Why a Telephoto Dash Cam Is the Best Way to Capture Number Plates

Most people picture a dash cam as a wide-angle lens taking in the general view of the road. But what if yours could zoom in and clearly capture a number plate from 20 metres away?

That’s exactly what the VIOFO RTC420 telephoto camera is designed to do. As VIOFO’s first telephoto dash cam, it combines 4x optical zoom, a Sony STARVIS 2 sensor and advanced HDR to capture details a traditional dash cam might miss. It’s the ideal partner to a wide-angle front camera when clear number plates matter.

What makes a telephoto dash cam stand out?

4x optical zoom for precise capture

The RTC420’s 4x optical zoom focuses on the details that matter most. Its field of view is narrower than a wide-angle lens, but it comes into its own when clarity is critical, picking out distant number plates, road signs and vehicles.

The proof? It can clearly capture number plates from 20 metres away, even on the move, which standard dash cams often can’t.

Sony STARVIS 2 IMX675 sensor

The Sony STARVIS 2 IMX675 1/2.8-inch 5MP sensor reduces motion blur and image noise, giving smooth, sharp footage in all lighting. With 2.5 times the dynamic range of a similar-sized STARVIS pixel in a single exposure, it handles high-contrast scenes well, day or night.

Sharp 2K resolution

The RTC420 records crisp 2K footage, including distant details such as number plates, road signs and even scenic views, with minimal distortion.

Strong HDR performance

HDR balances bright highlights and deep shadows to prevent overexposure, so number plates and other key details stay clear on the move.

At night it’s even more useful, cutting glare from headlights and improving the visibility of reflective number plates for sharper, more reliable footage in low light. You can switch HDR on or off to suit the conditions.

The perfect partner to your front camera

The RTC420 complements your wide-angle front camera, adding powerful zoom to capture detailed 2K footage of distant objects a standard lens might miss. That’s why VIOFO launched the A329T series, available in four set-ups:

• A329T 3CH: 4K front + 2K rear + 2K telephoto
• A329T 2CH: 4K front + 2K telephoto
• A329TW 3CH: 4K front + 2K waterproof rear + 2K telephoto
• A329TC 3CH: 4K front + 2K cabin + 2K telephoto

Why you need a telephoto dash cam

Standard dash cams often struggle with anything beyond the immediate surroundings, and distant number plates and road signs come out blurry.

The RTC420 is built for long-range clarity. With 4x optical zoom, a STARVIS 2 sensor and HDR, it delivers sharp, distortion-free 2K footage, even in low light, bringing faraway number plates into focus when you need evidence most. If clarity at a distance matters to you, the A329T is the dash cam you’ve been waiting for.

Reflective number plates at night

With HDR on, the telephoto camera balances extreme contrast at night and avoids overexposure, so reflective plates under headlights stay readable.

What the experts say: Vortex Radar

Vortex Radar, a trusted YouTube channel known for in-depth reviews of radar detectors, laser jammers and dash cams, had this to say about the A329T:

• The telephoto camera allows you to capture those additional smaller details like license plates better, which a traditional wide-angle lens might miss.
• The telephoto camera can better capture a smaller license plate compared to a wide-angle camera.
• The telephoto camera also helps deal with motion blur. It may be the only camera that is able to capture a license plate clearly when the lighting starts to dip.

Better details

Less motion blur

Watch the full review: Viofo A329T Review: Best Dashcam for License Plates.

Final thoughts

A telephoto dash cam’s biggest advantage is capturing what standard wide-angle cameras often can’t: number plates and critical details at a distance. Mount the RTC420 on your windscreen, and its 4x optical zoom, STARVIS 2 sensor and 2K resolution bring distant objects into sharp focus, so you don’t miss the moments that matter.

Explore the A329T series: A329T 3CH, A329T 2CH, A329TW 3CH and A329TC 3CH.