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DPChallenge Forums >> Photography Discussion >> HDR - Shutter speed important?
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 05/25/2007 05:53:13 AM · #1
Is it important to set your camera for different shutter speeds as well as exposures settings? I was under the impression it was just exposure settings with the same ap and shutter speed...am I wrong?
 05/25/2007 06:03:37 AM · #2
By changing shutter speeds you are changing the amount of light only. By changing the f-stop, you would be changing the depth of field as well. I don't have a lot of experience with HDR but all the HDRs I have taken were done using shutter speed adjustments only.

Originally posted by heavyj:
Is it important to set your camera for different shutter speeds as well as exposures settings? I was under the impression it was just exposure settings with the same ap and shutter speed...am I wrong?
05/25/2007 06:04:46 AM · #3
...and when I hear bracketting, is that just setting the image up so that you can take 3 or more of the exact same shot?
 05/25/2007 06:07:44 AM · #4
Bracketing means taking the same shot at different exposures - typically by adjusting the shutter speed. To get a HDR to work you need a tripod and then set the camera up and take the exposures at different shutter speed settings.

Originally posted by heavyj:
...and when I hear bracketting, is that just setting the image up so that you can take 3 or more of the exact same shot?
05/25/2007 06:12:59 AM · #5
So would it be better for me to just take photos at different shutter speeds or to take them at the same speed but different exposure settings in the camera.
 05/25/2007 06:22:23 AM · #6
Originally posted by heavyj:
So would it be better for me to just take photos at different shutter speeds or to take them at the same speed but different exposure settings in the camera.

If you change either the shutter speed or aperture your changing the exposure settings. If you were in aperture priority and changed the exposure compensation what the camera does is keep the f/stop the same and speed up or slow down the shutterpeed to match. So the easiest way to record exposures for HDR would be to put your camera on a tripod in aperture mode and move the exposure dial up or down the exposures you want. I hope this is all correct :)
 05/25/2007 06:48:02 AM · #7
I always use aperture priority set the ASA and let the camera decide the shutter speed. That way I am in control of the DOF ... not the camera. Then I just bracket with exposure settings ... even +0.7, 0.0, and -0.7 can give interesting results but I usually bracket a little wider as in a full F stop or even more if I decide to spread it out over 5 images ...

Message edited by author 2007-05-25 06:50:48.
 05/25/2007 07:23:26 AM · #8
Originally posted by heavyj:
So would it be better for me to just take photos at different shutter speeds or to take them at the same speed but different exposure settings in the camera.


You ARE changing the "Exposure settings" when changing the shutter.
 05/25/2007 07:59:52 AM · #9
Do _NOT_ do HDR by changing the aperture. It has to be the shutter speed that changes. If the aperture changes, so does the image! (think Depth of Field) And if the image changes, then you're going to have a much harder time merging the images together to make an HDR image.

You want everything to stay as much the same as possible. So keep the camera on a tripod. Use a shutter release. And make sure your lens is in manual mode (so it doesn't accidentally change focus from one from to the next). And, as I said, make sure the aperture stays the same.

Message edited by author 2007-05-25 08:01:13.
 05/25/2007 08:35:58 AM · #10
Originally posted by dwterry:
Do _NOT_ do HDR by changing the aperture. It has to be the shutter speed that changes. If the aperture changes, so does the image! (think Depth of Field) And if the image changes, then you're going to have a much harder time merging the images together to make an HDR image.

You want everything to stay as much the same as possible. So keep the camera on a tripod. Use a shutter release. And make sure your lens is in manual mode (so it doesn't accidentally change focus from one from to the next). And, as I said, make sure the aperture stays the same.


Good point.
 05/25/2007 08:45:02 AM · #11
I think heavyj may be slightly confused. I keep seeing him use "exposure setting" as if it's synonymous with aperture.

Exposure is a combination of shutter speed and aperture and ISO.

Just hoping to clear that up. Someone else feel free to explain it better than I have. I just woke up.
 05/25/2007 08:59:19 AM · #12
Originally posted by Greetmir:
I always use aperture priority set the ASA and let the camera decide the shutter speed. That way I am in control of the DOF ... not the camera. Then I just bracket with exposure settings ... even +0.7, 0.0, and -0.7 can give interesting results but I usually bracket a little wider as in a full F stop or even more if I decide to spread it out over 5 images ...


Set the ASA.... lmao greetmir your getting old lol. And to think we used to play the same computer game together!
 05/25/2007 09:22:55 AM · #13
ASA, ISO it's all the same.
 05/25/2007 09:26:03 AM · #14
Originally posted by tooohip:
ASA, ISO it's all the same.


ASA isn't PC anymore ;-)
 05/25/2007 09:27:58 AM · #15
Originally posted by fotomann_forever:
ASA isn't PC anymore ;-)


I'll be sure to use it in place of ISO then often... ;-)
 05/25/2007 11:22:53 AM · #16
Originally posted by fotomann_forever:
I think heavyj may be slightly confused. I keep seeing him use "exposure setting" as if it's synonymous with aperture.

Exposure is a combination of shutter speed and aperture and ISO.

Just hoping to clear that up. Someone else feel free to explain it better than I have. I just woke up.


No. There's a button on the D80 that I hold down and use the dial to slide the meter across however far to the left or right. That's what I mean. The Aperture and shutter speed stay the same though...am I missing something?
 05/25/2007 11:48:49 AM · #17
Originally posted by heavyj:
No. There's a button on the D80 that I hold down and use the dial to slide the meter across however far to the left or right. That's what I mean. The Aperture and shutter speed stay the same though...am I missing something?

That would be Exposure COMPENSATION. It will work similarly to using braketing. The thing I find with braketing is that (with the D50 at least) I have to go through a menu. Bleh! Plus I always forget to count off my 3 exposures for the bracketed set. It's easier for me to set -1 or -2. Snap. Set 0. Snap. Set +1 or +2. Snap. I'll never forget which shot I'm on. "EC is 0? I just took the second shot. Ok. Next is..."
 05/25/2007 12:01:04 PM · #18
I think I'm tired, but maybe I'm missing something. Is it possible by bracketing, that you can sit there with the camera (However it's done) so that it automatically takes 3 or however many pictures at different exposures without touching anything else...just snap snap snap?
 05/25/2007 12:04:12 PM · #19
Originally posted by heavyj:
I think I'm tired, but maybe I'm missing something. Is it possible by bracketing, that you can sit there with the camera (However it's done) so that it automatically takes 3 or however many pictures at different exposures without touching anything else...just snap snap snap?


Some camera's have a 3 and or 5 shot bracket mode/seting. My fathers Fuji S series does. Some dSLR's do probly alot.

On Point and Shoots some do some done i end up shooting ev -1 ev 0 ev +1 or something like that. EV Compensation modifies the shutter speed it would normally use to provide a correct exposure to that it would use to expose a bit darker or a bit brighter.
 05/25/2007 12:10:24 PM · #20
Originally posted by heavyj:
I think I'm tired, but maybe I'm missing something. Is it possible by bracketing, that you can sit there with the camera (However it's done) so that it automatically takes 3 or however many pictures at different exposures without touching anything else...just snap snap snap?

You have to put the camera into Bracket MODE which can either be a button or a menu item. Some cameras allow for continuous shot while bracketing, but you have to count the shutter snaps to know when the set is done. The cameras that don't do continuous you snap one time for each exposure of the bracket. 3 shutter pressses for a 3 exposure bracket.
 05/25/2007 12:15:02 PM · #21
OK...so I guess I'm gonna have to check out the D80 manual. Thanks!
 05/25/2007 12:18:17 PM · #22
I would highly recommend finding a local beginning photography course as it sounds like you could really benefit from it.

Changing shutter speed, aperture settings, all change the "exposure setting."
 05/25/2007 12:21:24 PM · #23
In Japan...nah!! I'll learn. I understand the basics. I'm just trying to figure out how to apply it all to HDR images. I see some beautiful shots and of course anything I produce is crap...so far.
 05/25/2007 12:35:42 PM · #24
Originally posted by heavyj:
In Japan...nah!! I'll learn. I understand the basics.


Well, exposure and how you achieve it, is the basics and it seems you might be a bit confused there. ;-)

Either way, just know that when you change the shutter speed, light has more or less time to enter the lens. Less time to enter (higher shutter speed), means less "exposure." More time to enter (longer exposure) means more "exposure."

When it comes to aperture, a wider (lower f/#) means more light enters, thus more "exposure." A narrower (higher f/#) means less light can enter, meaning less "exposure."

Now, to archive the results you are after, you can use a combination of both, or just one or the other to modify your "exposure" settings.

Hope that makes sense.

Message edited by author 2007-05-25 12:35:52.
 05/25/2007 12:36:39 PM · #25
Key points:

1. In order to change exposure, you must change shutter speed, aperture, or both.

2. In shutter-priority OR aperture-priority mode, changing the relevant parameter won't change the exposure because the other parameter will adjust to compensate. In other words, if you have camera set in shutter-priority and have selected 1/125 as your shutter speed, the camera may give you (say) f/8. Change speed to 1/60, camera will give you f/11. Change it to 1/250, camera will give you f/5.6. The EXPOSURE won't change, just the the equivalent settings.

3. Therefore, if you are shooting in either priority mode, and you want to manually "bracket" your exposures, you need to use the "EV Compensation" function, which will over-and/or under-expose the bracketed images by changing whichever variable is NOT the mode you are in.

4. Since DOF changes with aperture, for HDRI imaging from multiple exposures you need to fix the aperture by using aperture-priority mode. You select your aperture, and when you do exposure compensation for the bracketed exposures it will change your shutter speed.

5. Alternatively, you can use aperture-priority as above and use your menu to select the auto-bracketing mode. You tell it how much to bracket by, and how many to bracket, and each time you press the shutter it will do a series of exposures, all at the same aperture, at different shutter speeds.

6. Finally (and this is the way I usually do it) you can work in full manual mode and use the little "light meter bar" in the viewfinder to set your exposures by rotating the shutter speed dial, leaving the aperture at the same size for all exposures in the series. For me, this is the easiest way to work HDRI. However, if you are shooting a scene for HDRI where speed is important (clouds are moving fast, say) then the auto-bracket mode can do the same thing more quickly, so sometimes I do that.

R.
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