ND FILTERS FOR THE O3 AIR UNIT | Should you be using them?
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- čas přidán 5. 12. 2022
- I test out the Freewell Standard Day ND Filter set for the DJI O3 and Avata FPV drone. Can they solve the Jello issues seen in certain environments? particularly low winter sun.
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andy@cloudsto.com - Věda a technologie
Nice footage! I also feel like in the ND8 and ND16 example, the shutter speed is still too high for some reason. There is barely any motion blur. I believe that it would look a lot better (and more stable) if you locked the shutter at least and let the cam do auto ISO. I've used down to 1/60 on 60fps on my O3 and it is very smooth - although that is quite a lot of motion blur. Like other commenters mentioned, 1/120 locked shutter is probably ideal for 60 fps.
In the end what gives you stability in the image or rather what defeats 'jello' is lower shutter speeds. The ND filter helps you get to those on a bright day. I think of it as the camera 'averaging' more light into a single frame, thereby smoothing out any vibrations
I learned alot from this comment - Thank you sir.
Andy, Great videos as usual, after watching them I want the DJI 03 and of course a frame so this is what i've come up with which I hope will work, thanks again. Explorer LR 4 HD DJI O3 Sub250 4K/1080P Micro Long Range
Youd need those higher nd's at 30fps due to its very nature it lets in more light. Youd also get that cinematic motion blur at 30 but have more latency in the goggles.
Definite improvement Andy using the ND8. Looked great to me but I'm watching on my phone...That baby quad is a ripper. You can't even begin to compare the Avata and this quad. Two very different flight envelopes....🤔🤔😏😏🇬🇧
They won’t fix stabilisation issues, but it’s smoother footage with proper motion blur when flying close to stuff if your shutter speed is double the frame rate that you’re shooting. 60fps = 1/120 shutter. Then its a case of working out which ND is required for that day, based on those settings. Prob an ND16 on that day if the camera aperture is fixed to f2.8. With an ND8, your shutter would have been higher than needed to prevent over exposure. I tend to fly with auto ISO capped at as high as I think it would need to go that day when flying through the darkest spots, then manual settings for everything else. 👍
I'm not completely certain, but I think the weird issues are caused by a mixture of the high shutter speed and perhaps HDR trying to expose certain parts of the image differently, but causing differences frame by frame. I have seen that be a thing before.
To me it looks like the issue you're experiencing is gyro interference due to your motor PWM frequency. It's a known issue with this setup and the only real fix is to soft mount your camera or change your motor PWM frequency in BLHELI (or both for best results). This should have been picked up by DJI very early on. There's a similar issue when using GoPro 5 and 7 with reelsteady, the gyros used couldn't handle the high frequency vibrations produced by qauds resulting in gyro logs that were too dirty to use for stabilisation. On the big screen even after you fitted the ND filters it's still quite noticeable.
*From DJI's own support page*
Mechanical vibration at certain frequencies may result in abnormal EIS performance of DJI O3 Air Unit. The principles are as follows:
I. IMU Resonance
The usual ESC PWM control frequency is 24 kHz by default, and the camera IMU frequency is approximately 24-30 kHz. If there is no effective vibration absorbing measure, the motor vibration may be transmitted to the camera IMU, causing resonance because the frequencies coincide. The resonance will affect the IMU data accuracy and EIS performance of the video stabilization application.* As a result, the processed video image shakes, but the live view image is not affected. Usually, frames with TPU or vibration-absorbing rubber are not prone to IMU resonance.
* Video stabilization application refers to either the DJI O3 Air Unit EIS function or third-party video stabilization software.
II. Propeller Vibration
If the rolling shutter effect appears in both the live view and the video image, it is usually because the propeller vibration (frequency is approximately a few hundred Hz) is transmitted to the camera through the aircraft frame.
Follow the steps below to troubleshoot and fix the image stabilization issue:
Step 1: Rule out the IMU resonance issue.
1. Remove the propellers from the aircraft. Make sure that the camera is securely mounted and the aircraft is placed in a stationary position on the ground. Then, enable RockSteady and start recording.
2. Start the motors and slowly push the throttle to the full throttle position. Observe the live view in the goggles. If the live view is not shaking, stop the motors and stop recording. Otherwise, check the camera and make sure that it is securely mounted.
3. Export the recorded video and check it. If the video image shakes, the issue is most likely caused by the resonance between the frame and the camera IMU.
In this case, refer to the following solutions:
a. Change the ESC PWM control frequency to 48 kHz or 96 kHz and test again.
b. If the video image shakes after solution a is adopted, apply a softer vibration-absorbing structure between the camera and the aircraft frame. Repeat the above testing procedures until the video image does not shake.
This👆🏾
Hi - what is the width in mm of these filters? Im wondering if they will fit my frame...
Hard to judge, I'm watching on a 4k screen but You tube is maxed out at 1080p60. HD.
ND8 filter looks best though. Have you tried a UVB filter on blue days?
I was looking for 03 nd filter stuff.... back at your channel 😂 ✌️
🤣🤣🤣
You said that your Avata has really good video quality, but it is the same o3 camera. What is the difference? How can we adjust the diy o3 to be like the avata?
What would you recommend for a starter drone Andy 🤔, this is a good watch, good tunes
Hmm, begginer fpv or a camera drone?
Your recommendation for both would be appreciated thanks
4:00 yeah
Beautiful flight New subscriber
Welcome!😊 thanks for the sub. There's lots of stuff on the channel! Keep an eye out for the FPV stuff, lots more coming👍🏻
I'd be great if you could lock the Settings for recording. I mostly use Gopros and I lock the Settings to 30FPS 1/120th s Shutter. 400 ISO Limit and 4500k - 5500k White Balance. Then I add the right ND Filter depending on the amount of lighting. But of course DJI has different image processing and I don't even know if you could lock the settings or not.
You certainly can lock them :) in the camera settings menu via goggles
@@GeKoFPV Then I would definitely lock them. Especially White Balance and shutter
Is the drone wired through a bec or vbat? If using vbat then obviously you could be getting uneven voltage to the air unit
Been using straight vbat since OG air unit all the way to 6 of my 03 air units and have never had any voltage spikes mess up any air units.
If you increase the pitch of your props a little, you could switch to two blade propellers. This means you could balance them using a propeller balancer ( A cheap item).
🤔🤔😏😏🇬🇧
Thanks for the info. Is that a sub250? Home build?
It's an iFlight IH2 👍🏻
I'll don't fly drones, but interesting to see this anyway! (LB1NH)