Beginner's question on A vs. M :)

Started 5 months ago | Discussions thread
Yxa
Yxa
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Re: Wrong - you need EC anytime you use auto-ISO
In reply to Robin Casady, 5 months ago

Robin Casady wrote:

Ray Sachs wrote:

wireless wrote:

Ray Sachs wrote:

[...]

You're wrong.

You know the back in the days of newsgroups, we used to say, the best way to get correct information on the internet is to post incorrect information.

[...]

In any case, if you're using auto-ISO and you want more or less exposure, you still need to use the EC dial...

I see that now, like you said...

Nice photos by the way. Your PP restraint is tasteful.

regards, David

Thanks David. And glad I could help clear this up for you.

IMHO, auto ISO is just recently coming into it's own as a highly useful tool as the new sensors come in with such an amazing amount of latitude. I've thought Nikon's auto-ISO implementation was the smartest I'd seen until recently. Now more companies are starting to use similar approaches - Samsung and Fuji come to mind - I'm sure there are others. But some, like Sony, Olympus, Panasonic, and others either haven't figured it out yet or just haven't decided it it's an important issue yet. But it's an important and flexible tool if the logic allows for as much user control of the parameter as Nikon's approach. When sensor's only had 3-4 stops of ISO latitude to offer, auto ISO was very limited in what it could do and it was no tragedy when it was implemented badly. But with sensors that can now shoot well at 12,800 and incredibly well at 6400, it's a tool with all sorts of potential. And one worth getting to know...

It is important to remember that—just like aperture and shutter speed—ISO changes have consequences. At ISO 12,800 on the D800E you have lost 6.5 stops of DR and are down to less than 5 stops. At 6400 you are down to less than 6 stops of DR. Just dropping to 200 from the base ISO of 100 you lose more than 3/4 of a stop. Two stops are lost at ISO 500, and 3.6 at 1600. If you expect to pull detail from shadows, this can be an important aspect to consider when deciding on exposure settings.

You also lose resolution as noise increases.

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Robin Casady
http://www.robincasady.com/Photo/index.html
"Get your facts first, then you can distort them as you please."
—Mark Twain

Yes @ 1600 ISO you are at the Canon-DLSR levels and that can't be good

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