 John Chops |
Auto ISO Mode Hello, fabulous people! I was just curious how auto ISO worked. Why does it use, say, ISO 400 when it seems like it could have used ISO 100 (and increased the aperture)? Anyone?
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A C |
Messing with the aperture isn't always the answer. Your camera doesn't know if you're taking a picture of a group of people or just one person. A large aperture can kill a group shot. So you can't let the camera make all the decisions. I'll take a little noise with ISO 400 before having some of my subjects out of focus.
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John Chops |
So, if I set my camera to portrait mode, are there more chances for it choosing a lower ISO? And if I set my camera to landscape mode, I should expect bigger ISOs since it won't increase aperture?
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Jon Close |
Different cameras have different biases programmed into their full auto modes. Regardless, the full auto modes must make lots of decisions and compromises, and you the user wouldn't necessarily make the same choices. Best to shoot in modes that allow you to choose the ISO, aperture, shutter speed you want.
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W. |
Forget the scene modes. Those are for snapshots. Use Av, aperture priority, Tv, Shutter Speed priority, or even Manual if you want to control your camera.
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Bunny Snow |
I almost always use manual mode so I can control my aperture or shutter speed. I start at the lowest ISO (International Standards Organization)first because that has the lowest digital noise. However, it depends upon the lighting and my subject, and what I want to happen to my depth of field or my ability to stop action. There are three things that control light in the camera: aperture, shutter, ISO. I increase my ISO if I cannot achieve what I want with the other controls. Personally, I don't use the scene modes, because I've learned how to create less or more depth of field myself. I suspect that you don't have as much choice with the scene modes as you would with Av, Tv, Program, or manual. But, I've been a student of photography for decades.
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Bernard |
Cassie ISO settings determine the cameras sensitivity to light. the higher the ISO the more sensitive to light the camera become, and you can take photos in darker invironment, A usually unwanted side effect is with this increased sensitivity to light the sensitivity to noise also increases, this noise can show in your photo's. oh yes! no need to remind me that I'm fabulous, I'm usually to modest to admit it, but I know.
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Pete H |
Cassie, Auto ISO does have at least ONE great use that I can see. I have used it at times, and it has saved the day for me. For the most part however, ISO is yet another parameter photographers prefer to have control over, so we set it as we desire. Rarely is "auto" anyting a good thing. LOL Pete
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Bunny Snow |
As you become used to your camera, slowly go into the creative mode (if you are using a Canon). Discover when to use Program AE, then Tv (Shutter Priority) and Av (Aperture Priority). I found that Av generally needs a tripod unless the light is quite bright. I generally prefer shooting portraits and wildlife, and well as flower in open shade to avoid the harsh sunlight on the subjects. This is what I did when I first bought my Canon Elan (film camera) and then my 20D. I found that the automatic exposure mode limited my creativity and I became frustrated. Now, that I'm used to my cameras, I always use manual mode. While this is not a prize winner, one cannot take pictures like this in auto mode. Bunny
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Bunny Snow |
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