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Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.

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Old September 4th, 2012, 05:20 PM   #1
Major Player
Join Date: Jun 2007
Location: Manchester England
Posts: 435
Magic Lantern Sunrise


I am trying to shoot a sunrise time lapse and am really struggling with flicker. I am using the latest version of ML and tried using AV mode but that had flicker I switched to all manual with Bump Remap and now I am getting random images which are really bright. My settings are

Lens is set to 2.8 manual mode, 16-35mm Canon L Lens
Camera set to M mode
Intervalometer is set to 2 seconds
Bulb/Focus set to sunrise
Max Ramp speed set to 0.050

Expo menu set to ISO 1600
Shutter 1/25

Photo Album - Imgur every 5 - 8 frames a picture is brighter than the rest. I have uploaded 7 images here. The first is bright and so is the 5th

Any reason for this?
Tariq Peter is offline   Reply With Quote
Old September 4th, 2012, 07:12 PM   #2
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Join Date: May 2006
Location: Camas, WA, USA
Posts: 5,458
Re: Magic Lantern Sunrise

You say the lens is at f/2.8. You might double check this. The one reason I've experienced flicker is when the lens is stopped down. Since the aperture opens and closes for each photo, the aperture changes slightly from image to image. The solution I use (with an intervalometer and not with ML) is to set the aperture, push the DOF Preview button, and partially untwist the lens. That guarantees that the aperture is fixed.

Aside from that, I don't know of any reason for flicker, aside from a possible ML bug. It could be a multitasking thing - it always works perfectly, except when it doesn't. :)
Jon Fairhurst
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Old September 5th, 2012, 11:22 AM   #3
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Join Date: Jul 2010
Location: Vernon, BC. Canada
Posts: 111
Re: Magic Lantern Sunrise

Have a look at the user guide again to see if the suggestions help. For example:

Maximum ramping speed: this parameter is used for computing the optimal smoothness factor. A lower value will reduce flicker, but if the value is twice as low as the real rate of brightness change, ML will lose the ability to ramp correctly. For example, if you set a maximum ramping speed of 0.1 EV / shot, and the scene requires a ramping of 0.2 EV / shot, ML will start flickering heavily.
The user guide is here:
userguide [Magic Lantern wiki]

About 2/3rds of the way down the page is advice for controlling flicker in the QuickStart section in points 4 and 5.

Just reading the part I quoted and looking at your settings it might be that your ramping speed is too low. I haven't experimented with ramping yet so sorry if I'm sending you down the wrong path.

Let us know what you discover. Info is tough to find on some of the more advanced functions of ML and it will help others if you tell us what you figure out.
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