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Photometric vs radar launch monitors
The two ways a launch monitor reads your shot decide how much space it needs indoors. Here's the difference in plain terms - and which suits your room.
Last updated: June 2026 · See our methodology.
How each one works
Behind-the-ball radar (Doppler): sits behind the ball and tracks it through the air, measuring flight to derive speed, launch and spin. Because it watches the ball travel, it needs 6–10 ft of clear space behind the ball - more room depth than any other setup.
Side-placed camera (photometric): sits beside the ball and takes high-speed images of the ball and clubface at impact, calculating the numbers from that moment. It needs no ceiling mount and almost no depth behind the ball, which makes it the natural fit for shallow or low-ceiling indoor rooms.
What it means for your room
| Side-placed camera (photometric) | Behind-the-ball radar | |
|---|---|---|
| Placement | Beside the ball | 6–10 ft behind the ball |
| Depth needed | ~Zero behind the ball | Most (6–10 ft behind to read flight) |
| Best room | Tight / shallow / low-ceiling | Deeper rooms, outdoors |
| Ceiling mount? | No | No |
| Examples | SkyTrak ST MAX, Bushnell Launch Pro, Foresight GC3, Uneekor EYE MINI, Square Golf | Garmin R10, FlightScope Mevo+ / Gen2, Full Swing KIT |
Which should you pick?
- Shallow or low-ceiling room (under ~13 ft deep): favour a side-placed camera beside the ball - no ceiling mount, ~zero depth behind the ball - for the most consistent indoor data.
- Comfortable depth (16 ft+): either works; behind-the-ball radar units like the R10 / Mevo+ are great value once you have 6–10 ft behind the ball.
- Tight-room default: the side-placed SkyTrak ST MAX is a popular home pick that needs no room behind the ball.
Accuracy isn't strictly "camera vs radar" - top units of both types are excellent. Space (especially the depth a behind-the-ball radar demands) and budget usually decide it for a home build.
Find your room's answer
Enter your depth and ceiling in the free room-fit calculator - if your room is shallow, it will steer you toward a floor/photometric setup.
FAQ
- Is a camera or radar better for an indoor simulator?
- A side-placed camera is usually the easier indoor fit (sits beside the ball, no ceiling mount, ~zero depth behind it). Behind-the-ball radar needs 6–10 ft behind the ball - the most room depth - and excels in deeper rooms and outdoors.
- Why does radar need more space?
- It measures the ball in flight, so it sits 6–10 ft behind the ball and needs that depth. A side-placed camera reads impact from beside the ball with almost no depth behind it.
- Which units are which?
- Behind-the-ball radar: Garmin R10, FlightScope Mevo+ / Gen2, Full Swing KIT. Side-placed camera: SkyTrak ST MAX, Bushnell Launch Pro, Foresight GC3, Uneekor EYE MINI, Square Golf.
Related
Best launch monitors · SkyTrak ST MAX review · R10 vs Mevo+ · Room size · Room-fit calculator