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Thread started 29 May 2010 (Saturday) 03:39
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RichSoansPhotos
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May 29, 2010 03:39 |  #1
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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




  
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TristanCardew
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May 29, 2010 04:00 |  #2

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


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RichSoansPhotos
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May 29, 2010 04:01 |  #3
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Cool, thanks for that, if you don't mind adding to that




  
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DunnoWhen
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May 29, 2010 04:06 as a reply to  @ RichSoansPhotos's post |  #4

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.


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RichSoansPhotos
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May 29, 2010 04:17 |  #5
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Thanks, I think now it is getting clearer to understand :)




  
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May 29, 2010 09:51 |  #6

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).


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May 29, 2010 10:37 |  #7

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


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RichSoansPhotos
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May 29, 2010 10:51 |  #8
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sued5320 wrote in post #10266744 (external link)
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




  
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images ­ by ­ Paul
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May 29, 2010 12:55 |  #9

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

except depth of field




  
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JoYork
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May 29, 2010 14:02 |  #10

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 :)


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number ­ six
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May 29, 2010 14:10 |  #11

400dabuser wrote in post #10265798 (external link)
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 :shock:
- 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. :cool:


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RichSoansPhotos
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May 29, 2010 14:51 |  #12
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number six wrote in post #10267629 (external link)
Here's a good way to get a handle on corresponding exposure settings:

- set your camera to P mode :shock:
- 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. :cool:


Can you explain what is program shift is?




  
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krb
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May 29, 2010 15:01 |  #13

400dabuser wrote in post #10267763 (external link)
Can you explain what is program shift is?

Page 52 of the user manual for your 400D.


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RichSoansPhotos
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May 29, 2010 15:07 |  #14
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krb wrote in post #10267804 (external link)
Page 52 of the user manual for your 400D.


How about the 50D?




  
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krb
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May 29, 2010 15:08 |  #15

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


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