If you've spent any time shopping for a dash cam, you've probably hit a wall of letters and numbers: WDR, HDR, G-sensor, loop recording, Starvis, CPL. Manufacturers throw these terms around like everyone already knows them. Nobody does when they start out. This glossary breaks down the vocabulary you'll actually encounter, in plain English, with a note on why each one matters when you're driving.
| Term | What it means | Why you care |
|---|---|---|
| WDR | Wide Dynamic Range — balances bright and dark areas in one frame | Stops the sky from blowing out while the road stays readable |
| HDR | High Dynamic Range — combines multiple exposures per frame | Better night detail, but can add motion blur on fast-moving plates |
| Starvis / Starvis 2 | Sony sensor families built for low light | Starvis 2 is the current benchmark for night plate capture |
| CPL | Circular Polarizing Lens filter | Kills dashboard glare and windshield reflections |
Almost every camera forces a choice between higher resolution and higher frame rate. A 4K camera running at 30fps gives you the sharpest possible stills for reading a plate. Switch it to 60fps and many cameras drop to 2.5K or 1080p to keep the files manageable. For most drivers, 4K at 30fps wins: plates matter more than buttery-smooth motion. Only go 60fps if your priority is tracking a fast-moving object frame by frame, like a motorcycle lane-splitting past you.
Your camera is only as reliable as its card. Look for "high endurance" cards rated for continuous write cycles — surveillance and dash cam use is exactly what they're built for. Endurance cards typically cost a few dollars more than standard cards but last far longer under constant rewrites. A standard card that's fine in a phone can fail in weeks inside a camera that writes non-stop.
Match the capacity the camera supports; oversized cards can cause stutter or refusal to record on older firmware. Format the card in the camera, not on your computer, so the file system matches what the device expects. Industry rule of thumb: roughly 1 GB per 10 minutes at 4K, so a 128GB card holds around 12–14 hours of footage split across loop segments, or considerably more at 1080p.
The vocabulary matters because it maps directly to what you'll pay for. A camera with 4K, Starvis 2, buffered parking mode, and a hardwire kit covers almost every real-world scenario. A 1080p camera with a weak sensor and no parking mode is fine for commuting but useless for catching a parking-lot hit.
If you're ready to match features to a real model, the RedTiger 4K line covers 4K capture, wide dynamic range, and app-based transfer at price points from budget to flagship. The same terms above apply when you compare it against anything else.
One more practical note: buy a spare high-endurance card and keep it formatted in the glovebox. Cards wear out, and the last thing you want is a failed card on the day you actually need the footage. For a deeper look at one feature in particular, our guide to CPL filters and glare explains how a $15 accessory fixes the most common complaint about any camera.
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