TonyM
Well-Known Member
- Joined
- Jul 30, 2013
- Messages
- 5,446
- Reaction score
- 5,121
- Country
- United Kingdom
- Dash Cam
- Mobius 1S Telephoto, A139, B1W
Since we're here, we can look at another comparison between number plate capture at night on 4K HDR vs 1080p telephoto - all 3 frames are at the same moment in time for direct comparison.
You can see that when viewed at 100%, the A139 Pro 4K has almost the same magnification as the 6mm telephoto 1080p camera. Accordingly, the 8mm 1080p camera has a bit more magnification, and is the only one where we can read "York Van Centre" on the back of the ISUZU truck, or "follow A64" on the yellow sign.
The metering seems to be affected by what proportion of the frame is filled by bright objects (headlights & reflections), so when I'm up close behind other cars the telephoto cameras record a darker exposure, which is actually useful to avoid clipping highlights. The shorter, darker exposure still cannot match the A139 Pro HDR though.
NOTE - Ignore the "HDR ON" text in the telephoto frames. That relates only to the main 5MP A139 camera where I did have HDR turned on. HDR is not a feature of the IMX291 remote cameras.
A139 Pro, 4K STARVIS 2 HDR (wide angle) (2x crop, i.e. 100% at 1920x1080)
1080p IMX291 STARVIS 1 (6mm F1.2)
1080p IMX291 STARVIS 1 (8mm F1.8)
You can see that when viewed at 100%, the A139 Pro 4K has almost the same magnification as the 6mm telephoto 1080p camera. Accordingly, the 8mm 1080p camera has a bit more magnification, and is the only one where we can read "York Van Centre" on the back of the ISUZU truck, or "follow A64" on the yellow sign.
The metering seems to be affected by what proportion of the frame is filled by bright objects (headlights & reflections), so when I'm up close behind other cars the telephoto cameras record a darker exposure, which is actually useful to avoid clipping highlights. The shorter, darker exposure still cannot match the A139 Pro HDR though.
NOTE - Ignore the "HDR ON" text in the telephoto frames. That relates only to the main 5MP A139 camera where I did have HDR turned on. HDR is not a feature of the IMX291 remote cameras.
A139 Pro, 4K STARVIS 2 HDR (wide angle) (2x crop, i.e. 100% at 1920x1080)
1080p IMX291 STARVIS 1 (6mm F1.2)
1080p IMX291 STARVIS 1 (8mm F1.8)