I thought I would just post this in hopes that a) it could help fellow ACs troubleshooting, and b) it might spark some changes on future products or firmware.

With both the older Latitude MDR and the new MDR.S the biggest downside of the system is that it will auto-calibrate at start-up. I can understand why the engineers thought this would be a good idea since the motor has "no idea" what happened in between power cycles and therefore a calibration is needed. I will argue a few points against this:

1. The gold standard of wireless focus for decades was Preston, which did not enable a feature like this. It's the ACs job to know when something has changed and calibrate accordingly. Honestly, even the act of plugging in a motor cable to a Preston triggering an autocalibration was a bit annoying, but avoidable in most cases.

2. This creates a scenario where if the MDR and motor loose power even momentarily, an autocalibration is inevitable, and in fast pace set environments this reflects poorly on the operator and can derail a scene mid-shot (more about this below).

3. A reasonable argument that the autocalibration is to protect the motor from "jumping the lens" when it hits a hard stop unexpectedly is moot, because if one changes lenses and forgets to calibrate, this can happen just as easily. In that scenario it is on the AC to make sure calibrations are happening at the appropriate time, ergo, why not at startup?

This issue came up for me when I first bought the Latitude and was powering it through the Mini LF's 2-pin port. Everything was running fine until the onboard battery started to dip. It took me a while to acertain, but the power outputs on the Mini LF are rated at pretty low amperage, and when the MDR was asking for more power than it could provide, it would reboot, thus initiating a calibration. As you can imagine, a series of handheld shots getting interrupted by an unexpected calibration was embarrassing. Especially since this was a system I had vouched for to the DP.

Obvioulsy there are workarounds by using higher amp rated ports and once I realized what was going on it was easy to fix.

I hoped that by purchasing the MDR.S and powering via 24V I could avoid the issue, but yesterday the same thing happened via the 24V port on the LF. I was ready for it this time and quickly reran the power without anyone noticing.

Long story short, to my eye the auto-calibration on start-up is the biggest liability of this system. Ideally this will be addressed, as well as perhaps a less sensitive amperage requirement or at least an indication that the MDR is close to overdrawing so that it can be diagnosed.

Sorry for the long post :)