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PostPosted: Mon Jul 07, 2008 10:00 am 
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Daedalus wrote:
Bob I understand what you are posting on, but I think that getting that data from the camera company will be hard as I would guess that the data we would want is closely guarded. But if we new this it would make it possible to compare cameras at there best quality shot the sensor could give.

It is actually quite surprising how much data can be gleaned - check out this article.

Bob.

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PostPosted: Mon Jul 07, 2008 10:24 am 
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Hi folks,

Terminology: As I (try to) learn more about the subject I have discovered that what I have been referring to as 'native ISO' is more commonly referred to as 'base ISO' or 'saturation-based ISO'. If that wasn't enough, as the Kodak PDF document Kodak Image Sensors – ISO Measurement describes, there is also another measurement of ISO called 'noise-based ISO'. :? :roll:

Bob.

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PostPosted: Mon Jul 07, 2008 11:33 am 
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Bob Andersson wrote:
Daedalus wrote:
Bob I understand what you are posting on, but I think that getting that data from the camera company will be hard as I would guess that the data we would want is closely guarded. But if we new this it would make it possible to compare cameras at there best quality shot the sensor could give.

It is actually quite surprising how much data can be gleaned - check out this article.

Bob.


That was a good read! I am going to try this in the next two days and see how I fare.
It was well explained so it should be easy to do.
Thanks for the heads up on this.


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PostPosted: Tue Dec 30, 2008 6:40 pm 
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I found this Forum post that explains the 40D's least noise or native ISO's.

http://forums.canonphotogroup.com/showthread.php?p=5225

I found this part of the post the most interesting of all.

Quote:
It's also worth noting, that depending on your exposure time, the list of ISO levels ranked according to noise, going from lowest noise to highest noise is:

ISO 160
ISO 100
ISO 200
ISO 320
ISO 125
ISO 250
ISO 400
ISO 640
ISO 500
ISO 800
ISO 1000
ISO 1250
ISO 1600
ISO 3200


Matt


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PostPosted: Mon Apr 06, 2009 8:45 pm 
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well had a hard time to follow your explanation, will read it again soon and see if I understand more.
However I have at least learned not to use lower ISO settings than the standard of 200 for best results, even if I don't usually do that its good to know when using long exposures!

Thanks a lot for the time you took to explain!

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PostPosted: Mon Apr 06, 2009 8:58 pm 
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*Nerd Alert*

Did you keep in mind that the DBm scale is logarithmic when you created the table?

this effecively means the ISO 50 setting has twice as much noise as ISO 100 ;)

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PostPosted: Mon Apr 06, 2009 10:45 pm 
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So whats better.

Using a ND filter and loosing sharpness..

or

Using ISO 50 and using NR and loosing sharpness..

haha

Get me ISO 5

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PostPosted: Mon Apr 06, 2009 11:48 pm 
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DD_nVidia wrote:
So whats better.

Using a ND filter and loosing sharpness..

or

Using ISO 50 and using NR and loosing sharpness..

haha

Get me ISO 5

Using a good ND filter and losing virtually no sharpness at all. :P

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OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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