1 stop

Not quite sure how to put the title of this thread

Say for example, I adjusted the aperture by 1-stop from f/5.6 to f/8.0, and then I adjusted the shutter speed from 1/125th sec to 1/60th, does that mean
a) I have adjusted the exposure by 2-stops
or
b) I have cancelled out the stop of the aperture?

Again, I do apologise about the lack of understanding about the 1-stop procedure, I have had a kind of an epiphany in the aperture understanding

B) You've cancelled out the stop of the aperture, and effectively adjusted nothing.

Cool, thanks for that, if you don't mind adding to that

Neither

You have stopped down by one stop. f5.6 to f8.0.

However, in order to maintain a correct exposure, you have been required to adjust your shutter speed.

Thanks, I think now it is getting clearer to understand

You may have changed how the two images would look. But, you haven't changed your exposure value - so the the lighting should look the same in before and after images. However, you've increased your DOF (5.6 to 8.0) and have allowed more movement blur (1/125 to 1/60).

+1 what Sued said .... you need to have a steadier hand at 1/60th ....

sued5320 wrote in post #10266744
You may have changed how the two images would look. But, you haven't changed your exposure value - so the the lighting should look the same in before and after images. However, you've increased your DOF (5.6 to 8.0) and have allowed more movement blur (1/125 to 1/60).

Thanks

TristanCardew wrote in post #10265848
B) You've cancelled out the stop of the aperture, and effectively adjusted nothing.

except depth of field

As others have said, you will have the exact same exposure, but now you've got a slower shutter speed (so more chance of blur) but more depth of field (so more things in focus).

Likewise say if you doubled your ISO from 400 to 800, to maintain the same exposure you would have to either double your shutter speed OR stop your aperture down by 1 stop.

Hope this helps

400dabuser wrote in post #10265798
Not quite sure how to put the title of this thread

Say for example, I adjusted the aperture by 1-stop from f/5.6 to f/8.0, and then I adjusted the shutter speed from 1/125th sec to 1/60th, does that mean
a) I have adjusted the exposure by 2-stops
or
b) I have cancelled out the stop of the aperture?

Again, I do apologise about the lack of understanding about the 1-stop procedure, I have had a kind of an epiphany in the aperture understanding

Here's a good way to get a handle on corresponding exposure settings:

- set your camera to P mode
- adjust the "program shift" knob while watching the aperture and shutter speed in your viewfinder.

Don't worry if you're an "M" purist - you don't have to shoot. Just look at the settings.

number six wrote in post #10267629
Here's a good way to get a handle on corresponding exposure settings:

- set your camera to P mode
- adjust the "program shift" knob while watching the aperture and shutter speed in your viewfinder.

Don't worry if you're an "M" purist - you don't have to shoot. Just look at the settings.

Can you explain what is program shift is?

400dabuser wrote in post #10267763
Can you explain what is program shift is?

Page 52 of the user manual for your 400D.

krb wrote in post #10267804
Page 52 of the user manual for your 400D.

How about the 50D?

Program shift works the same way on all cameras so it doesn't matter whcih manual you look at.