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Exposure Compensation
Please excuse my ignorance, but I am having a difficult time understanding how the Exposre Compensation on my camera works. I have a Nikon D40X and have been playing around with HDR photography. Does changing the Exposure Compensation have the same effect on a picture as changing the shutter speed?.

In terms of HDR photography, would I get the same result if I shot 3 shots with 3 different Exposure Compensation values, as if I took 3 shots with 3 different shutter speeds?.

My Pics: http://picasaweb.google.com/hotelfive..

Comments (11)

I don't know what HDR is. I think the EV is another way to control, iso, shutter speed or aperture. it might change one of these of all of these..

Comment #1

Why not experiment?.

Put the camera on a tripod, so that it is pointed at the same ight for the whole test, and just look through the viewfinder and see what changes when you adjust the exposure compensation settings..

With my Canon set on P for Program, adjusting the exposure compensation changes the shutter speed a little, then the aperture a litlle, then the shutter speed some more, and then the aperture some more..

BAK..

Comment #2

Hotelfive wrote:.

Please excuse my ignorance, but I am having a difficult timeunderstanding how the Exposre Compensation on my camera works. Ihave a Nikon D40X and have been playing around with HDR photography.Does changing the Exposure Compensation have the same effect on apicture as changing the shutter speed?.

It depends on what mode you're in:.

-If you're in aperture priority, exposure compensation will change shutter speed.-If you're in shutter priority, exposure compensation will change the aperture.-If you're in P or auto mode, the camera will decide.-If you're in manual, there is no exposure compensation!..

Comment #3

Thanks so much guys, that clarified everything....I was kind of figuring that out through playing with it, but now I know!.

Thanks!My Pics: http://picasaweb.google.com/hotelfive..

Comment #4

New_type wrote:.

I don't know what HDR is. I think the EV is another way to control,iso, shutter speed or aperture. it might change one of these of allof these.

I think it dangerous for those whose recent posting history reveals that they do not yet understand photography to advise others..

Chris Elliott.

*Nikon* D Eighty + Fifty - Other equipment in Profile.

Http://PlacidoD.Zenfolio.com/..

Comment #5

I think it was a misunderstanding due to my bad english. you guys didn't seem to understand me..

Chris Elliott wrote:.

New_type wrote:.

I don't know what HDR is. I think the EV is another way to control,iso, shutter speed or aperture. it might change one of these of allof these.

I think it dangerous for those whose recent posting history revealsthat they do not yet understand photography to advise others..

Chris Elliott.

*Nikon* D Eighty + Fifty - Other equipment in Profile.

Http://PlacidoD.Zenfolio.com/..

Comment #6

Hotelfive wrote:.

Please excuse my ignorance, but I am having a difficult timeunderstanding how the Exposre Compensation on my camera works..

Exposure Compensation ... it is one of the most useful (essential) functions on your camera..

Let us start with basics .... You camera is designed to take photos of GRAY-cards ... (to be more specific, Kodak refers to them as 18% gray-cards)..

IF you take a close-up photo of that (18%) gray-card ... you camera will dutifully produce an exact duplicate 19% gray image. (or at least should).

So the world is all fine as long as you take photos of nothing but "gray" cards .....

BUT .... you say you don't want to only take photos of "gray" cards .... Then you got a problem buddy .... You say you want to take a photo of a WHITE card .... and a BLACK card..

(I suggest you get-a-life if all you are gonna take photos of are "cards" ... ).

But whatever .... THE POINT ... (and the "problem") is that your camera will ALWAYS produce a "GRAY" image ..... whether it be the correct Gray Card .... OR ALSO THE "WHITE" AND THE "BLACK" CARDS..

Maybe you realize that a gray image is OK and correct from the "gray" card ..... but obviously a "gray" image also from both the WHITE and BLACK cards was WRONG..

Now, in practice, instead of a "white" card .... lets say you are in SNOW (white not "yellow" I hope). You possibly can realize now that your "white" snow will image as GRAY. (Houston, we have a problem.).

(Likewise, if you photograph a Black CAT in a (black) COAL BIN .... your image will also be a "light" 18% GRAY instead of "black".).

Enter, Exp. Comp. IF you are in SNOW, changing to a +1 or +2 will change the gray into WHITE .... (but careful ... don't OVERDO it ... you will saturate and burn-out the image)..

Conversly, changing to a -1 or -2 will DARKEN the light-gray image of the black-cat-in-coal-bin..

Other applications can be Sunsets that are "supposed" to be very bright, but instead image too dark.OR .... lets say you have someone in the "shade" ... and the SUN is BEHIND them..

The metering system will be overpowered by the "bright" light behind the subject .... and your subject will render completely black, by changing to +2 or +3 .... you can lighten the face of your subject .... (albeit but probably the background will be completely washed-out .... you can't have everything)..

So the BOTTOM LINE is that the Exp. Comp can either LIGHTEN or DARKEN the image ..... (your mileage may vary)..

Thanks for reading .... JoePhoto.

( Do You Ever STOP to THINK and FORGET to START Again ??? )..

Comment #7

HDR=High Dynamic Range photographyto do hdr-.

If you put camera into full auto matrix metering, take first shot note fstop and shutter speed. put camera into full manual, see if camera still has the matrix fstop and shutter speed. if yes, then using shutter speed go up 2-4 shutter speeds 1 fstop worth of shutter speed at a time. the back to matrix shutter speed and go down same number of shutter speeds.this is on a tripod with cable release..

No, you should not use 1 raw shot and convert 1 stop up and down, because their is not enough dynamic range in the 1 raw shot. dynamic range is why we are doing this, hdr is trying to get all it can..

The group of shots can be raw or jpeg. if jpeg they can be used as is. if raw remember that you HAVE to batch process all 5-9 shots. this is because the pp has to be all the same on every pic. you cannot, for example make any attempt to get the shadow details of the group of raw pics, because that would require different amounts of pp, and you cannot do that with hdr. the pp for all shots has to be identical..

For me I just shoot them in jpeg and use them from the camera, that way they are all identical because the camera jpeg settings are the same for every shot. I also put my hand streched in front of the lens and take a check shot and when done take a ending shot with hand. this tells me where the hdr group is on my memory card when I transfer to the pc..

The only important item is to bracket using shutter speeds only. if fstops are used it changes dof between shots. and shoot enough shots, 5-9 is the optimum. the only other thought is to shoot a scene that deserves the the hdr technique, too many people are shooting hdr because it is new or different or whatever. many people are using hdr software on scenes that do not have enough dynamic range; they end up with images that have been enhanced by hdr software, they are not hdr images. the dynamic range was not in the scene to begin with.

This can be checked with a spotmeter on different areas. NOTE: use of auto bracketing on a camera may not work unless you know the bracketing is using the shutter speeds to bracket. in any event, you really need 5-9 shots for hdr; this is more than the auto bracket fcn on almost all cameras. and the bracketing has to be both sides of the middle shot. make you use enough brackets to cover the previously checked dynamic range.

And the scene should have no movement, if so the item will blur in the hdr image..

Do not adjust the focus. set the focus on infinity or use a hyperfocalsetup for focus..

Do not adjust the white balance for individual shots. go with awb or 1 setting and do not change it..

Remember, hdr was created and meant for scene that have a dynamic range that exceeds the dynamic range of the camera sensor, about 5-6stops. hdr with the required software allows the user to capture a scene that has very high dynamic range...

Comment #8

Hotelfive wrote:.

In terms of HDR photography, would I get the same result if I shot 3shots with 3 different Exposure Compensation values, as if I took 3shots with 3 different shutter speeds?.

I hesitate to answer yes or no .....

IF you were in "manual" exposure mode ... changing shutter speeds (or apertures) will change density. So a qualified YES since Exp Comp also results in changes in density of the image..

IF you are in an "auto" exposure mode ... NO ... only changing the Exp. Comp. setting would actually lighten or darken the image. (changing the shutter speed would result in the aperture "auto" changing to compensate and give you the same density as before the shutter speed change)..

My Pics: http://picasaweb.google.com/hotelfive.

Thanks for reading .... JoePhoto.

( Do You Ever STOP to THINK and FORGET to START Again ??? )..

Comment #9

Great explanations everyone, thank you so much!.

My Pics: http://picasaweb.google.com/hotelfive..

Comment #10

A more simplistic way to understand EV/exposure compensation is that the user is over riding what the camera's exposure meter calculates to be the optimal exposure. The camera does not know what the intended subject of the image is. It's light meter reads the metered area and calculates what the optimal exposure is for the area metered..

+EV tells the camera to add light to the image; -EV tells the camera to under-exposed/add less light to the image. Depending on the mode being used, it will change one of the unconstrained exposure variables - ISO/Shutter Speed/Aperture to effect the EV compensation adjustment setting.

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Http://www.nikonians-images.com/...hp?cat=500&ppuser=121399&password=.

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Comment #11

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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