What ISO Speed do you mostly shoot at?
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Traditionally, lower ISO sensitivity = less grain but less light, and vice versa.
I'm limited to ISO200 by my camera, but what ISO speed do you generally use and why?
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I used ISO100 whenever possible; just to avoid grain (it's also a smaller file size, so I can take more pictures!!!)
Whenever possible = sunny day outdoors, long exposures at night when I'm using my tripod
Other times when I'm indoors, depending on the lighting, I'll be using ISO200.
and almost at all times, I don't use a tripod indoors.
I'll try to take a picture, and if I've got the aperture wide open, and can't get a fast enough shutter speed, I'll raise the ISO and try again.
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ISO100 = smaller file size??
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For 95% of shots 100.... once or twice in poor light and trying to stop fast action I'll go higher, but no higher than 400.
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I'm also limited to 200. I don't see too much noise (barely any) at this setting so it's acceptable to me.
I'm not sure about the smaller size... it's all a ccd to me!
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I have noticed that less colour variation=smaller files size... not sure about the lower ISO... maybe the extra colour in the noise adds to the file size.. just to add insult to injury!!
Anyway, I generally shoot 50 or 100 if there's enough light then I jump to 400... I almost never shoot 200 for some reason. I notice a much bigger difference in quality from 100-200 than from 200-400 so I usually just maximize the light and jump to 400 to keep the shutter-speed up.
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ISO 50 - I generally shoot Velvia slide film. On my digitals - I typically shoot ISO 64.
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I normally have it set to 100. When I used my A40 it was at 50 iso most times. I have had times where 1600 was necessary. I find the noise levels pretty low at high iso settings on my D-Rebel.
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You name it! Although I very rarely shoot at 1600, I do a lot of low light at 800 and if the image is quite bright the noise level isn't as strong. I spend most of my time at 400 unless its bright or in the studio.
The only problem with higher ISO speeds is that your colour saturation drops off fairly quickly.
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the smaller files size is just an assumption from the fact that my camera decreases the estimated pictures remaining when I increase the iso, and when I decrease the iso, it increases the number of pictures I can take. That's where I got the idea from... ~
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Oooh interesting... perhaps the jpeg compression works better on less noisy images because the tonal gradations are smoother...?
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So many big words in one post! my head can't comprehend! or maybe because of study study study all day long and it's time to sleep!
I usually shoot in RAW now, so the jpeg compression, I guess will only affect the embedded medium JPEG which is saved with the RAW file.
But what you say sounds true! I think
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The more detail that is in your shot makes for bigger files too, if you have a subject with very shallow DOF the blurry bits take up a lot less space.
Like that techinimical explanation?
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