AEB Settings explained Confused?

[Para9111]

I have a difficult time understanding clearly the relation between the 2 AEB settings on my Canon 40D.I spent the last hour reading all the articles on AEB and my manual and books I have on my camera.When I set AEB on my camera I set +-2 stops between each shot and I have it defaulted to take the shots at 1/2 stop increments.Correct my terminology if wrong.Here's where I get confused.If each shot is 2EV apart how can they be 1/2 step increments apart as well?I think Im getting the terms all confused.More importantly can someone provide examples of how a photo can be incremented 1/2 step and be +2 EV.

[inkista]

The 1/2 vs. 1/3 stop increments isn't for AEB, it's how your meter/settings behave. I'd actually recommend sticking with 1/3 stops. The only folks who are going to want to use 1/2 stops are old film shooters who are used to having 1/2 step detents on their aperture rings.

[RichardTaylor]

The increments are 1/2 or 1/3 stops however you can only have one AEB setting in the range of +- 1/3 to +-2 F stops

[Para9111]

Ok so the AEB setting in the menu which uses a slider the little notches there are then changed by the 1/2 1/3 setting in the CFNII to represent either 1/3 or1/2 a stop.Is this how to intrepret it? So then what does each little notch represent going outward on the slider?Thank you for those willing to help Im sure this is all very easy to understand.I think Im starting to understand what your getting at.

[RichardTaylor]

If you have set the metering to 1/3 F stop then each "dot" represents 1/3 of an F stop. Otherwise each "dot" represents 1/2 F stop if you have set the metering for 1/2 F stop. The AEB scale changes to reflect the metering setting.

I always use 1/3 stops, however when using AEB I find that only 1/3 of a stop doesn't reallly make much difference. I tend to use 2/3 at the very least.

[inkista]

Kinda. It's not so much what the notches represent, as where the "needle" will stop on the notches. If you're using 1/2 stops, you'll sometimes note that two of the notches will light up simultaneously. The scale is marked out by 1/3 stop increments, which is why I recommend you just cave and use the default. Everything these days is set to 1/3 stop/EV intervals: aperture, iso, shutter speed, and flash power.

[Para9111]

So does it go -1/3 -2/3 -1 -11/3 -12/3 -2 stops going outward from norm exposure negatively and the same the other way positive? Assuming u selected 1/3 in CFN II ???

[RichardTaylor]

yes it does

[prabbit237]

Originally Posted by Para9111

Here's where I get confused.If each shot is 2EV apart how can they be 1/2 step increments apart as well?

Seems to me that basically, everyone's answering half of the question and not the other half.

When you set the steps to 1/3 or 1/2, yes, as you adjust the exposure for any one shot, it goes up and down by 1/3 or 1/2 step at a time. So you can set it to 0 for normal or go to 1/3, 2/3, 1, etc for a brighter shot and -1/3, -2/3, -1, etc for a darker shot (or ...-1, -1/2, 0, +1/2, +1... for 1/2 steps.)

When you set the bracketing to +-1 or +-2 or +-1-2/3, etc. then it will take 3 shots total. It will do one at your initial setting and then one each at the + and the - offsets. So if you set the regular exposure to, for example, -1-2/3 and set the +- to 2-1/3, then the first shot is at -1-2/3, the 2nd is at -1-2/3 + 2-1/3 or +2/3 and the 3rd is at -1-2/3 - 2-1/3 or -4 (if I did my math right.)

At least that's how I understand it all to work.

[Para9111]

You guys are great thank you.I finally have a grasp on how it works it was really bugging me.I can't wait to explore the rest of this forum.