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Author Topic: Question regarding ISO 50 on 5D III  (Read 10626 times)

eyeland

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Re: Question regarding ISO 50 on 5D III
« Reply #15 on: April 02, 2013, 09:14:17 AM »
Today while doing a test of low iso noise in shots with blue skies and clouds, I noticed that when PP, the shots at 50 ISO seem t behave quite different than any other low ISO - namely coming out more saturated with more "pop"
What might explain this?
I will do a little further testing today and post a few examples.
Edit: the strength of the effect I (thought) I saw was probably due to user error as I can't seem to replicate it...
Still, after reading endless claims about ISO, I am still not sure about the pros and cons of native vs non-native...



« Last Edit: April 02, 2013, 09:36:16 AM by eyeland »
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Re: Question regarding ISO 50 on 5D III
« Reply #15 on: April 02, 2013, 09:14:17 AM »

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Re: Question regarding ISO 50 on 5D III
« Reply #16 on: April 02, 2013, 10:17:14 AM »
Thanks for the reminder...I basically forgot the 5DIII had ISO 50 because the ISO 50 on my previous camera (5D) looked awful and I never used it.  Got to go take some test shots now.


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Re: Question regarding ISO 50 on 5D III
« Reply #17 on: April 02, 2013, 11:28:22 AM »
Well as I understand it ISO 50 (L) is ISO 100 over exposed by 1 stop and then processed back down to correct exposure.

So, if you're  in the 'ETTR' camp it's helping you out.

Actually, as long as I'm not loosing highlights I like it.

(Which means I am probably a closet ETTR practitioner )
« Last Edit: April 02, 2013, 11:41:30 AM by Sporgon »

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Re: Question regarding ISO 50 on 5D III
« Reply #18 on: April 02, 2013, 11:53:40 AM »
Pulls are always better than a push as far as noise goes. Just so long as you don't over expose in the first place and need to retrieve high lights 50 should be fine. Although if you are pushing shadows in post you may not have the detail you need.

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Re: Question regarding ISO 50 on 5D III
« Reply #19 on: April 02, 2013, 03:59:32 PM »
Just took some ISO 50, F/22 photographs last week. A very useful mode, that allows more than 1 sec of exposure at 5.30 p.m. in spring.


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eyeland

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Re: Question regarding ISO 50 on 5D III
« Reply #20 on: April 03, 2013, 04:58:00 AM »

Well as I understand it ISO 50 (L) is ISO 100 over exposed by 1 stop and then processed back down to correct exposure.

So, if you're  in the 'ETTR' camp it's helping you out.


ahh ofc, that would explain why I only saw a benefit on a specific scene. This would also mean that native vs non-native iso is relevant to consider if practicing ETTR?
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Re: Question regarding ISO 50 on 5D III
« Reply #21 on: April 03, 2013, 06:33:50 AM »

Well as I understand it ISO 50 (L) is ISO 100 over exposed by 1 stop and then processed back down to correct exposure.

So, if you're  in the 'ETTR' camp it's helping you out.


ahh ofc, that would explain why I only saw a benefit on a specific scene. This would also mean that native vs non-native iso is relevant to consider if practicing ETTR?


Good point.

The answer is yes, because if you exposed to the right by say two thirds whilst in (L) you would actually be over exposing by one and two thirds EV.

Some have suggested that if you're shooting in RAW then ISO 50 (L) is pointless because you can just shoot ISO 100 and over expose by one full EV (stop), and then post process down. I disagree as if you do this you are lumbered with all your files showing one EV over exposure. IMO much better to shoot in L, gain from the benefit of ETTR, and allow the camera program to bring files back to 'correct' exposure, but you have within there the better info for darker areas.

The caveat of course is that just as when practicing ETTR, when shooting in (L) the photographer must judge the strength of highlights because you will be further over exposing them.

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Re: Question regarding ISO 50 on 5D III
« Reply #21 on: April 03, 2013, 06:33:50 AM »

eyeland

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Re: Question regarding ISO 50 on 5D III
« Reply #22 on: April 03, 2013, 07:05:49 AM »
Fully understood and agreed.
By "non native ISO" I was however also referring to ISO values such as 160 and 320, as these are pulled (similar to 50?) in contrast to eg. 125 which is claimed to be pushed.
I am trying to figure out if the inclusion of pulled ISO values make ETTR less useful

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Re: Question regarding ISO 50 on 5D III
« Reply #23 on: April 03, 2013, 07:55:00 AM »
Fully understood and agreed.
By "non native ISO" I was however also referring to ISO values such as 160 and 320, as these are pulled (similar to 50?) in contrast to eg. 125 which is claimed to be pushed.
I am trying to figure out if the inclusion of pulled ISO values make ETTR less useful


Sorry, I read your response as just relating to 'L' and 'H'; perhaps that's because I know about those !

I am not so sure of my facts with intermediate ISOs, but from what I do know, again you raise a very valid point.

If ISO 160 is pulled from 200, ie it is just ISO 200 over exposed by one third of a stop and reduced back to 'correct' exposure in camera, then the same principle will apply. Conversely if 125 is pushed one third from 100 the principle applies in reverse: you'd be already under exposing by one third so ETTR would have to be increased to compensate.

By the same principle ISO 160 would then have one third less EV latitude ( the dreaded DR ) than 200, but the test graphs don't show this.

But I am not sure of my facts on these 'non native' ISOs. I've read that people claim there is less noise at ISO 160 than 100, but I have not found this to be the case. However I have found that ISO 50 (L) can give smoother data than 100.

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Re: Question regarding ISO 50 on 5D III
« Reply #24 on: April 03, 2013, 08:43:14 AM »
But I am not sure of my facts on these 'non native' ISOs. I've read that people claim there is less noise at ISO 160 than 100, but I have not found this to be the case. However I have found that ISO 50 (L) can give smoother data than 100.

I've not noticed a marked difference between 100 and 160, but this chart is worth a look.

http://home.comcast.net/~NikonD70/Charts/RN_ADU.htm#EOS%205D%20Mark%20II_14
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Re: Question regarding ISO 50 on 5D III
« Reply #25 on: April 03, 2013, 08:54:05 AM »
I've not noticed a marked difference between 100 and 160, but this chart is worth a look.

http://home.comcast.net/~NikonD70/Charts/RN_ADU.htm#EOS%205D%20Mark%20II_14

Indeed.   All the recent/current Canon bodies except the 1D X have that sawtooth pattern.
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« Last Edit: April 03, 2013, 09:49:00 AM by eyeland »
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Re: Question regarding ISO 50 on 5D III
« Reply #27 on: April 03, 2013, 10:36:37 AM »
I've not noticed a marked difference between 100 and 160, but this chart is worth a look.

http://home.comcast.net/~NikonD70/Charts/RN_ADU.htm#EOS%205D%20Mark%20II_14

Indeed.   All the recent/current Canon bodies except the 1D X have that sawtooth pattern.

Yep, it's interesting how relatively flat the 1Dx is before about 1600ISO.

The idea that intermediate isos are pushed or pulled makes a little more sense to me than something at the amp level ("The shape of the curve can tell you something about the amplifier circuitry of the camera"), but I wonder why they'd take a completely different approach with the 1Dx.
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Re: Question regarding ISO 50 on 5D III
« Reply #27 on: April 03, 2013, 10:36:37 AM »

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Re: Question regarding ISO 50 on 5D III
« Reply #28 on: April 03, 2013, 10:42:17 AM »
It is ETTR. Unless you blow the highlights (and with a "normal" DR scene, there is plenty of highlight room), you get about 1 step lower noise.  This means smoother tonal gradations, better response to more extreme pp, WB tweaks, vignetting corrections, etc. In critical situations, I would take a shot at ISO 100 as well, just in case.

eyeland

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Re: Question regarding ISO 50 on 5D III
« Reply #29 on: April 03, 2013, 11:08:33 AM »
also interesting how the 1DX noise drops at ISO 200? can't wait to get my hands on one :)
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Re: Question regarding ISO 50 on 5D III
« Reply #29 on: April 03, 2013, 11:08:33 AM »