Magic Lantern Forum

General Discussion => Academic Corner => Topic started by: garry23 on February 06, 2018, 11:26:55 PM

Title: Optimised strategy for hand held exposure bracketing
Post by: garry23 on February 06, 2018, 11:26:55 PM
Some may be interested in my latest experiments, all using ML of course!

http://photography.grayheron.net/2018/02/optimised-strategy-for-hand-held.html
Title: Re: Optimised strategy for hand held exposure bracketing
Post by: a1ex on February 07, 2018, 04:44:03 PM
TLDR:

Paper: hasinoff-hdrnoise-2010.pdf (https://people.csail.mit.edu/hasinoff/pubs/hasinoff-hdrnoise-2010.pdf) (TLDR there: figure 4)

In ML:
- Enable bracketing, large EV step (say 5 stops), ISO shifting: Full, sequence 0++ (important)
- start at the exposure for highlights (e.g. 1/8000 ISO 100, or whatever Auto ETTR suggests)
- set max auto ISO limit in Canon menu (e.g. 3200)
- run the bracketing sequence

For the above numbers, this will give the following sequence:
1/8000 ISO 100
1/8000 ISO 3200
1/250 ISO 3200
1/8 ISO 3200
4" ISO 3200
...

Will explain the theory later. While it's by no means an optimal sequence in the sense described in the paper, I believe the above settings will give a very good approximation, so I'd definitely recommend giving it a try, even if the total exposure time is not an issue.

For hand-held bracketing, I'd recommend researching this idea (https://www.magiclantern.fm/forum/index.php?topic=19315.msg182338#msg182338) (gap-less exposures, technically possible, just didn't look too much into it).
Title: Re: Optimised strategy for hand held exposure bracketing
Post by: garry23 on February 07, 2018, 05:55:50 PM
@a1ex

Thanks for the ‘gapless’ Link, I need to look deeper into that to understand it, ie 360 degree shutter etc.

As I said in my post, my initial interest is to see if I can find the best handheld bracketing strategy.

Cheers

Garry