Movi Smartphone Cinema Robot Payload Specs Please.....

Alistair Tibble · Jun 9, 2019

Frank Algermissen said: ↑

It seems that the combo MOVI + iPX + MomentWide seems to be no problem

By the way Moment seems to be involved somehow in the production - minimum with usefull input. Got this from here
and here

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Thank you for posting this..I've been anxious that the movi wouldn't really handle iphone 8 plus with weights etc, but it seems it will be ok?? I'm real novice and about to purchase for the first time. I should be ok eh?? Thank you very much. Alistair

Alistair Tibble · Jun 9, 2019

Maroot Nanakul said: ↑

Hi All
Thanks Frank, Andy, Gary and all others who might be interested on the Movi Payload limits.

I enjoy and learn from all your comments such as re-tuning/re-calibrating the Movi, Movi PID etc.

When loading down the Movi (or any brand of gimbal system for that matter) with Lens and counterweights eventually will get you to the point of motor inefficiency and strain. Another words a Movi with a bare iPhone 8 will work more robustly than a Movi loaded with an iPhone 8 with Case, Lens and Counterweights I'm assuming.

So all I'm wondering is what the Maximum recommended Payload Specification Weight for the Movi as stated from Freefly.

That way, any Movi User can set their phone (any phone) with or without case, lens and counterweight on a scale and compare it to see if they're over or under the stated Payload Spec.

For example you can probably get away with a more sophisticated lens setup like a Moment Wide Lens with Moment Case, a Moment 62mm Filter Adapter, a 62mm ND Filter, another 62mm Effects Filter and the required Counterweights on a iPhone 8 vs the same setup on an iPhone 8Plus or iPhone X. All this because the iPhone 8 is physically smaller and weights less than the 8 Plus or X (and falls within the elusive Movi Payload Specs)

I know you can achieve all this by trial and error and experimenting BUT it would also be nice to know what stated limits are too.

I guess it's really no big deal, but nice to know. Nice to know how the Movi compares to its competition. Nice to know if the Movi is going to work for the gear you had in mind. Your gear may be too heavy for the Movi. If so, shed some weight, make the necessary adjustments, else, the Movi is not for you.
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Hi. I've read your article but in summary will the movi be ok with iPhone 8 plus, together with weights etc?? I've seen various reviews which seem to say that all will be ok but very confused now?? I would want the iPhone 8 plus because of screen size. Why no definitive answer from anyone? Please further help. Thank you very much.

Alistair Tibble · Jun 9, 2019

Andy Johnson-Laird said: ↑

Hi Frank:
I could certainly make such a video but my concern is that it may still end up not being too much help because each Movi is likely to have its own "personality" -- so my settings would not be your settings even if you and I had exactly the same "payload" on the Movi.

I very much doubt there is anything that you could do during the autotuning/manual fine tuning that will damage the Movi. You are more likely to damage it by dropping it on the floor (please don't test this theory!)

Although I'm not an FF employee (just a volunteer) I have seen how thoroughly FF tests its equipment (for which read "tortures" their equipment), and even if you put the adjustments to crazy (aka "Scheißkopf") settings, all that will happen is that you will have re-invented a good massager for your neck and back! I've even tried powering up the Movi with no iPhone mounted on it and all it did was vibrate like crazy and started to move itself towards the edge of my desk...

In the hope that you find it helpful, perhaps I should explain in more detail what autotune is doing. It waggles the Movi gimbal + payload back and forth (you can see/hear/feel it doing this) to determine what the resonant frequencies of the payload + gimbal are, and then adjusts the stiffness values to the near-optimal point where the gimbal is as responsive as possible without it oscillating.

In more technical terms the Movi uses PID (Proportional Integral Differential) controllers and the issue is one of getting the "gains" set correctly. The best example of a PID I've heard is to imagine that you're driving your car on to an autobahn/freeway, so you need to accelerate up to the correct speed, thus you press harder on the accelerator to gain speed. As you approach the speed you want, you then reduce the pressure on the accelerator until it's just enough to hold you at the correct speed -- increasing and decreasing that pressure to match the flow of traffic. More aggressive drivers press harder on the accelerator and tend to overshoot and undershoot the required pressure (please don't tell my wife I wrote this... )

And that's what the three PID controllers are doing to stabilize the Movi gimbal + payload in the three axes -- the "stiffness" values are just another name for "how aggressive do you want me to be?" The autotune percentage is just a mathematical constant for how significant the autotuning values should be.

But after autotuning, you may still need to "tweak" the settings for the best performance without any tendency for the Movi PIDs to cause oscillation -- and that's where, if you're not careful, you can increase/decrease the values by too much and inadvertently skip right past the optimal values.

Of course, you can probably see now why the "tune it like you use it" is so important -- the resonant frequencies of the Movi gimbal + payload change if your hands are acting as shock absorbers and altering those frequencies.

Hope this all helps!
Grüße,
Andy.

Forensic Software & sUAV / Drone Analyst : Photographer : Videographer : Pilot (Portland, Oregon, USA): Trees=2, Ground=1, Props=11.
The Ground Is The Limit™
---------- Forensic Drone Analyst : Forensic sUAV Analyst : Forensic Unmanned Aircraft Analyst : Forensic Drone Expert
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Hi Andy. Please please can I simply ask if the movi will work ok with an iPhone 8 plus weights and basic lenses. I've read so many mixed reviews and mega confused. I want to purchase the movi but need to purchase the correct phone. MOVI say compatible with iPhone 8 plus but ok with lenses etc. Really appreciate any reply. I'm just a novice doing pre purchase research. Thank you very much. Alistair

Movi Smartphone Cinema Robot Payload Specs Please.....

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