Magic Lantern Forum

Developing Magic Lantern => Feature Requests => Topic started by: starfish on April 11, 2013, 10:04:43 AM

Title: [DONE] Shutter speed fine tuning
Post by: starfish on April 11, 2013, 10:04:43 AM
Hi everybody,

I often have to film hardware with included LED lights or hardware screens, which are flickering in certain high frequencies. The flickering is invisible to the eye, but as soon as you film it, it get's very obvious (because of the non synchronized speeds of hardware LEDs/screens and camera shutter). The only way to get rid of it seems to fine tune the shutter speed to unusual values like 1/35.57 for example (depending on the filmed hardware). Up to now I only found this possibility in Canon XF100/105, Canon C100/300 (Clear scan) and Sony EX1/3 (Extended clear scan). Would it be possible to ad something similar to 5D II/III via ML?

Thanks and best,
s.
Title: Re: Shutter speed fine tuning (Clear scan)
Post by: a1ex on April 11, 2013, 11:42:05 AM
Technically possible only for 60D, 5D3, maybe also 600D and digic V cameras (via FRAME_SHUTTER_OVERRIDE). Maybe integrate it with the extreme shutter speed menu? (it uses the same mechanism).

For other cameras, FPS override is the only hope.
Title: Re: Shutter speed fine tuning (Clear scan)
Post by: starfish on April 11, 2013, 02:22:18 PM
Would be a reason to switch from 5D2 to 5D3 for me, if it would be implemented.
Title: Re: Shutter speed fine tuning (Clear scan)
Post by: a1ex on April 11, 2013, 09:35:01 PM
Seems to work, shutter speed can be adjusted in 20-microsecond steps. Please check the math:

https://bitbucket.org/hudson/magic-lantern/commits/8750db7afe91

(the same feature can be used for very fast shutter speeds, if you fine-tune from 1/4000).
Title: Re: [DONE] Shutter speed fine tuning
Post by: starfish on April 11, 2013, 10:15:06 PM
Wow, that was fast: thanks! :)

So this feature will be included in the latest nightly build, but will only work on 60D and 5D3, right?
Title: Re: [DONE] Shutter speed fine tuning
Post by: 1% on April 11, 2013, 11:15:32 PM
Should work on 6D too. The original did.


*have 2 small issues.

Shutter speeds on the bottom don't display altered values, goes shutt-> shutter.
Also sometimes it misses and you get a flicker... not so much on LCD only see it on my CRT. I have refresh rate set too high for the camera on there I think.
Title: Re: [DONE] Shutter speed fine tuning
Post by: starfish on April 16, 2013, 05:06:01 PM
We rented a 5D3 to give the shutter speed fine tuning a try, but now I realized that there there is a ML beta 5D3 (which works), but that the nightly builds are not compatible to the 5D3 yet. So right now there's no chance to try this feature on the 5D3?
Title: Re: Shutter speed fine tuning (Clear scan)
Post by: japanda on May 21, 2013, 06:23:38 AM
Technically possible only for 60D, 5D3, maybe also 600D and digic V cameras (via FRAME_SHUTTER_OVERRIDE). Maybe integrate it with the extreme shutter speed menu? (it uses the same mechanism).

For other cameras, FPS override is the only hope.

hi there. is there a chance this shutter speed fine tuning patch or FPS override will work on 550D? also, it sounds like shutter speed fine tuning is preferred over FPS override when dealing with OP's issue, is that right, or are they both viable solutions? thx
Title: Re: [DONE] Shutter speed fine tuning
Post by: mariano on May 27, 2014, 03:48:52 AM
Is there any way I can use this clear scan function on my 60d or is still in development?  Thank you.
Title: Re: [DONE] Shutter speed fine tuning
Post by: Audionut on May 27, 2014, 04:52:29 AM
Apart from the obvious [DONE] in the thread title, http://builds.magiclantern.fm/#/features