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01-24-2011, 09:37 AM   #1
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ISO and Auto Mode

I've only been using my K-X in auto pict mode. Today I took some outdoor pics of a house in bright sunlight and snow. I thought auto mode would lower the ISO speed but it didn't-it set it at 1600. When I looked at the pictures on my laptop at 100%, you could see graininess-something I wouldn't think I'd see on such a bright day. I set the ISO to 200, as an experiment, and the graininess went away. When I set the mode to Landscape, 1600 was chosen again.

I'd still like to use Auto mode and would like to get nice shots. Do I always have to fiddle with the sensitivity setting, or can I set a parameter for Auto mode?

Thanks.

01-24-2011, 09:49 AM   #2
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Don't use auto pict mode. Use Av, and select your aperture.
01-24-2011, 10:02 AM   #3
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Or since you want clean images, use Sv, sensitivity mode and set you sensitivity to 200
01-24-2011, 10:28 AM   #4
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I would suggest P mode with the ISO set to a range of 100-800 to start. Once you get a handle on things, Av mode is a nice next step.

01-24-2011, 10:35 AM   #5
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Thanks, all.
01-24-2011, 10:55 AM   #6
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Right. Auto still lets you set the ISO manually. (On my K10D at least) You had probably set it to 1600 earlier and forgot about it.
01-24-2011, 11:25 AM   #7
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I assume that the follwoing is happening:

If you use the landscape scene mode, the camera will try to use a narrow aperture (high number) to give a deep DOF. To achieve this it either needs to use a slow shutter speed or increase the ISO or a mix of the 2 for correct exposure. The camera might well have choosen a quite fast shutterspeed to prevent camera shake affecting the image and therefore had to crank the ISO to 1600 for correct exposure.
01-24-2011, 12:09 PM   #8
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It was very bright and snowy.

I mis-read that previous post about changing the range of the auto-ISO, but wound up finding it myself before popping back on the forum. That abilty to set range is indeed convenient, but I wonder if it will always choose the highest ISO in Auto mode. I found the graininess pretty obvious when viewing at 100%. If I recall, Kodak Tri-ex, or something like that, was considered fast at 400, back in the day.

01-24-2011, 01:14 PM   #9
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It should default to the lowest ISO in auto mode, unless available light dictates otherwise. If you got pics at ISO1600 on a bright, snowy day, it must have been set to 1600 and not auto. If you post a pic, we can look at the EXIF and see exactly what all the settings were and try to go from there.

But also, Auto mode is really not the place to be. Switch one click over to P.
01-25-2011, 05:19 AM   #10
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Ok. I'll try P, but the ISO was set to 200-1600.
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