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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 15 Jan 2012 (Sunday) 16:58
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Has anyone shot with a strobe @ ISO 50 on their 5D MK 2?

 
dannequin
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Jan 15, 2012 16:58 |  #1

I was curious to see what this might look like -- granted I may not get a higher shutter but be able to adjust the power of my strobe towards full power almost (regarding the environment that I shoot in)

How clean are the files @ 50 ISO compared to 100 ISO?


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sandpiper
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Jan 15, 2012 17:31 |  #2

I haven't shot at ISO 50 with a strobe, but I assume that it will be much the same as using it normally. It is unlikely that you will notice a difference in noise, both 50 and 100 should be very clean. The difference is going to be the fact that you lose a stop of dynamic range using ISO 50, as it is a pulled ISO, rather than a real one.




  
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I ­ weston ­ I
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Jan 15, 2012 17:40 |  #3

ISO 50 will be similar in noise to ISO 100. It is basically ETTR by 1 stop then pulled back.

Are you wanting wide aperture with flash in daylight? Watch for blown highlights with ISO 50


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dannequin
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Jan 15, 2012 17:41 |  #4

I weston I wrote in post #13709606 (external link)
ISO 50 will be similar in noise to ISO 100. It is basically ETTR by 1 stop then pulled back.

Are you wanting wide aperture with flash in daylight? Watch for blown highlights with ISO 50

Dark night club, and wanting to almost shoot near full power... but I assume this isn't going to happen


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ender78
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Jan 15, 2012 17:48 |  #5

ISO50 would theoretically halve the power of your flash from 100. Are you not going the wrong way? Why can't you halve the flash power.




  
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Jan 23, 2012 07:37 as a reply to  @ ender78's post |  #6

ISO 50 is there to allow you to cut down on the light coming into your lens like an ND grad. An example would be if you wanted to take a longer exposure in bright conditions ie. cloud movement. There is no noise advantage as the baseline is still ISO 100 . Using this setting for a club would be a little backwards. You would lose a lot of ambient and burn up your flash.

It would actually be better to go ISO 800-1600 in a club so you can freeze movement with your flash but still grab some of the ambient light in your background.

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Jan 23, 2012 12:43 |  #7

I shoot at iso50 in the studio quite often, its mostly because my lights are already at min power and i want a wider aperture.

Sometimes i'll end up with iso50, and an ND grad of 2x before i can get to my f2 or f2.8.

Its a small studio.

Remember, if you shoot in a nightclub at iso50 you will have NO ambient registering unless youre doing some crazy slow shutter exposure. I generally like to have the event's ambient register even if only a little.


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say_cheese
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Jan 23, 2012 15:06 |  #8

Csae wrote in post #13753898 (external link)
I shoot at iso50 in the studio quite often, its mostly because my lights are already at min power and i want a wider aperture.

Sometimes i'll end up with iso50, and an ND grad of 2x before i can get to my f2 or f2.8.

Its a small studio.

Remember, if you shoot in a nightclub at iso50 you will have NO ambient registering unless youre doing some crazy slow shutter exposure. I generally like to have the event's ambient register even if only a little.

I do exactly the same thing as my studio is also quite small and sometimes my strobes too bright. I have not done any serious comparisons between 50 and 100 ISO pictures but to my eye they appear noise free.


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Gometang
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Jan 23, 2012 19:14 |  #9

50ISO has less noise than 100ISO on the 5dm2 from my own comparisons.




  
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rejay14
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Jan 23, 2012 19:34 |  #10

https://photography-on-the.net/forum/showthre​ad.php?t=694566


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TheBrick3
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Jan 23, 2012 19:46 as a reply to  @ rejay14's post |  #11

Yeah, I usually shoot 1000-2000 ISO in a nightclub.


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Gometang
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Jan 23, 2012 19:52 |  #12

http://landscapeandnat​urephotography.com …ormance-canon-5d-mark-ii/ (external link)




  
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Jan 23, 2012 21:12 |  #13

All the time.. as others mentioned, sometimes it's easier to cut the ISO in half than the flash power..


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Curtis ­ N
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Jan 23, 2012 21:33 |  #14

dannequin wrote in post #13709612 (external link)
Dark night club, and wanting to almost shoot near full power... but I assume this isn't going to happen

BrandonSi wrote in post #13757181 (external link)
All the time.. as others mentioned, sometimes it's easier to cut the ISO in half than the flash power..

I can't make any sense in this. I can't think of any reason not to cut your flash power when conditions allow.

When shooting at ISO 50 you're reducing your camera's dynamic range by a stop. Maybe that's not big deal. You'll have to do your own testing and compare shots.


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BrandonSi
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Jan 23, 2012 21:44 |  #15

Curtis N wrote in post #13757320 (external link)
I can't make any sense in this. I can't think of any reason not to cut your flash power when conditions allow.

When shooting at ISO 50 you're reducing your camera's dynamic range by a stop. Maybe that's not big deal. You'll have to do your own testing and compare shots.

Ideally that's what you want to do.. but say you have a light boomed up 15ft and it's not hooked up to an intelligent trigger, and after you meter it's higher than you though, requiring you to stop-down more than you want for the DOF.. I'm not taking it down and changing the power, I'm dropping to ISO 50 and going from there.

I can also get into a rhythm with a model in the studio and when things are really flowing, the last thing I want to do is kill everything and say "hang on, I gotta stop the shoot and adjust the light over here for a minute, then re-meter, then change it one more time.." etc..

A lot of times 1 stop of dynamic range isn't a big deal. Simple fashion shoot on white seamless, muted color clothing, not too much texture.... I could care less about that stop in dynamic range because the image is going to look the same as far as dynamic range is concerned at 50 vs100.


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Has anyone shot with a strobe @ ISO 50 on their 5D MK 2?
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