Canon's are not noisless

It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

RichA wrote:

It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

It's hard to say with only a reduced-size JPEG, but what you're seeing in
the green areas looks to me at first blush like shadow clipping in one
color channel.

On the other hand, if you consider that shot to be "noisy", I think you're
better off waiting on digital photography entirely for a few more years.
I don't find it objectionable at all.

--
Jeremy |

"RichA" wrote in message
...
It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

This one here is even noisier. http://www.pbase.com/myirwin/image/46013661

Something's is strange because this shot
http://www.pbase.com/rkircher/image/45323916 was shot at 800 and this shot
http://www.pbase.com/rkircher/image/45360178 was at 1600 and they both look
less noisy to me.

This one http://www.pbase.com/rkircher/image/45323915 was at 1600 and where
it's noisy as you'd expect it doesn't seem proportionally noisy compared to
the sample you posted. Anyway here you can see the noise is real bad in the
blue and black areas so I don't think Green has anything to do with it.

All these shots were done at night and I'd done no Noise reduction.

BTW the original shots were done with a 300D just like my shots.

--

Rob

"Robert R Kircher, Jr." wrote in message
...
"RichA" wrote in message
...
It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

This one here is even noisier. http://www.pbase.com/myirwin/image/46013661

Something's is strange because this shot
http://www.pbase.com/rkircher/image/45323916 was shot at 800 and this shot
http://www.pbase.com/rkircher/image/45360178 was at 1600 and they both
look less noisy to me.

This one http://www.pbase.com/rkircher/image/45323915 was at 1600 and
where it's noisy as you'd expect it doesn't seem proportionally noisy
compared to the sample you posted. Anyway here you can see the noise is
real bad in the blue and black areas so I don't think Green has anything
to do with it.

All these shots were done at night and I'd done no Noise reduction.

BTW the original shots were done with a 300D just like my shots.

--

Rob



My guess was that it was underexposed at the outset, and pulled out, that
seems to add to the noise levels, in my experience.

--
Skip Middleton
http://www.shadowcatcherimagery.com

"RichA" wrote in message
...
It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

No, I've found that the blue channel is the main culprit, as did DPReview.

--
Skip Middleton
http://www.shadowcatcherimagery.com

"Skip M" wrote in message
news:RUlAe.11055$HV1.3132@fed1read07...
"Robert R Kircher, Jr." wrote in message
...
"RichA" wrote in message
...
It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

This one here is even noisier.
http://www.pbase.com/myirwin/image/46013661

Something's is strange because this shot
http://www.pbase.com/rkircher/image/45323916 was shot at 800 and this
shot http://www.pbase.com/rkircher/image/45360178 was at 1600 and they
both look less noisy to me.

This one http://www.pbase.com/rkircher/image/45323915 was at 1600 and
where it's noisy as you'd expect it doesn't seem proportionally noisy
compared to the sample you posted. Anyway here you can see the noise is
real bad in the blue and black areas so I don't think Green has anything
to do with it.

All these shots were done at night and I'd done no Noise reduction.

BTW the original shots were done with a 300D just like my shots.

--

Rob



My guess was that it was underexposed at the outset, and pulled out, that
seems to add to the noise levels, in my experience.



The OPs sample image appears as if they was taken on a rainy day so you may
very well be correct. I took a look at some of the other galleries,
however, and they too have pics that are very noisy at 400ISO. I'm by no
means a pro here but it seems to me that I'm getting better results across
the ISO range then what's been posted. Makes me thing it may be a post
processing issues.

--

Rob

On Sun, 10 Jul 2005 20:53:45 -0700, "Skip M"
wrote:

"RichA" wrote in message
.. .
It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

No, I've found that the blue channel is the main culprit, as did DPReview.

Personally, since it's background, I don't find the noise that
objectionable, just noticeable.
-Rich

On Sun, 10 Jul 2005 21:46:24 -0400, "Robert R Kircher, Jr."
wrote:

"RichA" wrote in message
.. .
It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

This one here is even noisier. http://www.pbase.com/myirwin/image/46013661

Something's is strange because this shot
http://www.pbase.com/rkircher/image/45323916 was shot at 800 and this shot
http://www.pbase.com/rkircher/image/45360178 was at 1600 and they both look
less noisy to me.

This one http://www.pbase.com/rkircher/image/45323915 was at 1600 and where
it's noisy as you'd expect it doesn't seem proportionally noisy compared to
the sample you posted. Anyway here you can see the noise is real bad in the
blue and black areas so I don't think Green has anything to do with it.

All these shots were done at night and I'd done no Noise reduction.

BTW the original shots were done with a 300D just like my shots.

Your third shot seems to have more moderate contrast than the first
two as well.
-Rich

"RichA" wrote in message
...
It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

It says you're shooting with a 300D...considerably nosier then an XT
especially at higher isos.

"RichA" wrote in message
...
On Sun, 10 Jul 2005 20:53:45 -0700, "Skip M"
wrote:

"RichA" wrote in message
. ..
It looks like you need very specific conditions to avoid noise,
even with Canon DSLRs. Take a look at this shot. Look at the green
areas. This is 400ISO with a Rebel XT. The shot exposure seens right
on, yet I clearly see noticeable noise in the green. Given the small
size of the image (relative to the native image size out of the
camera) it is very noticeable.
Is the green channel the main contributor to the noise?

http://www.pbase.com/myirwin/image/46013664

No, I've found that the blue channel is the main culprit, as did DPReview.

Personally, since it's background, I don't find the noise that
objectionable, just noticeable.
-Rich

Neither did I, in fact, had my attention not been drawn to it, I wouldn't
have noticed.

--
Skip Middleton
http://www.shadowcatcherimagery.com