Author Topic: ISOs  (Read 3258 times)

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Offline Ballacraine

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ISOs
« on: April 09, 2010, 07:18:15 PM »
I am going to ask a noobish question here.

Are the ISOs as applied to digital photography the same as with film?

What setting of digital ISO should I be using for motorsport?

Thanks for your tolerance. ;)

Balla. :cool:
Is it chaos out of order, or order out of chaos?...... I am never quite sure.

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Offline zekewhipper

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Re: ISOs
« Reply #1 on: April 10, 2010, 05:01:21 AM »
Yes, and set your ISO to whatever you think will help you take the shots you want.
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Offline rogprov

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Re: ISOs
« Reply #2 on: April 10, 2010, 07:10:43 AM »
Digital ISO is much the same as film but they don't necessarily exactly match.

I'd suggest using the lowest ISO setting which will enable you to use the highest shutter speeds you'll need for the shots envisaged. I guess you'll need quite high shutter speeds for motor racing so, on a good weather day, you'll probably need an ISO of 400 to enable shots at 1/1000th or so - but it all depends how good the light is at the time. A little experimentation will soon show what's best.
Roger

Offline Ballacraine

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Re: ISOs
« Reply #3 on: April 10, 2010, 02:01:48 PM »
Thanks for the replies.

Pretty much the same as film then, as a starting point.

Balla. :cool:
Is it chaos out of order, or order out of chaos?...... I am never quite sure.

http://www.flickr.com/photos/ballacraine/
( Not much in there yet.....Gotta sort & upload ;) )

Offline pointblank

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Re: ISOs
« Reply #4 on: April 11, 2010, 02:54:37 AM »
Yup, not really any difference. For high speed action I normally work with ISO 160, it gives me just that right balance for the circumstances. My shutterspeeds don't really bother so much as I typically shoot between 1/50 and 1/200 but most of the times on the slower side panning from a monopod.

Offline Theresa

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Re: ISOs
« Reply #5 on: April 11, 2010, 02:15:07 PM »
Did you mean ISO 1600?
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Offline tpe

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Re: ISOs
« Reply #6 on: April 11, 2010, 02:19:51 PM »
Recently I compared iso 400 film with my a700, it seems that the 400 film was about as grainy as a700 set to ISO 3200. Dont be afraid to push the ISO a bit. I also get better noise reduction by using photoshop and swithching high iso noise reduction off in the camera settings.

Tim

Offline pointblank

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Re: ISOs
« Reply #7 on: April 11, 2010, 03:31:27 PM »
Did you mean ISO 1600?

Nope, 160. Light is plenty available in the tropics :-) I'm using the 70-200/2.8 and the combination with this ISO choosing a shutterspeed between 1/50 and 1/125 pushesmy aperture to the smaller side but with panning I am not bothered about that. For your info, I never shoot above ISO400. That's what fast lenses and a tripod are invented for ... lol ..

Offline Clive

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Re: ISOs
« Reply #8 on: April 12, 2010, 01:56:52 AM »
Balla,

My A700 is set at ISO 400 most of the time. But a lot of the time I have a tele attached. If the light is good and I am shooting stationary subjects (either with tele or the CZ1680) then it is set at ISO 200. Last year, to shoot lightning where I was looking for long exposures I used ISO 100.

Probably 95 percent of my images are shot at ISO 400.

You'll probably want ISO 400+ for your motorsports...most (most) of the time you will never see noise. On gray days you will pick up noise in clouds and dull parts at ISO 400. Interesting....if you really want fast shutter speeds use ISO 800 when the sun is shining. In good light you will see virtually no noise at ISO 800.

I agree with tim's findings. Digital ISO 400 is way cleaner than film ISO 400. We are sooooooooooo lucky to have decent images at such high ISOs ... we are doing things we could not even dream of 20 years ago. How cool is that?

Kodachrome 25 or Kodachrome 64 anyone? ;)

Have fun!

Clive
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Not everything that counts can be counted, and not everything that can be counted, counts. Albert Einstein

Offline rogprov

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Re: ISOs
« Reply #9 on: April 12, 2010, 06:17:48 AM »
.....
Probably 95 percent of my images are shot at ISO 400.
...
Clive

Same here Clive, I rarely use any other speed than ISO400 - except in extreme situations. I find I get next to no noise with the a900. Been playing with the new IDC 3.2 and find it very good above ISO800 to the point that I may start using those higher settings to get a faster shutter speed or deeper DoF with my macros.
Roger