CORRECTION:
Checking further X8 cam 4k 30fps, previously used 26% showed slight jello.
With 24C degree at the test, Gain % for no jello seems;
100% default
1%, 3% (Probably 2% also which was not tested)
Slight jello observed 5% and larger, especially 57% and larger.
==============================

Hearing someone 's suggestion to set gimbal gain below 10% for jello free, did test as follow;
1. Default 100%
2. Currently using 26%
3. 1% to 73% by 2% increment

Result is;
A. Viewing FPV screen;
No jello - Gain 100%, 26%, 1% thru 57% (2% increment).
Jello - Gain 59% and larger to 73% which I ended the test due to low battery.
B. Checked only few X8 4K 30FPV video;
No jello – 100%, 26%, 1%, 3%, 55%, 57%
Jello – 59%, 61%

Temp. at the test was around 24C degree.
With this temp, seems default 100%, 1% thru 50% range would work for jell free.

Other note – FPV screen showed “Operation failure Error Code=1” popped up when adjusting gimbal gain % before taking off and during the flight.
Auto RTH worked and made PL on the landing pad.
So I assume this “Error Code=1” relates to gimbal setting.

Timeline;
0:15 Silicon leg extension attached
0:22 FW 1061D
0:50 During gimbal gain adjustment, “Operation failure Error Code=1” popped up for seconds
0:59 Set Max. speed at 8.0m/s expecting better result for filming
1:07 Gain 100% forward flight
1:46 26% backward
2:35 1% forward
3:11 3% backward
3:45 5% forward
4:19 7% backward
4:55 9% forward (vibration for sec)
5:26 11% backward
======== Cut ======
6:05 gain 57% backward
6:41 59% Jello and “Operation failure Error Code=1” popped up
FPV data 3.0m H, 6.9m D, Sats 17, 11.03v, remaining 37%
6:59 59% jello, forward
7:16 61% jello, backward
7:43 63%, jello, forward
8:09 65% jello, backward
8:34 67% jello forward
8:58 69%, jello, backward
9:33 71%, jello, forward
9:56 73% jello, backward
10:28 Auto RTH
10:41 Landing pad detected at 12.1m H
11:06 landed on the pad
========= Cut =====
11:41 X8 Cam gain 100% forward
12:30 26% backward
13:10 1% forward
13:43 3% backward
======== Cut ====
14:07 Gain 55% forward
14:51 57% backward
15:16 59% Jello forward
15:56 61% backward
======== Cut ======
16:29 FW FC 1061D
16:40 Flight Records 159.0km, 28h41min, 511flights
16:44Pick up 10:20 4.7km, 22:12 for gimbal gain test
17:48 Gain 100% forward
18:40 26% backward
19:22 1% forward
19:56 3% backward
======== Cut ====
20:29 gain 56% backward
Data 39.0m H, 6.9m D, Sats 17, 11.03v, remaking 37%
21:03 gain 50% Jello forward
“No warning” on Flight Record
======== Cut ======
21:33 Gain 73% backward
22:00 Auto RTH
23:14 Landed

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