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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 23 Jun 2010 (Wednesday) 21:56
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What ISO do you use most of the time?

 
James ­ Salenger
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Jun 24, 2010 06:56 |  #46

Canon AE-1 Program
iso 400 , F8 OR 5.6


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Alexei ­ TND
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Jun 24, 2010 07:07 |  #47

windpig wrote in post #10417942 (external link)
You are aware that those are not native ISO's? Non-native ISO's are pushed or pulled by in camera processing, not by sensor gain changes.

actually according to some test done online and by myself, the iso steps of 160. 320. 640, etc are the cleanest noise-wise, this is true for both my 7d and 5d classic


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superboy77
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Jun 24, 2010 08:58 |  #48

ISO 50


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Tim ­ Kostka
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Jun 24, 2010 18:36 |  #49

Alexei TND wrote in post #10418024 (external link)
actually according to some test done online and by myself, the iso steps of 160. 320. 640, etc are the cleanest noise-wise, this is true for both my 7d and 5d classic

Do you have a link for that? I'm sure people here are interested.


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NASS ­ Photo
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Jun 24, 2010 18:59 as a reply to  @ Tim Kostka's post |  #50

ISO 100 on my 5DM2. Kodachrome 64 was my 'fast' ASA of choice when I was shooting with film on my F-1, with Kodachrome 25 as my other film choice.


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gkanetkar
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Jun 24, 2010 19:12 |  #51

ISO 100 on my Xt whenever I can. I go as high as 800 when shutter speed demands for it. At ISO 1600, my XT shows really grainy pictures and thats the max available for my toy.


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PhotoJourno
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Jun 24, 2010 19:13 |  #52

I use a 40D, and I have been shooting anywhere from 160 to 640.
Try to not go past 800, though sometimes I do spike up to 1600 or 3200 (H).
Those High ISOs are virtually useless to me, unless I don't mind an RGB mist all over my image.


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HKGuns
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Jun 24, 2010 19:19 |  #53

6400

IMAGE: http://hkguns.zenfolio.com/img/s8/v10/p622261558-5.jpg



  
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FlyingPhotog
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Jun 24, 2010 19:35 |  #54

Alexei TND wrote in post #10418024 (external link)
actually according to some test done online and by myself, the iso steps of 160. 320. 640, etc are the cleanest noise-wise, this is true for both my 7d and 5d classic

I've heard simliar reports under the banner of what is sometimes called "Native ISO" for a given system.


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tonylong
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Jun 24, 2010 19:37 |  #55

Alexei TND wrote in post #10418024 (external link)
actually according to some test done online and by myself, the iso steps of 160. 320. 640, etc are the cleanest noise-wise, this is true for both my 7d and 5d classic

Tim Kostka wrote in post #10421480 (external link)
Do you have a link for that? I'm sure people here are interested.

"Intermediate" ISOs are interoplated from either the lower or higher "real" ISO. So, ISO 125 is actually derived from reading the real gain of the ISO 100 amplifier, then using software to boost the signal by 1/3 stop. ISO 160 is the signal from the ISO 200 amplifier then lowered by 1/3 stop.

There are a couple considerations about this. For, say, ISO 125, you are boosting an underexposed ISO 100 shot which will also boost any noise in the underexposed shot. The opposite happens with ISO 160 -- when the signal is lowered by software noise is also lessened, which is why the output shows less noise than ISO 200 or, by some margin, ISO 100 (due to the fact that increased ISO amplifiers have more efficiency noise-wise -- a subject that has been covered if you look for the HAMSTTR thread and follow its links).

The downside of shooting at one of the 2/3 stop settings such as ISO 160 is that because you are exposing at 1/3 stop higher than you "think" you are, you could inadvertently get overexposed, losing some highlights.

If you are shooting Raw, you can get the same results by just shooting at the higher "real" ISO, keeping an eye on those highlights, and handling your own compensation. If you are shooting jpeg, it is probably best to use the intermediate ISO that matches your needs to minimize the need to adjust the jpeg in post processing.


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PhotoJourno
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Jun 24, 2010 19:39 |  #56

I think if you google "40D ISO performance chart" you should see several documents that show how the ISO is used, and how it works within the electronic frame of reference. I did not try for other models, but I am almost sure it also was done for 50D and 5D


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narlus
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Jun 24, 2010 19:49 |  #57

i mainly shoot concerts so 1600 is a good starting point, and i rarely drop down even if i've got tons of light. i'd rather stop down to get more DoF.


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IUnknown
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Jun 24, 2010 19:49 |  #58

Native iso's are described clearly on the zacuto shootout videos,
http://philipbloom.net …w-available-for-download/ (external link)

I forget which episode it was that goes over it.


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scubthebub
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Jun 24, 2010 19:50 |  #59

MCAsan wrote in post #10416358 (external link)
I have shot at any where from ISO 100 to 128,000. Yes, 128,000 to get a grainly shot...instead of no shot. Depends on the circumstances.

My default is 100, and I go up from there as needed. I've shot up to 1600 on my 20D and even then I had to cheat by underexposing by 2 stops. I shoot in RAW so it wasn't a huge deal.


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Cesium
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Jun 24, 2010 19:56 |  #60

Whatever ISO film is loaded.

/smartass reply.

I'm usually either around 100/200 outdoors or 800/1600 indoors. Rarely at ISO 400 on digital.




  
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What ISO do you use most of the time?
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