Canon 40D RAW problems

[ndee]

Example

Lately, I've been noticing some problems when I shoot RAW pictures with my Canon 40D. When you check out the area near the lights on the building, it looks very "weird".

Also, I took some pictures of the full-moon and the pitch-black sky was totally full of noise. Those pictures were taken at a ISO 100 setting so how come there is so much noise? When I took the same shot as JPG, there was no noise at all. There were no Custom Functions activated.

Any help is greatly appreciated.

Thanks,
Andy

 

[soydios]

1) that shot was at ISO400. that explains the small amount of noise that's there.

the poor gradations occur because you clipped the blue channel. in the future, check the histograms for each color.

 

[rivan]

Originally posted by: soydios
1) that shot was at ISO400. that explains the small amount of noise that's there.

the poor gradations occur because you clipped the blue channel. in the future, check the histograms for each color.

@ soydios - How would you adjust for that in the field? To shoot that correctly would you need a filter?

@OP - Were those blacklights or something?

 

[GoSharks]

Originally posted by: rivan
@ soydios - How would you adjust for that in the field? To shoot that correctly would you need a filter?

Just adjust the exposure like you normally would.

 

[xchangx]

I'd shoot it at iso 100 and possibly between 10-15 secs.

Check your histogram to make sure you didn't blow anything out.

trial and error

 

[xchangx]

Originally posted by: ndee
Example

Lately, I've been noticing some problems when I shoot RAW pictures with my Canon 40D. When you check out the area near the lights on the building, it looks very "weird".

Also, I took some pictures of the full-moon and the pitch-black sky was totally full of noise. Those pictures were taken at a ISO 100 setting so how come there is so much noise? When I took the same shot as JPG, there was no noise at all. There were no Custom Functions activated.

Any help is greatly appreciated.

Thanks,
Andy

sorry, just read the second part. looks like there may have been some noise reduction on the JPG setting which is why it came out better.

 

[rivan]

Originally posted by: GoSharks

Originally posted by: rivan
@ soydios - How would you adjust for that in the field? To shoot that correctly would you need a filter?

Just adjust the exposure like you normally would.

The rest of the shot is properly exposed (check the cars). Is there a way to get the whole shebang in a single shot?

 

[aatf510]

Originally posted by: ndee
Example

Lately, I've been noticing some problems when I shoot RAW pictures with my Canon 40D. When you check out the area near the lights on the building, it looks very "weird".

Also, I took some pictures of the full-moon and the pitch-black sky was totally full of noise. Those pictures were taken at a ISO 100 setting so how come there is so much noise? When I took the same shot as JPG, there was no noise at all. There were no Custom Functions activated.

Any help is greatly appreciated.

Thanks,
Andy

In a DSLR, High ISO value isn't the only factor that introduce noise in an image. Long Exposure (>1 sec) is also a major factor that causes noise to build up.
I am not familiar with Canon DSLRs, but on Nikon DSLRs there are both an option of "High ISO Noise Reduction" & another option "Long Exposure Noise Reduction."
You might want to enable those Noise Reduction functions in your camera, however, you will be hit by some details lost when the camera reduces noise on the images.

 

[xchangx]

I'd try to stop the camera down to f8, iso 100, 10-15secs with noise reduction.

 

[ElFenix]

Originally posted by: toattett
You might want to enable those Noise Reduction functions in your camera, however, you will be hit by some details lost when the camera reduces noise on the images.

this is a canon, not a nikon. its noise reduction system doesn't erase stars unless you trick it into thinking the battery is about to die.

 

[Adul]

turn on the noise reduction for long exposures, it will take longer to process the image, but it comes out with a lot less noise. the other option is to run it through an noisefilter like noise ninja