Magic Lantern Forum

Using Magic Lantern => Raw Video => Topic started by: Steve Kahn on November 18, 2013, 11:15:20 PM

Title: ETTR for video
Post by: Steve Kahn on November 18, 2013, 11:15:20 PM
I would like to use the ETTR module for exposing for video but the problem is that it changes the shutter speed. 

I thought I could overcome this by setting the minimum shutter speed to 1/48th of a second but that is not a choice in the settings box (either 1/43rd or 1/63rd).

ETTR would be a great way to get a quick rough exposure setting for video if it left the shutter speed alone and just affected ISO and aperture.
Title: Re: ETTR for video
Post by: RenatoPhoto on November 19, 2013, 12:37:54 AM
On 5D3 you can adjust the shutter to 1/48
In Exposure Menu set your shutter as close as possible to 1/48
Set Exposure Override ON
In Video Menu go to Image Finetuning
and change shutter fine-tuning to adjust your shutter precisely.

I usually set the lowest shutter speed in Auto ETTR so it does not go below 1/44 (actually 1/48) and if you want to change this via scroll wheel you can set Link to Canon shutter ON.
I mostly use Auto ETTR always ON so during mettering I can change the f stop if the shutter moves up.  Once you press record the the ISO, f-stop, and shutter remain fixed.
Title: Re: ETTR for video
Post by: timetraveller on November 19, 2013, 04:06:51 AM
I mostly use Auto ETTR always ON so during metering I can change the f stop if the shutter moves up.  Once you press record the the ISO, f-stop, and shutter remain fixed.

I use the DoublePress Shutter button option. It works better for me, I can choose the area of the frame I want to expose for (i.e. face/body of actor), and then recompose for the actual shot without the exposure being afected afterwards. This works very good for me when I want to ignore some highlights of the shot, so they're not considered when calculating the exposure.

Thanks for the post Renato, it's been very helpful, I didn't know the Finetuning option for getting exact 1/48!
Title: Re: ETTR for video
Post by: jose_ugs on November 19, 2013, 12:30:42 PM
In situations like these, how much should you worry about your ISO jumping up to 12800?
Title: Re: ETTR for video
Post by: Steve Kahn on November 19, 2013, 07:41:22 PM
Thank you RenatoPhoto!  Perfect!
Title: Re: ETTR for video
Post by: Danne on November 19, 2013, 09:32:19 PM
Very useful tip RenatoPhoto, thanks