Multiple exposures in DSLR´s._Why_not?

carlos

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Why DSLR´s don't take multiple exposures shots? Is there any technical
limitation, like, sensor overheating, excessive noise, .... ?

My question is about the fact I don't want to make multiple exposure by
software edition. I want know if it's impossible by a technical limit or
because the manufactures don't want it.

Thanks in advance,
--
gutto@iis.com.br

Carlos A. B. Coutinho
Rio de Janeiro, RJ
Brasil
 
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On Sat, 12 Feb 2005 17:19:23 -0200, Carlos <gutto@iis.com.br> wrote:

>Why DSLR´s don't take multiple exposures shots? Is there any technical
>limitation, like, sensor overheating, excessive noise, .... ?
>
>My question is about the fact I don't want to make multiple exposure by
>software edition. I want know if it's impossible by a technical limit or
> because the manufactures don't want it.


I guess nobody does it in-camera because it's
so trivial to do in Photoshop.

What is your objection to doing it in Photoshop?
Is it too easy? Do you want it to be harder?


rafe b.
http://www.terrapinphoto.com
 
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In article <420e624f@news.iis.com.br>, Carlos <gutto@iis.com.br> wrote:

> Why DSLR´s don't take multiple exposures shots? Is there any technical
> limitation, like, sensor overheating, excessive noise, .... ?

Yes - sensor noise accumulates. CCD sensors also overheat.

> My question is about the fact I don't want to make multiple exposure by
> software edition. I want know if it's impossible by a technical limit or
> because the manufactures don't want it.

You can use multiple flashes in a dark room or get a lens with a manual
shutter. Noise will accumulate while the sensor is active, resulting in
a photo that is inferior to photos merged in software.

> Thanks in advance,
 
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Carlos wrote:

> Why DSLR´s don't take multiple exposures shots? Is there any technical
> limitation, like, sensor overheating, excessive noise, .... ?
>
> My question is about the fact I don't want to make multiple exposure by
> software edition. I want know if it's impossible by a technical limit or
> because the manufactures don't want it.

It's possible.. There are a few cameras that will give you multiple
exposures, but no DSLRs I can think of.

AFAIK, it's done in the camera's firmware. You can't do multiple
exposures with a single sensor. Separate images are recorded to
memory then merged much the same as photoshop does.

I guess if there's enough demand, it may be a common thing.

I think Photoshop will always be the superior way to merge images.
You have a nice big monitor to do it on and you can precisely
control the opacity of the layers.
 
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Photoshop has taken the place of many things we used to do with film and
processing. Actually, you are "processing" your photos in Photoshop, using
many of the same techniques you used to use with film and chemicals. You
just don't have to turn out the lights to do it.


"Carlos" <gutto@iis.com.br> wrote in message
news:420e624f@news.iis.com.br...
> Why DSLR´s don't take multiple exposures shots? Is there any technical
> limitation, like, sensor overheating, excessive noise, .... ?
>
> My question is about the fact I don't want to make multiple exposure by
> software edition. I want know if it's impossible by a technical limit or
> because the manufactures don't want it.
>
> Thanks in advance,
> --
> gutto@iis.com.br
>
> Carlos A. B. Coutinho
> Rio de Janeiro, RJ
> Brasil
 
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Carlos <gutto@iis.com.br> wrote:

>Why DSLR´s don't take multiple exposures shots?

The Fuji S3 and Pentax ist-D both have multiple exposure capability.

--
Mark Roberts
Photography and writing
www.robertstech.com
 

Chris

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Carlos wrote:
> Why DSLR´s don't take multiple exposures shots? Is there any technical
> limitation, like, sensor overheating, excessive noise, .... ?
>
> My question is about the fact I don't want to make multiple exposure by
> software edition. I want know if it's impossible by a technical limit or
> because the manufactures don't want it.
>
> Thanks in advance,


My guess is once the shutter is closed, the data of each sensor cell
needs to be transfered out of the sensor immediately. Moreover, it's so
easy to combine pictures in Photoshop that this feature is not worth
considering to put in the camera.
 

carlos

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Because it take time to do it. Only this.
It's trivial in Corel PhotoPaint too, but I don't want to spend time to
do it.
In film cameras I didn't to do it. I only took a double exposure shot
and nothing more.

rafe bustin wrote:

> On Sat, 12 Feb 2005 17:19:23 -0200, Carlos <gutto@iis.com.br> wrote:
>
>
>>Why DSLR´s don't take multiple exposures shots? Is there any technical
>>limitation, like, sensor overheating, excessive noise, .... ?
>>
>>My question is about the fact I don't want to make multiple exposure by
>>software edition. I want know if it's impossible by a technical limit or
>> because the manufactures don't want it.
>
>
>
> I guess nobody does it in-camera because it's
> so trivial to do in Photoshop.
>
> What is your objection to doing it in Photoshop?
> Is it too easy? Do you want it to be harder?
>
>
> rafe b.
> http://www.terrapinphoto.com

--
gutto@iis.com.br

Carlos A. B. Coutinho
Rio de Janeiro, RJ
Brasil
 
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Carlos <gutto@iis.com.br> wrote:

> rafe bustin wrote:
[..]
> > What is your objection to doing it in Photoshop?
> > Is it too easy? Do you want it to be harder?
>
> Because it take time to do it. Only this.

If you have ImageMagick, you don't need Photoshop to do it. Just a
command line.

composite -compose lighten source1.jpg source2.jpg output.jpg

....and you're done.
 

carlos

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Kevin McMurtrie wrote:

> In article <420e624f@news.iis.com.br>, Carlos <gutto@iis.com.br> wrote:
>
>
>>Why DSLR´s don't take multiple exposures shots? Is there any technical
>>limitation, like, sensor overheating, excessive noise, .... ?
>
>
> Yes - sensor noise accumulates. CCD sensors also overheat.

It was I think. Thanks.

>
>
>>My question is about the fact I don't want to make multiple exposure by
>>software edition. I want know if it's impossible by a technical limit or
>> because the manufactures don't want it.
>
>
> You can use multiple flashes in a dark room or get a lens with a manual
> shutter. Noise will accumulate while the sensor is active, resulting in
> a photo that is inferior to photos merged in software.
>
>

I guess overheating is worse. I believe noise will be 99,9 % eliminated
in the next 2 years.

--
gutto@iis.com.br

Carlos A. B. Coutinho
Rio de Janeiro, RJ
Brasil
 
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In article <420e91dc@news.iis.com.br>, Carlos <gutto@iis.com.br> wrote:

> Kevin McMurtrie wrote:
>
> > In article <420e624f@news.iis.com.br>, Carlos <gutto@iis.com.br> wrote:
> >
> >
> >>Why DSLR´s don't take multiple exposures shots? Is there any technical
> >>limitation, like, sensor overheating, excessive noise, .... ?
> >
> >
> > Yes - sensor noise accumulates. CCD sensors also overheat.
>
> It was I think. Thanks.
>
> >
> >
> >>My question is about the fact I don't want to make multiple exposure by
> >>software edition. I want know if it's impossible by a technical limit or
> >> because the manufactures don't want it.
> >
> >
> > You can use multiple flashes in a dark room or get a lens with a manual
> > shutter. Noise will accumulate while the sensor is active, resulting in
> > a photo that is inferior to photos merged in software.
> >
> >
>
> I guess overheating is worse. I believe noise will be 99,9 % eliminated
> in the next 2 years.

CMOS sensors don't overheat but the tiny electrical charges representing
the image still drift and degrade over time. The rate depends on the
camera and the temperature. Some pixels will drift much faster than
others. About 96% of the pixels in a Canon DSLR can hold their charge
for over an hour but 4% noise isn't pretty.
 

MarkH

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Carlos <gutto@iis.com.br> wrote in news:420e624f@news.iis.com.br:

> Why DSLR´s don't take multiple exposures shots? Is there any technical
> limitation, like, sensor overheating, excessive noise, .... ?
>
> My question is about the fact I don't want to make multiple exposure by
> software edition. I want know if it's impossible by a technical limit or
> because the manufactures don't want it.

My guess is that it is technically possible, but the manufacturers don't
think it is worthwhile putting in a worthless feature that will not help
them sell any more cameras. If it was a useful feature with a lot of
demand for it then it would probably be available on several cameras.

If there was a camera that had every feature that was technically possible
to have could you imagine how incredibly stupid and expensive that camera
would be?



--
Mark Heyes (New Zealand)
See my pics at www.gigatech.co.nz (last updated 20-Jan-05)
"There are 10 types of people, those that
understand binary and those that don't"
 

carlos

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MarkH wrote:

> Carlos <gutto@iis.com.br> wrote in news:420e624f@news.iis.com.br:
>
>
>>Why DSLR´s don't take multiple exposures shots? Is there any technical
>>limitation, like, sensor overheating, excessive noise, .... ?
>>
>>My question is about the fact I don't want to make multiple exposure by
>>software edition. I want know if it's impossible by a technical limit or
>> because the manufactures don't want it.
>
>
> My guess is that it is technically possible, but the manufacturers don't
> think it is worthwhile putting in a worthless feature that will not help
> them sell any more cameras. If it was a useful feature with a lot of
> demand for it then it would probably be available on several cameras.
>
> If there was a camera that had every feature that was technically possible
> to have could you imagine how incredibly stupid and expensive that camera
> would be?
>
>
>

I think that in the near future it will be available. Double exposure
(or multiple) is a single and common feature in SLR's and it will be
present in DSLR's one day.

--
gutto@iis.com.br

Carlos A. B. Coutinho
Rio de Janeiro, RJ
Brasil
 
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In article <420e8b5d@news.iis.com.br>,
Carlos <gutto@iis.com.br> writes:
> Because it take time to do it. Only this.
> It's trivial in Corel PhotoPaint too, but I don't want to spend time to
> do it.
> In film cameras I didn't to do it. I only took a double exposure shot
> and nothing more.

I suppose that it should be simple to write a quick script using
Image Magick which would combine two images.

--
http://www.petezilla.co.uk
 
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Carlos <gutto@iis.com.br> wrote:

>Why DSLR´s don't take multiple exposures shots? Is there any technical
>limitation, like, sensor overheating, excessive noise, .... ?
>
>My question is about the fact I don't want to make multiple exposure by
>software edition. I want know if it's impossible by a technical limit or
> because the manufactures don't want it.

The new Nikon D2x will be able to combine two shots into one in camera.
Why you would want to do it I don't know - much simpler to do it on the
computer.

Peter
 
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Carlos wrote:

> I think that in the near future it will be available. Double exposure
> (or multiple) is a single and common feature in SLR's and it will be
> present in DSLR's one day.

Already available in Fuji S3 Pro.

Regards from Athens,
N.F.
 

carlos

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Errata:
Carlos re-wrote:

"I thought that in the near future it would be available. Double exposure
(or multiple) is a single and common feature in SLR's and it is now be
present in DSLR's today. :)

Thanks a lot, Nick.
Regards from Rio (one day, I will visit Greece)"

Nick Fotis wrote:

> Carlos wrote:
>
>
>>I think that in the near future it will be available. Double exposure
>>(or multiple) is a single and common feature in SLR's and it will be
>>present in DSLR's one day.
>
>
> Already available in Fuji S3 Pro.
>
> Regards from Athens,
> N.F.

--
gutto@iis.com.br

Carlos A. B. Coutinho
Rio de Janeiro, RJ
Brasil
 
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In article <420e624f@news.iis.com.br>, Carlos <gutto@iis.com.br> wrote:

> Why DSLR´s don't take multiple exposures shots? Is there any technical
> limitation, like, sensor overheating, excessive noise, .... ?
>
> My question is about the fact I don't want to make multiple exposure by
> software edition. I want know if it's impossible by a technical limit or
> because the manufactures don't want it.
>
Technically it may be possible but why have the feature? After all
slipping as many photos as you want into photoshop's layers means you
have total control over the outcome.
There are many features offered in DSLRs that many people don't use,
these increase the value of the camera and probably the cost too.
 
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Stewy wrote:
> In article <420e624f@news.iis.com.br>, Carlos <gutto@iis.com.br> wrote:
>
>
>>Why DSLR´s don't take multiple exposures shots? Is there any technical
>>limitation, like, sensor overheating, excessive noise, .... ?
>>
>>My question is about the fact I don't want to make multiple exposure by
>>software edition. I want know if it's impossible by a technical limit or
>> because the manufactures don't want it.
>>
>
> Technically it may be possible but why have the feature? After all
> slipping as many photos as you want into photoshop's layers means you
> have total control over the outcome.
> There are many features offered in DSLRs that many people don't use,
> these increase the value of the camera and probably the cost too.

I did something like a multiple exposure with my Canon 20D. Two were
shot with a flashlight, one with a hand held strobe (flash).

http://www.flickr.com/photos/chipgallo/sets/65138/

It's fun to do film-like techniques but if you use a computer to
composite, ultimately unnecessary.

Chip Gallo
 
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Fuji S2 Pro ALSO hsa the multiple exposure... I've tried it and it works fine
but I can't figure out why I'd do this as a normal process... Its not only
quite easy to do it in Photoshop but its a LOT more controllable... Back in the
dark ages when we had no choice with film cameras it may have made sense, but
these days its a lot easier to do in the computer.
 
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