ISO noise compared

[keheha]

I've been wondering how much difference there is in ISO noise on the 30D, 350D and 400D... Can anyone point me in the direction of some sort of comparison between these.

I think that ISO800+ on the 350D is very noisy - it might be because I'm a clueless noob!? :oops:
I know that you remove some of the noise in PP, but I really wish that I didn't have to.

Also I've been wondering how much influence shutter time has on the noise. Does longer exposures give more or less noise?

- Kern

[Woolburr]

Also I've been wondering how much influence shutter time has on the noise. Does longer exposures give more or less noise?

- Kern

Longer exposures don't necessarily mean more noise....the bigger factor is under-exposure....images that are only slightly underexposed show much greater noise than a proper exposure or even one that is slightly over-exposed.

[E-K]

It depends. Are you talking JPEGs or RAW? Sensor wise I believe there is little appreciable difference.

All things being equal a longer exposure will have more noise but the exposure would have to be pretty long for it to become noticeable (talking in the seconds or more range). So yes an ISO800 4" f/8 would be noisier than an ISO800 1/4" f/2 but I doubt it would be that noticeable.

Long exposure noise can normally be resolved by dark frame subtraction.

Random noise can be helped by ensuring that you don't need to push the exposure in post processing.

e-k

[PhotoFranz]

Have you ever looked at a web site called "Steve's Digacams"? In each camera review they do, they have a series of photos of the same studio shot at each ISO setting for the camera. You could DL the full size photos for each camera in question at each ISO setting and judge for yourself. You can find Steve's Digacams At this URL http://www.steves-digicams.com/

[peatoire]

Also worth noting that a correct white balance and exposure help matters greatly. You can achieve good results from 800iso on the 350 without pp when these two are correct.
But Noise Ninja is your friend :-)

[Broncobear]

Also worth noting that a correct white balance and exposure help matters greatly. You can achieve good results from 800iso on the 350 without pp when these two are correct.
But Noise Ninja is your friend :-)

I have taken very good shots with 800 iso on a rebel xt...30D I have taken some at 1600 and am very pleased.

I also like the incremental iso of the 30D that allows me to use 1000 that the rebel doesn't.

[keheha]

I have taken very good shots with 800 iso on a rebel xt...30D I have taken some at 1600 and am very pleased.
....

Am I hearing you say that the 30D's has less noise in the fast ISO modes?

- Kern

[spectralapplied]

Check out this page for an actual analysis of sensor performance with graphs and equations and everything. Note that the 20D (a.k.a. 30D - they have the same sensor) slightly outperforms the 350D in just about every category. Note also that as far as low noise performance is concerned, the 5D kicks everybody's butt - even the 1D.

http://www.clarkvision.com/imagedetail/digital.sensor.performance.summary/index.html

Don

[Tee Why]

check out dpreview.com

[keheha]

Check out this page for an actual analysis of sensor performance with graphs and equations and everything. Note that the 20D (a.k.a. 30D - they have the same sensor) slightly outperforms the 350D in just about every category. Note also that as far as low noise performance is concerned, the 5D kicks everybody's butt - even the 1D.

http://www.clarkvision.com/imagedetail/digital.sensor.performance.summary/index.html

Don

Thanks for the link, the site is really informative. I think I'll have to read it again a couple of times to completely grasp it! :-D

- Kern

[nicksan]

They should all be in similar range.
I would agree that the 5D is superior in this regard. I used to have a 30D and 5D definitely has better ISO performance.