclusion
BenQ TK705i: 120-inch 16:9 width = 104.59 inches. Its 1.0 to 1.3 throw needs 8.72 to 11.33 feet. BenQ TK705STi: Fixed throw 0.8. At 120 inches distance, image diagonal = 120 / 0.8 × sqrt(337) / 16 = 172.13 inches.
The short lens can move cables into the room
The STi saves about 1.7 feet against the TK705i at its shortest 120-inch placement. That can clear a shallow room, but it may put the power cable on a walking route. A front console or ceiling position is a better plan than trailing a lead across the family floor.
How we reached this conclusion
BenQ TK705i: Minimum 120-inch distance is 8.72 feet. BenQ TK705STi: 120-inch distance is 6.97 feet. Difference is 1.74 feet. Neither is battery-powered.
Buy the lens you need, not a gaming upgrade
Both publish 5 ms at 4K/60, so lens placement remains the main switch for that format. Their US specification pages and shared manual disagree on the broader scan range. If a source must run above 60 Hz, confirm the exact model and input timing before buying. Neither 120 Hz support nor an absolute 60 Hz ceiling is established.
How we reached this conclusion
BenQ TK705i: 5 ms at 4K/60. The US page lists 23 to 60 Hz, while the manual lists a 23 to 120 Hz scan range and timing tables only up to 60 Hz. Higher-refresh support remains unconfirmed. BenQ TK705STi: 5 ms at 4K/60. The US page lists 23 to 60 Hz, while the manual lists a 23 to 120 Hz scan range and timing tables only up to 60 Hz. Higher-refresh support remains unconfirmed.
Choice A
BenQ, TK705i
TK705i
A compact Google TV projector with optical zoom and a low-lag 4K/60 mode, aimed at a shared living-room movie and console setup.
- Best matched use
- Your shelf is nine to eleven feet from a 120-inch screen
Checked facts
- 120-inch lens distance: About 8.7 to 11.3 ft
- Resizing from one shelf: 1.3x optical zoom
- Console response: 5 ms at 4K/60, manufacturer claim
- Streaming and sound: Google TV and two 8W speakers
Choice B
BenQ, TK705STi
TK705STi
The short-lens TK705 puts Google TV and low-lag 4K gaming in a smaller room, provided the furniture can sit at its fixed throw distance.
- Best matched use
- Your lens position is about seven feet from a 120-inch screen
Checked facts
- 120-inch lens distance: About 7.0 ft
- Resizing from one shelf: Fixed lens
- Console response: 5 ms at 4K/60, manufacturer claim
- Streaming and sound: Google TV and two 8W speakers
Meaningful differences
What changes the fit
| What changes | BenQ TK705i | BenQ TK705STi | Why it matters |
|---|---|---|---|
| 120-inch lens distance | About 8.7 to 11.3 ft | About 7.0 ft | These are optical distances for a 16:9 image. Add room for the body, cables and ventilation. |
| Resizing from one shelf | 1.3x optical zoom | Fixed lens | The TK705i can change picture size without moving. Digital shrink on the STi uses less image area. |
| Console response | 5 ms at 4K/60, manufacturer claim | 5 ms at 4K/60, manufacturer claim | The short lens does not buy faster response. Neither is specified for 4K/120. |
| Streaming and sound | Google TV and two 8W speakers | Google TV and two 8W speakers | A separate streamer is unnecessary for supported built-in apps on either model. |
| Published brightness | 3,000 ANSI lumens | 3,000 ANSI lumens | The source rating does not settle calibrated picture quality or daytime contrast. |
What you give up
Every choice has a cost
If you choose BenQ TK705i
- There is no built-in battery for outdoor use away from an outlet.
If you choose BenQ TK705STi
- The US page lists 23 to 60 Hz, while the shared manual lists a 23 to 120 Hz scan range and input timing tables only up to 60 Hz. Higher-refresh support remains unconfirmed. Check the exact model and input mode before purchase.
Recommendation switch
The decision flips if...
Your shelf is nine to eleven feet from a 120-inch screen
Choose BenQ TK705i. Optical zoom can keep the full picture while you adjust its size
Your lens position is about seven feet from a 120-inch screen
Choose BenQ TK705STi. A short throw keeps the projector ahead of the sofa
What the facts say
What the comparison shows
Useful conclusions from the current home projectors comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| BenQ TK705i |
|
|
|
| BenQ TK705STi |
|
|
|
Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
BenQ TK705i
Your shelf is nine to eleven feet from a 120-inch screen
See price & reviews on AmazonBenQ TK705STi
Your lens position is about seven feet from a 120-inch screen
See price & reviews on AmazonLinks open in a new tab.