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Thread started 09 Apr 2009 (Thursday) 18:11
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What is the best "standard ISO" for the 5D MkII?

 
clupica
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Apr 09, 2009 18:11 |  #1

Well, you know how it is. there may be a discussion of this around here soemwhere but I can't find it.

What is the best all-around default ISO for the Canon 5D Mark II. When going throught the manual I see that some of the Canon defaults are set to ISO 400. I mean, this seems a bit high to me. Should I use ISO 400 as the default or should use ISO 100 or 200 instead. I shoot a lot of outdoor / nature / full daylight and don't usually have a need to more than 200. If I do, I can usually use a longer shutter speed and a tripod (ie: macros).

Any recommendations / thoughts on this ?

Charlie




  
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jr_senator
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Apr 09, 2009 18:20 |  #2

Of course this is different with different photographers, I can't speak for others. I do have my wife's camera set at 200 ISO, but then I know her habits.



  
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Dpsteak
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Apr 09, 2009 18:25 as a reply to  @ jr_senator's post |  #3

I like to shoot as low as I can, while maintaining the shutter speed I want.


Gear:50D; 17-40L; 400 5.6L flickr (external link)

  
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Dpsteak
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Apr 09, 2009 18:25 as a reply to  @ Dpsteak's post |  #4

But I don't have a 5D MkII, I was just speaking on general terms.


Gear:50D; 17-40L; 400 5.6L flickr (external link)

  
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tofuboy
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Apr 09, 2009 18:27 as a reply to  @ jr_senator's post |  #5

regardless a 300D or 5D mk II, I've always gone with using the lowest ISO possible that still allows me to get the shot.


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Panopeeper
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Apr 09, 2009 18:34 |  #6

If you can afford the exposure, go for ISO 100:

- the DR is the highest,

- the noise is the lowest (not because of ISO 100 but because of the associated exposure).

ISO 50 is simply a 1-stop overexposed ISO 100.

See the other head about related issues:

EOS 5D Mark II Noise Reduction in RAW


Gabor

  
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jr_senator
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Apr 09, 2009 21:17 |  #7

Panopeeper wrote in post #7700457 (external link)
ISO 50 is simply a 1-stop overexposed ISO 100.

Huh? Under exposed, over exposed, what does that have to do with sensitivity of the sensor?



  
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overclock
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Apr 09, 2009 21:27 |  #8

jr_senator wrote in post #7701330 (external link)
Huh? Under exposed, over exposed, what does that have to do with sensitivity of the sensor?

ISO 50 is software extrapolated within the camera much like ISO 25600. The sensor isn't really ISO 50 sensitive.




  
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Panopeeper
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Apr 09, 2009 21:40 |  #9

jr_senator wrote in post #7701330 (external link)
Huh? Under exposed, over exposed, what does that have to do with sensitivity of the sensor?

The sensor does not have any ISO gain ("sensitivity") for ISO 50. When you select ISO 50, the sensor is doing ISO 100; thus, if you meter for ISO 50, then in fact you are using ISO 100 with +1 EV bias.

overclock wrote in post #7701388 (external link)
ISO 50 is software extrapolated within the camera much like ISO 25600

There is nothing extrapolated. ISO 50 is plain and simply ISO 100. That's it. This is in contrast to the 1/3 stop ISOs and ISO 6400, 12800 and 25600, which cause raw data adjustment before writing the file.


Gabor

  
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jr_senator
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Apr 09, 2009 22:39 |  #10

overclock wrote in post #7701388 (external link)
The sensor isn't really ISO 50 sensitive.

The camera asks for twice the amount of light at ISO 50 than at 100 ISO

Panopeeper wrote in post #7701458 (external link)
This is in contrast to the 1/3 stop ISOs...

This depends on what camera one is refering to, no?



  
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Panopeeper
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Apr 09, 2009 22:42 |  #11

jr_senator wrote in post #7701781 (external link)
The camera asks for twice the amount of light at ISO 50 than at 100 ISO

Exactly that is causing the +1 EV exposure bias.

This depends on what camera one is refering to, no?

Isn't the 5D2 the actual subject?


Gabor

  
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Daniel ­ Browning
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Apr 10, 2009 00:04 |  #12

clupica wrote in post #7700337 (external link)
What is the best all-around default ISO for the Canon 5D Mark II?

100.


Daniel

  
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coldcase
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Apr 10, 2009 01:32 |  #13

tofuboy wrote in post #7700420 (external link)
regardless a 300D or 5D mk II, I've always gone with using the lowest ISO possible that still allows me to get the shot.

Same here.


1 X 7D | 1 X 40D | Canon 10-22mm | Canon 24-105L | Canon 50mm f/1.4 | 70-200mm f/2.8L IS | Canon 100mm Macro f/2.8 | Canon 100-400 L IS | 430EX | MT-24EX |

  
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clupica
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Apr 10, 2009 01:36 |  #14

Ok, so I always shoot at the lowest ISO, almost exclusively at ISO 100. That is why I wonder why Canon has choosen a default of ISO 400. Is it possible that in order to get the higher ISO range that below 400 on the 5D II is interpolated? Does anyone have any ideas as to why Canon choose ISO 400 as a default?

Charlie




  
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kcbrown
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Apr 10, 2009 01:44 |  #15

Panopeeper wrote in post #7701458 (external link)
There is nothing extrapolated. ISO 50 is plain and simply ISO 100. That's it. This is in contrast to the 1/3 stop ISOs and ISO 6400, 12800 and 25600, which cause raw data adjustment before writing the file.

So ISO 50 doesn't cause any adjustment to the raw data that gets written?

So ISO 100 middle gray is identical to ISO 50 middle gray when you shoot both with the exact same shutter speed and aperture combination? And if you shoot ISO 50, the shot will look overexposed (because you metered for ISO 50, not ISO 100)??

Because all that is the implied consequence of what you said.


"There are some things that money can't buy, but they aren't Ls and aren't worth having" -- Shooter-boy
Canon: 2 x 7D, Sigma 17-50 f/2.8 OS, 55-250 IS, Sigma 8-16, 24-105L, Sigma 50/1.4, other assorted primes, and a 430EX.
Nikon: D750, D600, 24-85 VR, 50 f/1.8G, 85 f/1.8G, Tamron 24-70 VC, Tamron 70-300 VC.

  
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What is the best "standard ISO" for the 5D MkII?
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