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09/22/2005 12:51:12 PM · #1 |
| Last weekend I was taking pictures outside around town. I was shooting with an ISO of 100. I noticed after I got home and uploaded all my pictures that the shots taken in bright sunlight were in focus and sharp, however shots that were taken in shade were slightly out of focus as if I had moved the camera to much when shooting. The only thing I could think of was that perhaps shooting at ISO 100 was the cause. Was it? And whats a good guide for deciding what ISO to use for shooting in certain situations? |
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09/22/2005 12:52:59 PM · #2 |
| Your shutter speed probably decreased significantly when shooting in the shaded areas with the ISO set at 100. Because of this you probably are noticing hand shake in your images. |
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09/22/2005 01:03:31 PM · #3 |
such a taboo thing to say in a digital photo forum - but your best referance is to buy a roll of film and keep the box in your camera bag until you know it by heart.
50iso is for very well lit bright light situations
200-400 is average lighting (the kind of film you buy at the supermarket is generally 200 or 400)such as a regular outdoors day
800 plus is for low light situations
3200 is good for dark concerts where you cant flash and small dark places like caves. |
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09/22/2005 01:13:55 PM · #4 |
I just go by shutter speed. I'll flip to higher ISO only if I cannot get the shutter speed needed to get the shot without blur, which usually means 1/focal-ength secconds. Shutter speed is the key.
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09/22/2005 01:16:14 PM · #5 |
What mode were you shooting in (Av, Tv, landscape, etc.)?
In all modes except Tv and M, your camera will select the shutter speed based on other variables, including it's own metering of the available light in your composition. You can always see the shutter speed selected through the viewfinder by doing a 1/2 press of the shutter button. Generally speaking, if it's less than 1/60th of a second, you'll probably not get good shots.
I don't know how familiar or experienced you are with your Rebel, so I hope this wasn't condescending. Learn those settings if you don't already know them. This is the huge advantage of an SLR - you can control all the variables! |
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09/22/2005 01:21:48 PM · #6 |
| You could increase the ISO, or the other variable is you could open up the aperture, if that's appropriate for the shot. For example, if the aperture was set at f11 and the shutter speed was at 1/100, then opening it up to f8 would allow you shutter speed to half the sutter speed to 1/200, which may have been sufficient. |
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09/22/2005 01:24:47 PM · #7 |
I am pretty new to the digital SLR world. For years I have been using point and shoot digital. Years ago I did do a lot of film photography for a class in high school which is why I thought it was the ISO that was the cause. But a lot of things are coming back to me, and I still do a lot of shooting in program P mode. Im working my way into using the other modes more.
Thanks for all the answers/advice. |
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09/22/2005 01:30:48 PM · #8 |
| Also A higher ISO will usually result in higher noise but so will having longer exposure times. Best thing IMHO is to bring alon a tripod and adjust settings like iso and apature exposure time, and take the shot several times and dont delete them until you get them to your comp and see how they turned out. Is more of a trial and error but you will get a better idea how changing these will affect the image and after a while a feel how to use them to get the best shot. But if your in low light use a tripod to get the camera still. I often use a IR remote to take my dark shots, will usually zoom/focus, step back and hit the ir switch to reduce shake as much as possible |
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