Optoma GT2100HDR vs BenQ TH671ST
Optoma GT2100HDR (#3) vs BenQ TH671ST (#5): in our Projectors for Golf Simulators scoring the Optoma GT2100HDR totals 8.9/10 and the BenQ TH671ST 8.2/10, the Optoma GT2100HDR leading on Reliability & Maintenance and Image Brightness & Quality and the BenQ TH671ST on Throw & Mounting Flexibility.
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TopsFive comparison scores
Side by side
| Optoma GT2100HDR | BenQ TH671ST | |
|---|---|---|
| Price | $1027.64 | $949 |
| Resolution | 1080p Full HD (4K HDR input) | 1080p Full HD |
| Rated Brightness | 4,200 lumens | 3,000 ANSI lumens |
| Throw Ratio | 0.496:1 (fixed short throw) | 0.69–0.83:1 (short throw) |
| Lowest Input Lag | 8.6 ms (1080p/120Hz) | 16.7 ms (1080p/60Hz) |
| Light Source | DuraCore laser | Lamp (DLP) |
| Light Source Life | 30,000 hours | 4,000–15,000 hours (LampSave) |
| Zoom & Adjustment | Fixed lens, digital keystone | 1.2x optical zoom, auto vertical keystone |
| 100" Image From | About 3.6 ft | About 4.9 ft |
How they differ in real use
Built from our projectors for golf simulators scoring, each product's published specifications, and verified owner feedback — not hands-on testing.
Both the Optoma GT2100HDR and the BenQ TH671ST made our Top 5 Projectors for Golf Simulators, at #3 and #5. The proven mid-tier pick — Golfstead's 2026 guide ranks it the #1 golf simulator projector, and it delivers the same 4,200-lumen laser, 0.496:1 throw, and IP6X dust sealing as the GT2400HDR for less money. It sits below its successor only because the GT2400HDR adds a golf-specific picture mode and Amazon first-party availability for a modest premium, and it clearly beats the GT2000HDR below it on the 20% brightness advantage that matters most on an impact screen. The most proven projector in home golf simulation — sim specialists from Carl's Place to Rapsodo have packaged it for years, and its 1.2x zoom makes placement more forgiving than any fixed-lens Optoma. It ranks last in 2026 on hardware economics alone: its lamp dims with age and lacks dust sealing, and at its current Amazon price it costs more than the brighter, laser-based GT2000HDR. Choose it for the track record and zoom flexibility, not the spec sheet.
We score projectors for golf simulators on Image Brightness & Quality (30%), Input Lag (20%), Throw & Mounting Flexibility (20%), Reliability & Maintenance (15%) and Value (15%). On that basis the Optoma GT2100HDR totals 8.9 out of 10 and the BenQ TH671ST 8.2. The widest gap is Reliability & Maintenance, where the Optoma GT2100HDR scores 9 against 7.2 for the BenQ TH671ST — light source life and dust protection in garage bays. Image Brightness & Quality also separates them: 8.8 for the Optoma GT2100HDR versus 8 for the BenQ TH671ST. The BenQ TH671ST claws back ground on Throw & Mounting Flexibility.
On paper, the specifications that actually differ: Resolution — 1080p Full HD (4K HDR input) on the Optoma GT2100HDR versus 1080p Full HD on the BenQ TH671ST; Rated Brightness — 4,200 lumens on the Optoma GT2100HDR versus 3,000 ANSI lumens on the BenQ TH671ST; Throw Ratio — 0.496:1 (fixed short throw) on the Optoma GT2100HDR versus 0.69–0.83:1 (short throw) on the BenQ TH671ST; Lowest Input Lag — 8.6 ms (1080p/120Hz) on the Optoma GT2100HDR versus 16.7 ms (1080p/60Hz) on the BenQ TH671ST; Light Source — DuraCore laser on the Optoma GT2100HDR versus Lamp (DLP) on the BenQ TH671ST; Light Source Life — 30,000 hours on the Optoma GT2100HDR versus 4,000–15,000 hours (LampSave) on the BenQ TH671ST.
Pricing as of July 18, 2026: $1,027.64 for the Optoma GT2100HDR and $949 for the BenQ TH671ST, a $78.64 difference in the BenQ TH671ST's favor. Owners praise the Optoma GT2100HDR for same 4,200-lumen laser output and 0.496:1 throw as the newer GT2400HDR, usually at a lower price and proven pick with an established track record in the golf-sim community — Golfstead's 2026 guide ranks it #1 overall; the most common complaint is amazon stock comes from third-party sellers rather than Amazon or Optoma directly, so price and availability fluctuate. Owners praise the BenQ TH671ST for the most proven projector in home golf simulation, with years of owner installs and setup guides from Carl's Place, Rapsodo, and other sim specialists and 1.2x optical zoom and auto vertical keystone make placement more forgiving than any fixed-lens Optoma; the most common complaint is lamp light source dims over time and eventually needs replacement (rated 4,000 hours in normal mode, up to 15,000 in LampSave) — every laser pick here is rated 20,000-30,000 hours.
Optoma GT2100HDR
- Same 4,200-lumen laser output and 0.496:1 throw as the newer GT2400HDR, usually at a lower price
- Proven pick with an established track record in the golf-sim community — Golfstead's 2026 guide ranks it #1 overall
- 8.6 ms input lag (1080p/120Hz) keeps GSPro and E6 ball flight feeling instantaneous
- IP6X dust protection and a 30,000-hour maintenance-free laser fit garage environments
- Amazon stock comes from third-party sellers rather than Amazon or Optoma directly, so price and availability fluctuate
- No golf-specific picture mode — the GT2400HDR adds that tuning for roughly $170 more
- Fixed lens, 1080p resolution, and no optical zoom (the same trade-offs as the rest of the GT line)
BenQ TH671ST
- The most proven projector in home golf simulation, with years of owner installs and setup guides from Carl's Place, Rapsodo, and other sim specialists
- 1.2x optical zoom and auto vertical keystone make placement more forgiving than any fixed-lens Optoma
- 16.7 ms input lag and a dedicated low-latency game mode keep simulator response crisp
- Dual HDMI inputs and a built-in 5W speaker simplify simple one-cable setups
- Lamp light source dims over time and eventually needs replacement (rated 4,000 hours in normal mode, up to 15,000 in LampSave) — every laser pick here is rated 20,000-30,000 hours
- At around $949 on Amazon it currently costs more than the brighter, laser-based Optoma GT2000HDR
- No dust sealing, which matters in garage bays where turf infill and dust circulate
Which should you buy?
The Optoma GT2100HDR is the better fit for builders who want Optoma's full 4,200-lumen laser platform at the lowest price and buyers who prefer a model with an established owner track record — it is the higher-scoring pick here, chiefly for Reliability & Maintenance and Image Brightness & Quality. The BenQ TH671ST is the better fit for buyers who want the most documented, widely-supported entry sim projector and installs that need zoom flexibility on a budget, and the stronger choice if Throw & Mounting Flexibility matters more to you than the overall score. If the $78.64 saving matters more than Reliability & Maintenance, the BenQ TH671ST is the better value. The Optoma GT2100HDR is a poor fit for buyers who want first-party Amazon or manufacturer-direct stock; the BenQ TH671ST is a poor fit for set-and-forget garage installs (lamp maintenance, no dust sealing).
Choose the Optoma GT2100HDR if
- Builders who want Optoma's full 4,200-lumen laser platform at the lowest price
- Buyers who prefer a model with an established owner track record
- Shallow bays needing a 100-inch image from under 4 ft
Skip it if
- Buyers who want first-party Amazon or manufacturer-direct stock
- Anyone who wants a dedicated golf picture mode out of the box
Choose the BenQ TH671ST if
- Buyers who want the most documented, widely-supported entry sim projector
- Installs that need zoom flexibility on a budget
- Multi-use rooms where the projector doubles for movies and gaming
Skip it if
- Set-and-forget garage installs (lamp maintenance, no dust sealing)
- Bright rooms needing 4,000+ lumens
Common questions
Is the Optoma GT2100HDR better than the BenQ TH671ST?
In our Projectors for Golf Simulators ranking the Optoma GT2100HDR scores higher overall, 8.9 to 8.2, with the biggest advantage in Reliability & Maintenance. The BenQ TH671ST is stronger on Throw & Mounting Flexibility, so it is the better pick if that matters most to you.
How much more does the Optoma GT2100HDR cost than the BenQ TH671ST?
$78.64 more as of July 18, 2026: $1,027.64 for the Optoma GT2100HDR against $949 for the BenQ TH671ST. Prices move, so the merchant page shows the current figure. What the extra buys is mostly Reliability & Maintenance — 9 versus 7.2 in our scoring.
What is the main difference between the Optoma GT2100HDR and the BenQ TH671ST?
The headline spec difference is Resolution: 1080p Full HD (4K HDR input) on the Optoma GT2100HDR versus 1080p Full HD on the BenQ TH671ST. In use, the gap that matters most is Reliability & Maintenance (9 vs 7.2 in our scoring): light source life and dust protection in garage bays.