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1

crop_rec and derived builds / Re: crop_rec_4k derived builds for 700D / T5i

« on: June 21, 2019, 06:06:30 AM »

t5i not allow to trigger 3rd party flash in live view. Is there any work around with ML.

I know this is an old post and I was wondering if anyone figured out a way to do this? It looks like ML for some older cameras has a feature to allow for this, but I looked in the “Flash Tweaks” menu on my t5i and there is no option for this

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Camera-specific Development / Re: Canon EOS M

« on: July 09, 2018, 12:13:38 AM »

@EstaDive: what if you just disable Auto Power Off in Canon menu? Does the EOS M has some standby mode where it turns off just the display? (other models do this if you press INFO a few times, outside LiveView)

Yeah, the EOS-M has a standby mode where it can power down the display, but leave the power on. The flash stays on in this case. I was worried that I will accidentally turn off the camera power during the dive, since I use pretty thick gloves and don't always hit the button that I intend to.

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Camera-specific Development / Re: Canon EOS M

« on: July 08, 2018, 11:36:29 PM »

If I remove the battery without powering down, the flash stays on. However, if I turn it off by opening the battery compartment the flash turns off. 

I think the AE lock was a bit of a red herring. If I press any button on the camera, the flash will power off when the camera turns off. This is true even if the flash is not attached when the button is pressed.

Here are a collection of logs:

Odd numbered logs, I do not do AE and the flash stays on. Even number logs, I do AE/Lock (4,6,8) or enter the flash menu (10,12) and the flash turns off.

https://anonfile.com/Q809l0fbb8/magiclantern_flash_logs.tar.gz

There is no single log line that is present in all of the "off" cases that is not present in any of the "non-off" cases. So it must be more complicated than a single mpu message. Perhaps part of a large MPU message? Or handled entirely within the MPU, in which case it sounds like disabling the auto-off would not be possible.

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Camera-specific Development / Re: Canon EOS M

« on: July 08, 2018, 07:50:13 PM »

I might have a fix for that, but I'm not sure what to do with the UI. On other models you just dial the desired shutter speed from scrollwheel.

Does the flash have its own power source (batteries)? Assuming yes; otherwise you wouldn't ask this question.

The communication between camera and flash is likely done by the MPU; however, we are not exactly familiar with its CPU architecture. To figure this out, one may also need to log the communication through the hot shoe. I use neither a flash, nor an EOS M, so can't help much other than some advice.

The flash has its own batteries. Is there a way to log the MPU messages sent during shutdown? From the link you sent, there are instructions to log the startup, but not shutdown. I haven't figured out how to reproduce this behavior without turning the camera off. 

--edit--
I've noticed that the flash only powers off if the camera has communicated with the flash, either through the flash settings, taking a picture, focusing, or pressing the AE lock button. If I just turn the camera on and off the flash stays on. So I think if I can log the shutdown sequence, it should be possible to find what signal is being sent by comparing shutdowns with the flash attached and flash unattached.
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Moderators - feel free to move this to reverse engineering or feature request if that is a more appropriate location.

5

Camera-specific Development / Re: Canon EOS M

« on: July 06, 2018, 06:52:33 PM »

I have a 90EX speedlite that powers off automatically when the camera turns off. Is it possible to disable this feature via ML?

I am using it to trigger external strobes through an underwater housing. The problem is, the flash power button is not accessible via the dive housing, so if the camera powers off (powersave, or I accidentally hit the power button)  then the flash is off for the rest of the dive and I can't trigger the strobes.

There does not appear to be a canon native way to disable it. It is a documented feature:
https://support.usa.canon.com/kb/index?page=content&id=ART136735

and there is a way to disable the 5-minute idle power, off, but it doesn't stop the flash from turning off with the camera.