20D AEB

[emru]

3 days with my 20D and I'm still in love. When I set AEB it brackets speed only, how do I bracket aperture? I am using PC terminal for studio strobes, setting CZ on M. Bracketing speed is a waste.

[DocFrankenstein]

You can't bracket aperture with 20D I think...

For sure, you can't bracket aperture with PC strobes.

Why do u need to bracket aperture anyway?

[emru]

I couldn't find a way to bracket aperture either, but page 84 in 20D manual states "By changing the shutter speed or aperture automatically, the camera brackets the exposure etc." It also says on page 85 " neither flash nor bulb exposures can be used with AEB". But I am able to AEB with shutter speed conected to PC Terminal. Why to bracket or not to bracket? Gets three files for the best exposure, then proceed with a lot of production shots.

[DocFrankenstein]

It doesn't seem that you understand what you're doing with your strobes. :confused:

[robertwgross]

Try Tv mode, and use Auto Bracketing. See what happens?

Now shift over to Av mode, and use Auto Bracketing. See what happens (differently)?

---Bob Gross---

[dhbailey]

I can understand why the camera would bracket with shutter speed rather than aperture -- the shutter speed can always be changed (well, usually -- if you're at either extreme it can't be bracketed either) since it's a function of the camera itself. The aperture may very easily not be bracketable, depending on how you are setting up your exposure. If you're original shot is with the lens fully stopped down or fully open, there isn't a possibility of bracketing one stop further in that direction. Rarely will the shutter speed be at either extreme when a person want's AEB, so there is much more room for the camera to do its thing.

Also, bracketing with aperture will change the depth of field more than bracketing with shutter speed will, so the picture would change more than just exposure if the aperture were changed.

These are just idle thoughts on a Saturday morning and may be totally off-base, but they seem logical to me.

[JoeTampa]

I agree with DHBailey. Adjusting the shutter speed affects only the exposure. Adjusting the aperture adjusts the DoF; I can't imagine why you'd prefer the latter over the former.

[scottbergerphoto]

I originally thought the question was odd as well untill I realized the poster was talking about studio lighting/manual flash. The shutter speed has no bearing on flash exposure, only on ambient exposure(as long as you stay under the X sync speed). In any kind of manual flash situation, the only camera setting (other then ISO) that will affect the flash is the aperture setting. Bracketing shutter speed is useless in this situation.
Scott

[DocFrankenstein]

Oh cool... I CAN bracket aperture!

Thanks scott!