Best option is to mount the camera to your lid - that means your body absorbs the majority of the vibrations and also you can 'look around' which make the footage that bit more interesting.
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I have tried all kinds of mounts and positions but not been successful thus far. My Sony FDR-X3000 is brilliant with vibration stabilizing but the GS motor creates a lot of yello effect.
So far, no bike mounted position beats the stable and clear helmet mount.
The best bike mounted footage I’ve seen is from this guy. A cheap and simple design but a bit big to hide away.
https://www.youtube.com/watch?v=SnMP81pcMWU&t=423s
When I have time, I’m going to try and build one with a slightly smaller footprint to suit my Sony.
It all depends on what you want to use the footage for.
For daily commute, you want a clear video that will show the reg number if you’re in an accident. In my opinion, the helmet mount is the best option for this.
For touring and track days etc., where you’ll want to keep or share the videos, its great to have the camera mounted so you can see the bike in motion. Helmet mount is also good because you’ll see the dash and front wheel.
Below are some of my 4K 30FPS video clips with my Sony mounted on the indicator stalk and others on the helmet. Wind noise is bad on some so turn the volume down.
If you look at the trees you’ll notice some wobble or yello effect on the bike mount but great quality video on the helmet.
I also find where you see some of the bike in the videos, you feel more part of the ride instead of just looking at a video… if that makes sense
Bike Mount