For all of us new to Digital
Posted 26/02/2010 - 13:45
Link
It's just a question of degree. You can't say at what stages noise is a problem because that's a matter of preference and opinion, as well as there being differences with different cameras.
Look close enough at a plain subject (like clear sky) and you will see noise even in an ISO 100 shot with the fastest shutter speed. The amount of noise gradually increases as the ISO and exposure length increases.
ISO has more effect on noise than shutter speed, once over the base ISO. Base ISO for Pentax DSLRs is usually between ISO 100 and 200, depending on the model.
Look close enough at a plain subject (like clear sky) and you will see noise even in an ISO 100 shot with the fastest shutter speed. The amount of noise gradually increases as the ISO and exposure length increases.
ISO has more effect on noise than shutter speed, once over the base ISO. Base ISO for Pentax DSLRs is usually between ISO 100 and 200, depending on the model.
~Pete
Posted 26/02/2010 - 14:05
Link
Quite correct.
1/125 is fast shutter speed though and the sensor get noisy with long shutterspeed because it get warm. So it depends on how many photos you take and for how long, I wouldn't worry too much about this with normal photography only with long exposures of seconds.
There is no real dividing line in ISO, there is something called base ISO and it's the ISO where the sensor capture the most exposure range, with most sensor it's around ISO 200 and ISO 400.
And we would see noise at all ISO speeds to be honest but when it gets too much is a personal choice.
Most user would find ISO800 the max for most camera's although some would preform better and other worse.
For the rest, here take a look at this site, it might explain everything you want to know http://www.cambridgeincolour.com/tutorials/image-noise.htm
1/125 is fast shutter speed though and the sensor get noisy with long shutterspeed because it get warm. So it depends on how many photos you take and for how long, I wouldn't worry too much about this with normal photography only with long exposures of seconds.
There is no real dividing line in ISO, there is something called base ISO and it's the ISO where the sensor capture the most exposure range, with most sensor it's around ISO 200 and ISO 400.
And we would see noise at all ISO speeds to be honest but when it gets too much is a personal choice.
Most user would find ISO800 the max for most camera's although some would preform better and other worse.
For the rest, here take a look at this site, it might explain everything you want to know http://www.cambridgeincolour.com/tutorials/image-noise.htm
Stefan
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Posted 26/02/2010 - 14:07
Link
iceblinker wrote:
ISO has more effect on noise than shutter speed, once over the base ISO. Base ISO for Pentax DSLRs is usually between ISO 100 and 200, depending on the model.
For the K10D, K200D & K-M it's between the ISO 100 & 200ISO has more effect on noise than shutter speed, once over the base ISO. Base ISO for Pentax DSLRs is usually between ISO 100 and 200, depending on the model.
K20D & K7 is a bit over the ISO200
K-X seems to have a base ISO close to the ISO400
If we must to believe the reviews.
Stefan
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Posted 26/02/2010 - 14:13
Link
Certainly not 125: you'd need much slower speeds to notice noise induced by a long exposure, maybe c. half a second, but, as Pete says, in truth noise is there at all speeds, just as every film has a grain structure and size. As for ASA I've taken pictures at 800ASA which I see as quite acceptable at lowish enlargements. I understand the latest Pentax DSLRs, particularly the Kx are particularly good in low-light situations.
Noise build gradually throughout the ASA range, the point at which it becomes objectionable depend on, inter-alia, the photographer's tolerance of it!
As I understand it, luminance noise is more acceptable and "filmic", a little like grain, than colour noise which is generally seen as nasty and digital. These can both be disguised by software, either in camera or after capture on a computer but often at the expense of detail.
I wouldn't stress about it too much if I were you: unless you're consistently pushing your camera to the limits, light-wise, it probably won't be an issue. Compared to even a good compact camera you'll be amazed at the difference. I love my Ricoh R7 and in good light the results are excellent but shoot below ASA400 and well, you can guess.
Just enjoy the wonderful pictures of the beautiful wild area in which you live recorded by your faithful Pentax!
Best wishes,
Andrew
Noise build gradually throughout the ASA range, the point at which it becomes objectionable depend on, inter-alia, the photographer's tolerance of it!
As I understand it, luminance noise is more acceptable and "filmic", a little like grain, than colour noise which is generally seen as nasty and digital. These can both be disguised by software, either in camera or after capture on a computer but often at the expense of detail.
I wouldn't stress about it too much if I were you: unless you're consistently pushing your camera to the limits, light-wise, it probably won't be an issue. Compared to even a good compact camera you'll be amazed at the difference. I love my Ricoh R7 and in good light the results are excellent but shoot below ASA400 and well, you can guess.
Just enjoy the wonderful pictures of the beautiful wild area in which you live recorded by your faithful Pentax!
Best wishes,
Andrew
Best wishes,
Andrew
"These places mean something and it's the job of a photographer to figure-out what the hell it is."
Robert Adams
"The camera doesn't make a bit of difference. All of them can record what you are seeing. But, you have to SEE."
Ernst Hass
My website: http://www.ephotozine.com/user/bwlchmawr-199050
http://s927.photobucket.com/home/ADC3440/index
https://www.flickr.com/photos/78898196@N05
Andrew
"These places mean something and it's the job of a photographer to figure-out what the hell it is."
Robert Adams
"The camera doesn't make a bit of difference. All of them can record what you are seeing. But, you have to SEE."
Ernst Hass
My website: http://www.ephotozine.com/user/bwlchmawr-199050
http://s927.photobucket.com/home/ADC3440/index
https://www.flickr.com/photos/78898196@N05
Posted 26/02/2010 - 14:15
Link
Re luminance and colour noise, this is how I think of it....
Luminance noise is the pattern and brightness of the noise.
Colour (aka chroma) noise is the colour of the noise.
Reducing colour noise improves the image appearance without loosing the detail and sharpness that happens with general noise reduction. It makes noise look more like film grain than the usual multi-colour speckly digital noise.
Luminance noise is the pattern and brightness of the noise.
Colour (aka chroma) noise is the colour of the noise.
Reducing colour noise improves the image appearance without loosing the detail and sharpness that happens with general noise reduction. It makes noise look more like film grain than the usual multi-colour speckly digital noise.
~Pete
Posted 26/02/2010 - 22:50
Link
Thanks to all. The link was very informative.
Steven
Steven
Add Comment
To leave a comment - Log in to Pentax User or create a new account.
63 posts
16 years
Buffalo,
Wyoming USA
What is the dividing line in ISO. For years I have considered ISO 200 normal conditions. Same question here. At what point would you expect to see noise from ISO speed?
Next. luminance and color noise. I have searched this site and others looking for examples of these and have not been able to find any. The ones that were on this site are no longer available. Would someone post some pictures that have these problems so that I may see what it looks like?
Thanks,
Steven