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 Magic Lantern`s ETTR bulb ramping via external trigger? 
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Joined: Thu Feb 18, 2010 4:47 am
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Location: St Gallen, Switzerland
Post Magic Lantern`s ETTR bulb ramping via external trigger?
I read on the Magic Lantern forum that bulb ramped time lapses running the ETTR facility in Magic Lantern can be triggered by an external intervalometer:

http://www.magiclantern.fm/forum/index.php?topic=6745.0

If it could be made to work, this would be a bit mouth-watering for a backpacker like me trying to save weight (I already carry a mini-laptop for GBTimelapse but would like to bulb ramp a second camera with minimal extra gear). Has anyone tried this with an external intervalometer firing the camera rather than ML`s internal intervalometer? I`m thinking of the eMotimo TB3 or the MX2 as the trigger in my case. I shall try this but seeking input from folks here also. Thanks.


Wed Jun 04, 2014 10:04 am
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Location: St Gallen, Switzerland
Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Experimented with the two together tonight - the TB3 and a Canon 6D with ML in ETTR on mode - trying to simulate an astrolapse at 23 second exposure. I hit two problems:

1) I haven`t yet been able to get ML to obey the interval set in the TB3 menu. The interval is way too short, the next shot starting just after the previous shot even though I`ve programmed a 5 second delay between.

2) There`s a way to cap the shutter speed limit but not the iso limit. My 6D is happy at iso 6400 but much less so at 12800. I don`t want ML to be adjusting the exposure in the direction of too much noise but I don`t see a way to prevent that short of guessing beforehand about the aperture so that there`s plenty of headroom.


Thu Jun 05, 2014 11:52 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Thanks for the update. I was reading through the ML forums yesterday after reading your initial post and from what I could gather, it sounded like you should be able to put limits on ISO, shutter speed etc.

I couldn't point you to the exact article, it was hard enough making sense of the many posts on ETTR and why bramping was no longer an option. If I find something useful I'll post back here, but I'm in the same boat as you - I own a TB3 and would also like to control the ML ETTR with it.

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Thu Jun 05, 2014 1:54 pm
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Here are a couple of links that may help, I'm still reading through it all myself, problem is there are so many confusing posts on ETTR and it doesn't seem to be a simple 'set this, that and the other, and start shooting'. Then there are scripts to smooth out flicker in the RAW files, and so on...

http://wiki.magiclantern.fm/ettr

http://www.magiclantern.fm/forum/index.php?topic=5705.0

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Thu Jun 05, 2014 2:03 pm
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Location: St Gallen, Switzerland
Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
What I have at least been able to do is use ML`s own internal intervalometer and fire an MX2 from the pc flash port of the 6D (to ext 1 on the MX2, ie I/O/2 in ext intervalometer mode). At least then I have two dc motors to run from the MX2.
I haven`t tried firing the TB3 from the camera using the I/O port of the TB3. I read somewhere that that doesn`t work though I`d like to be wrong.


Fri Jun 06, 2014 1:28 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
One solution is to keep the camera and TB3 unconnected ie have the camera running from ML`s internal intervalometer and the TB3 controling its various axes but not the camera. As long as the programmed interval on both is the same and as long as Start is pressed on the camera and on the TB3 at the same time, then I guess it should work. Of course if you want to ramp the interval like GBTimelapse does, you`re stuck. But for example for an astrolapse with a moonstrike on a tree half way through it should be ok.


Fri Jun 06, 2014 11:57 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Have you tried that disconnected idea? I haven't yet played enough with ML's ETTR without my TB3 to see how well it works.

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Sat Jun 07, 2014 3:08 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
I`m trying it tonight Karl.

Not to involve you too much in my personal details, but my wife is not well, so I have to catch the last cable car down to cook her evening meal. So I left both the TB3 and camera (ML) on a delayed start of 7 hours! (ie an hour after sunset). We`ll see.


Sat Jun 07, 2014 8:40 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Sorry to hear about the wife - sounds like you're dedicated to both her and the photography!

I tried my first day-to-night timelapse with ML's ETTR this evening, and the results were terrible - way too much flicker. It was so bad I didn't even want to post an example. Not sure if I've not set something right in ML or where the problem comes from. More research needed perhaps.

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Mon Jun 09, 2014 2:27 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Just updating you Karl:

http://www.magiclantern.fm/forum/index.php?topic=12260.0


Wed Jun 11, 2014 7:39 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Thanks Ian, I'd actually found that thread on the ML forum so had been following it.

I downloaded the flicker / ramping script and ran that over my initial day-night attempt which actually smoothed things out considerably, so I now have more faith in the whole process. I've yet to getting the TB3 to fire the camera while running ML's ETTR, but in theory I see no reason why it shouldn't work.

You're pretty game leaving your camera setup unattended for that length of time! Have you somewhere safe to leave it up the mountain?

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Wed Jun 11, 2014 1:50 pm
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
I try to go as far off the beaten track as I can, but yes it`s a worry. When I come back, the first worry as I approach is, is it still there? The second worry is, has it worked? It often hasn`t :( and then I have to console myself with merely having had a workout.
The Swiss are an honest folk too. And the kind of person who might find himself in that kind of terrain on a Sunday morning is usually not the kind of person who might be tempted to steal. Fingers crossed anyway.


Wed Jun 11, 2014 8:04 pm
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Very trusting! Have you thought of putting up some signs saying something like "Danger, animal traps in area" to keep people away? ;)

I'm going to try a TB3 + day-to-night shot this weekend and use your idea of not connecting the TB3 to the camera, and just hitting start on both of them at the same time. One idea I haven't found a solution for yet is ramping the interval from a shorter interval during the day (ie maybe 5 seconds) up to a longer interval (say 20 - 30 seconds) at night. A 20-30 second interval for any sort of movement during the day is obviously far too long, may have to read more on the ML forums regarding this.

{Edit}: With a little searching it seems ML's Advanced Intervalometer should be able to ramp interval as well.

http://www.magiclantern.fm/forum/index.php?topic=8431.0

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Wed Jun 11, 2014 8:27 pm
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Joined: Mon Dec 26, 2011 2:48 am
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Location: victoria australia
Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
How did it go Karl ?

I want to try the Timelapse plus with the dynamic perception stage zero dolly with the mx2 with the Merlin mount to do a ramping from day to night.
I have the interface (Terand Adaptor) which we made to interface between the mx2 and Merlin mount.
Hope to get this up and running soon the track length is 10' long.


Sat Jun 21, 2014 3:36 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Last weekend was terrible for shooting so I went out last night but without the TB3 - just a 1.5 hour (or so) static shoot on tripod. Unfortunately, even after running the 'deflicker script' over the set of images the shoot really turned out horrible. Still a large amount of flicker, and what was worse was the vast colour temp change. The finished clip must have shifted through 4-5 different colour ranges, as you can see.

Admittedly this was only my third attempt at ML's ETTR, and I was really hoping this would be as simple as it sounds. If it were to work as well as I'd hoped, I'd be straight on to incorporating the TB3. But at this stage there are still these glaring problems that ( I ) need to work out first.

Here's the clip, initially run through Bridge/ACR to adjust levels etc, deflicker script, then a PS action script. Strangely enough after running the deflicker script I received the (or along these lines) message 'additional deflickering may be required). I tried to run the deflicker script a second time and kept receiving an error after which I had to kill Bridge.

Password is: dtn

https://vimeo.com/98802228

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Sat Jun 21, 2014 4:30 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
darkskies wrote:
Hope to get this up and running soon the track length is 10' long.


Did I read that correctly - a 10 foot track?! What's that - 3m?

I'm waiting for the 4ft Rhino track for the TB3 to arrive in aus.

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Sat Jun 21, 2014 4:53 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Yes that's correct 3.3 ft to 1 m ......
I have a 4WD with a roof rack and had a 10'4" pipe on the top with screw ends caps and made foam cutout to go around the track when it is in the pipe so it does not move .


Sat Jun 21, 2014 5:43 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Well done Karl like to see a bit more when you get the track !

Timelapse plus might help with the bulb ramping instead of ML .


Sat Jun 21, 2014 5:53 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Here's a test I ran last night attempting a day-to-night with Magic Lantern running Auto ETTR, and the eMotimo TB3 + Rhino Slider.

It turned out easier to do than expected, the TB3 firing the camera/ML at the interval set (15 seconds), and ML taking care of the ETTR and ramping.

The location wasn't great as I hadn't noticed the street lights behind me which lit the foreground a lovely orange, and I just missed the actual sunset by about 30 mins due to some silly card issues, but it was a good run through for proof of concept.

Technical Details:

* Camera set to manual and manual focus, image review 2 seconds.
* ML with Auto ETTR, max shutter 10 seconds, max ISO 3200, Adobe XMP sidecar files (all settings other than the intervalometer as per the 'how to' on ML forum).
* TB3 interval to 15 seconds, 11 seconds static time, 3 hour shoot time.
* Initial camera settings: ISO 100, f5, shutter 1/100th.
* Final camera settings: ISO 800, f5, shutter 10 seconds.
* Adobe Bridge deflicker script run over the RAW images 2-3 times.
* No additional post processing, everything (other than deflicker script) is out of the camera.

Next time I probably won't shoot at f5 for this kind of scene, and found a better location a few hundred metres along away from street lights. Pretty happy with the low amount of flicker. Did forget about the lense twist though so that may have helped even more with reducing flicker.


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Sat Aug 02, 2014 6:55 pm
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Joined: Thu Feb 03, 2011 8:19 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
Hey. I'm quite new to ettr but i tried it out together with my edelkrone slider and the action module. the problem is, that ettr doesn't work when the camera (5d mark iii) is connected to an external trigger (edelkrone action module). the problem is, when connected to any external trigger, ml isn't capable to activate the picture preview which is essential for ettr to work. any idea how to make ettr work, when connected to an external trigger? thanks for your help!!!


Tue Jun 28, 2016 8:23 am
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Post Re: Magic Lantern`s ETTR bulb ramping via external trigger?
If you read the fairly detailed post above you'll see that it is entirely possible to trigger ML from an external source.

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Tue Jun 28, 2016 2:42 pm
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