Optoma GT3900UHD Review: True 4K at a Short Throw

A 0.496:1 throw ratio, 4,000 lumens and a 30,000 hour laser, for under $1,500.

The verdict: Buy it if you want 4K resolution, a very short throw and a maintenance-free laser light source in one projector under $1,500. Skip it if you are mounting to a shelf rather than a ceiling, because a 0.496:1 lens sits close to the screen and that is exactly where the ball goes.

Specifications

Specifications above come from Optoma's published product specifications. Treat pricing as approximate, since Amazon pricing moves.

What it does well

• A 0.496:1 throw ratio is genuinely short. The projector sits roughly half the image width from the screen, which is what lets it live forward of the hitting position and out of the swing path.
• Player shadow is the most underestimated problem in a bay, and a short lens mounted forward of the ball is the fix.
• Four thousand lumens holds up with lights on, which matters if the bay is also a garage or a games room.
• A 30,000 hour laser means no lamp replacements, and no gradual dimming that you only notice when it is severe.
• Low input lag at 4K/60 and 1080p/240 means the image appears when the shot does, which sounds trivial and is not.

Where it falls short

• DLP projectors in this class reach 4K UHD by fast pixel shifting rather than with a native 4K panel, which is standard for the category and is worth knowing before you compare it against a native 4K device.
• A very short throw ratio means placement is unforgiving. Six inches out and the image no longer fits the screen, so measure before you mount.
• Mounting it forward of the hitting position puts it above the swing arc, which means a solid ceiling mount rather than a shelf and a careful look at where a topped ball goes.
• Brightness figures come from the brightest picture mode, which is never the most colour-accurate one. Every projector loses lumens in an accurate mode.
• DLP produces a rainbow artefact for a small proportion of viewers, and once mounted to a ceiling it is not a quick thing to swap.

What owners report

Owners consistently report a sharp, bright image and specifically praise the short throw for eliminating shadow, which is the practical reason to buy this class of projector for golf. The recurring warning is placement: a 0.496:1 lens gives you very little room for error, and people who mounted before measuring describe redoing it. Laser longevity and the absence of lamp costs draw consistent praise.

Measure the mounting position before you order with the projector throw calculator and the throw ratio chart. Ceiling mount vs floor projector covers the mounting decision, and short throw vs standard throw explains why the lens matters more than the specification sheet.

Who it suits

• Bays where player shadow on the screen has been the problem.
• Rooms too shallow for a standard throw projector.
• Buyers who want 4K without paying premium home cinema prices.
• Anyone who wants a laser light source and no lamp schedule.

Who should skip it

• Shelf or floor mounted setups, where a short lens sits in the ball's path.
• Rooms where the mounting position cannot be measured accurately in advance.
• Viewers sensitive to DLP rainbow artefacts.

Alternatives worth considering

Keep reading

• Short throw vs standard throw projector
• Ceiling mount vs floor projector
• Projector throw calculator
• Best golf simulator projectors
• BenQ AH700ST review
• BenQ TH671ST review

This review draws on published specifications, manufacturer figures and the consensus of verified owner reviews. We have not tested this product ourselves, and we say so rather than implying otherwise. As an Amazon Associate we earn from qualifying purchases.