Aperture bracketing?

Dear experts,

I know about exposure bracketing and how it automatically shoots 3 pictures in rapid succession with various exposures.

Is it possible to do aperture bracketing? I want to shoot 3 pictures rapidly by changing the aperture. I want to experiment on various depth of fields, but I don't want to change aperture settings manually and then have to recompose, refocus and shoot, which takes a long time. In a zoo environment, by the time you adjust and readjust your camera settings, the animal walks away and the moment is lost.

Generally speaking, is there any camera out there that allows the photographer to shoot a number of pictures by varying certain parameters such as aperture or ISO?
Another example: sometimes I want to take two pictures rapidly by

1. Minimizing ISO and still maintaining a maximum "safe" shutter speed of say 1/200s to freeze motion.
2. Then I want to shoot the same scene by maximizing ISO and shutter speed.

Thank you for your help.
Ali.

For aperture bracketing wherein the aperture changes, and shutter stays the same, I presume you just go into bracketing mode in Tv (shutter priority) mode. Set your shutter speed, and the bracketing by default will be of the aperture.

PicOne said:

For aperture bracketing wherein the aperture changes, and shutter
stays the same, I presume you just go into bracketing mode in Tv
(shutter priority) mode. Set your shutter speed, and the
bracketing by default will be of the aperture.

Click to expand...

that won't give what he really wants. Your method will adjust over exposure so of a a shot sequence 1 will be under exposed, 1 correctly exposed, 1 over exposed

What he wants is a setting that does say 1/250 f11, 1/500 f8, and then 1000 f5.6 , ie all correct exposure

PicOne said:

For aperture bracketing wherein the aperture changes, and shutter stays the same, I presume you just go into bracketing mode in Tv (shutter priority) mode. Set your shutter speed, and the bracketing by default will be of the aperture.

Click to expand...

I already tried this on the EOS 30D. This technique changes the exposure and it makes one picture lighter and another one darker. This is still exposure bracketing and not really aperture bracketing.

A true aperture bracketing will change both the aperture and the shutter speed to maintain the same overall exposure. The end result will be 3 pictures which are all identical in every way, except their depth of field.

But I guess if I shoot in raw and use your technique, then I can adjust the brightness later on. So your idea will work.

However, my question still stands. Is it possible to program any of the EOS-ID series cameras to shoot several pictures in rapid succession and have the camera change certain settings (like ISO, aperture) for each picture, instead of the photographer having to make those changes manually for each and every shot?

Thanks for your help.
Ali.

mortimer hill said:

PicOne said:

For aperture bracketing wherein the aperture changes, and shutter
stays the same, I presume you just go into bracketing mode in Tv
(shutter priority) mode. Set your shutter speed, and the
bracketing by default will be of the aperture.

Click to expand...

Click to expand...

mortimer hill said:

that won't give what he really wants. Your method will adjust over
exposure so of a a shot sequence 1 will be under exposed, 1
correctly exposed, 1 over exposed

What he wants is a setting that does say 1/250 f11, 1/500 f8, and
then 1000 f5.6 , ie all correct exposure

Click to expand...

Then do it in P. Either autobracketing or simply use program shift.

ali20 said:

However, my question still stands. Is it possible to program any
of the EOS-ID series cameras to shoot several pictures in rapid
succession and have the camera change certain settings (like ISO,
aperture) for each picture, instead of the photographer having to
make those changes manually for each and every shot?

Click to expand...

There is no way to do that automatically.

I'm not sure if this is what your looking for but try looking at
http://forums.dpreview.com/forums/read.asp?forum=1032&message=21924490
--
Austin Computer Speciailists
info-at-austincs-dot-com

I don't think any cameras do this. But it definitely would be nice.

not sure if i'm not understanding what you want to do....from my understanding of it, if you want it to be done completely automatically than i don't think it's possible...

but what you want is a simple scroll of the dial while shooting on aperture priority.... that is, compose and focus for your first shot, keep your finger half pressed and change the aperture and click again...

the camera will adjust the shutter automatically to give you the "proper desired" exposure while you shift the aperture to what you want it to be and at the same time maintaining the same focus point and composition....

granted, this is not completely automatic like exposure bracketing but should meet what you want to do unless your composition is really precise and cannot afford to have any slight movements....

--
http://www.overexposed.com.au