 BetterPhoto Member |
iso In your Better photo book you recommend to keep your ISO setting low at 100 but in auto it is sometimes at 68 or so??
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- Bob Cournoyer Contact Bob Cournoyer Bob Cournoyer's Gallery  |
Hi, Robert...:-) In whose BetterPhoto book? If you are in a BP class, ask your question in the Campus Square for your class. Bob
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Brendan Knell |
68 would be lower than 100, so there would be less noise, but also less light.
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Pete H |
Hello Robert, If your camera is set to AUTO ISO, then the camera will select the most appropriate ISO for you depending on lighting conditions. (i.e) If the light is low, the camera thinks it is smarter than you and will raise the ISO to a higher level, as it thinks you may not be able to hand hold 1/30th sec etc... Not sure what camera you use, but I never use auto ISO, it takes away most of the control a photographer should have. Set your camera to 100 ISO if you want 100 ISO..Take it off auto. If you are shooting at 250mm at dusk, you may need to raise the ISO to 400 or higher if you want to hand hold the shot. Pete
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Alisha L. Ekstrom |
I'm no professional here, but on the ISO(at least with film..not sure about digital)...If you have a HIGH ISO then if you print 8x10 or larger then the image will be grainy versus if you just use ISO 100 then when you print large images they aren't grainy. Is this true??
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Kerry L. Walker |
Alisha, you are correct in that, with all other things being equal, higher ISO film has more grain than low ISO film. Underexposure will also show more grain. To add to that mix, some films are grainier than other films of the same speed. Also, the print grain index of films decreases as the size of the film increases. Thus, Kodak Portra 400NC in 120 format has less grain (in the same size enlargement) than Portra 160NC in 35mm size.
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