HDR/Bracketing - Shutter/Aperture/ISO

Started 4 months ago | Discussions thread
Bill Ferris
Bill Ferris Veteran Member • Posts: 7,493
Re: HDR/Bracketing - Shutter/Aperture/ISO

sakibnaz wrote:

Hi there ... generally we do HDR/backing by changing ShutterSpeed. What are the use-case of Bracketing by ISO or Aperture?

Will it be useful doing Bracket by blending ... like Under-expose by Shutter and Over-Expose by ISO?

STOP -1 (Adjusted by Shutter Speed)
STOP 0 (Base Exposure)
STOP +1 (Adjusted by ISO)

Exposure is the same in your base and +1 shots. You've not overexposed the +1 shot. It's made using the same exposure by ids rendered 1-stop lighter.

Any benefit of it?

In my experience, ISO bracketing is of limited usefulness. It doesn't offer any improvement to raw image quality, which is largely determined by the total light used in the making of a photo. ISO has no direct influence on that. It's the amount of light available in the scene, f-stop, and shutter speed that determine how much light is captured during a shutter actuation.

Exposure remains constant in a set of photos bracketed by ISO. In most circumstances, a photo made at a certain ISO and selectively lightened in post will look no different from a blended set bracketed by ISO. F-stop bracketing might have some usefulness in creating a composite image having a deep depth of field. That goal can also be achieved by using the same settings, focusing at different distances within the frame, and blending the resulting images.

I've read a few posts by folks who shoot ISO bracketed sets because of a workflow preference over processing a single image. Hey, if a person prefers one workflow over another and gets good results, by all means, use the workflow of your choice.

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Bill Ferris Photography
Flagstaff, AZ

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