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Thread started 22 Dec 2009 (Tuesday) 09:08
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How does auto ISO work on the 5D Mk II

 
laydros
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Dec 22, 2009 09:08 |  #1

I love auto ISO on my 40D. Being able to set the aperture and letting the camera figure out what shutter and ISO is great. Canon's system is really smart and knows what lens I'm using, and automatically adjusts the "minimum" shutter speed. Additionally I'm not much of a pixel peeper, and ISO 800 on the 40D is fine with me. When I'm shooting with strobes or in daylight I'll drop down to ISO 200 (100 isn't an option with HTP turned on), but the 400-800 range is good in cases when light isn't great.

So I'm getting that FF hankering so many people seem to get. I like low light, I like shallow depth of field, and I like wide angles. I think the real slam dunk for FF is that the L build 17-40 is cheaper than the (optically great) non-L build 10-22.

So I'm looking at 5D Mk II reviews, and saw something about the auto ISO, it looks like it goes from 100 (nice, I like that better than 400) all the way up to 6400.(!) Is this right? I know that high ISOs are much cleaner in the 5D Mk II than they are on the 40D, but I thought we were talking 1.5 stops, not 3 stops.

So here are the questions:
1) Do I understand correctly that auto ISO is 100-6400? Is there any way to adjust that range (I don't think there is on the 40D)?
2) Is ISO 6400 on the 5D Mk II as clean as ISO 800 on the 40D? If I'm perfectly happy with my low-light shots at ISO 800 on the 40D should I not be afraid of ISO 6400 on the 5D Mk II?
3) Do many (or most) other people shoot in auto ISO? Assuming Canon changed the auto ISO so that it operates outside of the "safe zone" that my 40D does, does that mean that other people don't use auto ISO as much as I do?


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swjim
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Dec 22, 2009 10:30 |  #2

I've never used auto ISO myself, but this is from the manual and might help:


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jacobsen1
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Dec 22, 2009 10:42 as a reply to  @ swjim's post |  #3

if you liked the 40D's auto ISO you'll be fine with the 5Dii's. That said, the 5Dii's auto ISO is TERRIBLE if you like wide lenses. The 1/FL assumption is terrible once you get to a 50mm or wider lens and want to shoot people. 1/60th of a second? Really canon? Yes, that might work for some people some of the time, but you give us no options? Idiots. Switch it to Tv and you can only shoot wide open? No one ever stops down? And what about manual mode? Why is it crippled to 400ISO? It'd work really well if I could dial in an aperture and shutter speed and you made it work regardless of the light, but you don't. And then you make it work PERFECTLY in video mode (only after we cried for 6~9 months) but not still mode? Really?

Yeah, that's a bit of a rant. Yeah, a lot of "pros" will say auto ISO is as bad as using green box mode. Some will also say canon's current theories for auto ISO work fine. Those same shooters must use really controlled light, not use wide primes and care about stopping action, and love to shoot wide open all the time.

Not to beat a dead horse, but Nikon's Auto ISO KILLS canon's all day, ever day (but it's still not perfect, it's slowest shutter speed is 1/2 or something like that, why can't landscapers get it to go all the way to 30 seconds guys?).

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My D700 has been shot using it set to Av and floating between 200 and 6400 giving me a shutter speed of no less than 1/125th since the day I got it. :D


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zshaft
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Dec 22, 2009 10:49 as a reply to  @ swjim's post |  #4

i will continue to answer your question number 2:
ISO 6400 5d2 equals with ISO 3200 of 40d (in my opinion).
ISO 1600 5d2 equals with ISO 800 of 40d.:D


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Ziffle
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Dec 22, 2009 10:56 |  #5

jacobsen1 wrote in post #9244923 (external link)
if you liked the 40D's auto ISO you'll be fine with the 5Dii's. That said, the 5Dii's auto ISO is TERRIBLE if you like wide lenses. The 1/FL assumption is terrible once you get to a 50mm or wider lens and want to shoot people. 1/60th of a second? Really canon? Yes, that might work for some people some of the time, but you give us no options? Idiots. Switch it to Tv and you can only shoot wide open? No one ever stops down? And what about manual mode? Why is it crippled to 400ISO? It'd work really well if I could dial in an aperture and shutter speed and you made it work regardless of the light, but you don't. And then you make it work PERFECTLY in video mode (only after we cried for 6~9 months) but not still mode? Really?

Yeah, that's a bit of a rant. Yeah, a lot of "pros" will say auto ISO is as bad as using green box mode. Some will also say canon's current theories for auto ISO work fine. Those same shooters must use really controlled light, not use wide primes and care about stopping action, and love to shoot wide open all the time.

Not to beat a dead horse, but Nikon's Auto ISO KILLS canon's all day, ever day (but it's still not perfect, it's slowest shutter speed is 1/2 or something like that, why can't landscapers get it to go all the way to 30 seconds guys?).

$.02
YMMV
My D700 has been shot using it set to Av and floating between 200 and 6400 giving me a shutter speed of no less than 1/125th since the day I got it. :D

love it!!!!

we have Av and Tv mode why not an intelligent ISOv mode.
meaning: have a few parameters to fine tune the auto ISO for each shooters taste.


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jacobsen1
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Dec 22, 2009 12:39 |  #6

zshaft wrote in post #9244970 (external link)
i will continue to answer your question number 2:
ISO 6400 5d2 equals with ISO 3200 of 40d (in my opinion).
ISO 1600 5d2 equals with ISO 800 of 40d.:D

I'd add a stop to that honestly. The 5Dii is a stop better than a 5D. The 5D is a stop better than the 40D. Basically, on the 40D I'd use 1600 in a pinch but knew it was going to have noise. 3200 on the 5Dii was flawless (provided you don't care about large files, even sRAWs get huge fast with a 5Dii and the ISOs turned up). 6400 was even good provided you nailed your exposure.

you could argue the stops between the bodies are less than a full stop, and that might be right. But I use round ISOs (whole stops) and 3200~6400 on the 5Dii were fine. With a D700 it's basically the same. Both bodies have 6400 that works, but there will be issues if you're not on your toes. The canon bands in the shadows, the Nikon bands at light sources INTO the shadows.


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aljaerouw
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Dec 22, 2009 13:43 |  #7
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How does auto ISO work on the 5D Mk II
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