multiple exposure


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xcess

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Nov 25, 2007
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#1
Hi all,
Would like to know if the Canon 40D, 400D and 450D has multiple exposure function?
Thanks...
 

J-Chan

Senior Member
Sep 21, 2005
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#2
not natively, ie. photoshop.. they don't have it as an in-camera function..
 

sin77

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Nov 28, 2004
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#3
i think u meant auto-bracketing?

most dslr will have
 

calebk

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Jul 25, 2006
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Clementi
#5
Read your manual. Look for terms such as "Bracketing", "Auto Exposure Bracketing", and/or "AEB".
 

sytan81

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Mar 13, 2008
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Yio Chu Kang
#8
you use it when you're not sure if the exposure settings are good or not.. what it does is to take a few photos with different EVs.. saves you the trouble of performing exposure compensations manually.. you can then decide which ones you want to keep.. it is also useful for creating HDR images..
 

SoulXion

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Apr 17, 2008
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#9
I know that we can use photoshop to combine a few photos together with different exposure settings but photoshop is exp;p
anyone got any recommendation for others cheap or free software to do it?

Can any camera in the market do the combine of photos by itself after the photos are taken?
 

n0eln0el

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Nov 4, 2007
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#10
you use it when you're not sure if the exposure settings are good or not.. what it does is to take a few photos with different EVs.. saves you the trouble of performing exposure compensations manually.. you can then decide which ones you want to keep.. it is also useful for creating HDR images..
can we skip this step if we are taking in RAW mode? since we can change the exposure later on..
 

Yapster

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Aug 12, 2006
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#11
I think TS is asking about the Multiple Exposure function which automatically merged 3 shots (need not be of different exposure, so nothing to do with bracketing) to produce a single shot. This kinda comes in handy for creative effects. And of course, you can use PS to do it.

Just 1 Example here

You can do rotary effect with it too. :)
 

Yapster

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#12
I know that we can use photoshop to combine a few photos together with different exposure settings but photoshop is exp;p
anyone got any recommendation for others cheap or free software to do it?

Can any camera in the market do the combine of photos by itself after the photos are taken?
D80 has this function. I am not sure about the rest. Only troublesome thing, once you set it, and after the 3-5 shots, you need to set again in menu for your next round. :confused:
 

Zeddy

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Apr 5, 2007
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#13
D80 has this function. I am not sure about the rest. Only troublesome thing, once you set it, and after the 3-5 shots, you need to set again in menu for your next round. :confused:
I only tried this once. Have to shoot in raw mode. Jpeg not supported.
 

AsPiRiN92

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Mar 13, 2007
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Toa Payoh
#14
don't worry its not a stupid qn :)

i'm not sure what other uses it has either, but i use it to get different exposures for generating HDR images for sunrise/sunsets, and also to get even exposures for various elements in a photo. you can set the AEB to +2 and -2, or +1 and -1, and then take 3 shots simultaneously. it will give you the 3 different exposures without you having to manually adjust your shutter/iso/aperture.
 

sytan81

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Mar 13, 2008
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Yio Chu Kang
#15
can we skip this step if we are taking in RAW mode? since we can change the exposure later on..
you mean for HDR images?

Not really. Your RAW file contains data captured by the sensors for only one exposure. The total dynamic range you can reconstruct from one photo converted with different exposure settings can never be more than the dynamic range captured by your camera, and this is rather limited.

When you are using only one exposure to capture the scene, your RAW file is already your HDR image.

Converting the RAW file to images with different exposure levels is a bit like slicing the dynamic range of the RAW into several parts. Combining the parts back into an HDR image will at best re-produce the dynamic range of the initial RAW file.

That said, if you are using a good RAW converter to derive fake exposures from a single RAW file, you will probably notice that the HDR image created from the fake exposures shows more dynamic range than the pseudo-HDR image obtained by converting the single RAW file directly. This is because your RAW converter includes a good noise reduction function, and this has an important effect on the dynamic range. You RAW converter may also include the ability to continue to retrieve highlights details when one or two of the color channels have already reached saturation.

So, a good RAW converter includes functions designed to optimize the dynamic range retrieved from the raw sensor data, but this does not change the fact that the dynamic range of a RAW file is limited to one exposure only. Unless the dynamic range of your scene is low, you will need to take more than one exposure to create an HDR image of the scene.

Source
 

May 8, 2008
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#16
don't worry its not a stupid qn :)

i'm not sure what other uses it has either, but i use it to get different exposures for generating HDR images for sunrise/sunsets, and also to get even exposures for various elements in a photo. you can set the AEB to +2 and -2, or +1 and -1, and then take 3 shots simultaneously. it will give you the 3 different exposures without you having to manually adjust your shutter/iso/aperture.
Thank you... that was very helpful.... i actually spent quite abit of time doing the manual adjustment during my last Phuket trip and ended with not many sunset photos....... ! :confused:

Definitely something I will try next time i take sunrise/sunset! :)
 

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