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05/02/2003 03:05:43 AM · #1 |
we can manually set the ISO speed and also the shutter speed. So, any point on WHEN to use which? what sort of situation?
Lets say if I want to shoot an F1 car driving past, should I set to ISO 400 or should I use a "shorter" shutter speed? or both?
what about low light conditions without a tripod? Higher ISO or faster shutter?
Pls shed some light, thanks! |
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05/02/2003 03:51:46 AM · #2 |
Each situation is different. If action is the most important thing in the shot (either stopping the action or showing motion) then the shutter priority is the way to go. The aperture will be adjusted automatically by the camera, letting in light to ensure the proper exposure. Aperture priority is used for controlling light entering the camera, so if the light level is the most important thing in the shot, use this setting. The shutter speed will be adjusted automatically to compensate for the light levels. So, aperture for light and shutter for action. Ultimately the shutter speed needs to be high enough to avoid unwanted blur if you're handholding a shot that needs to be sharp.
ISO is simply the sensitivity setting of the sensor, which will increase with the ISO number. If you're shooting something with aperture priority or shutter priority and the light levels aren't sufficient, you can increase the ISO level to compensate. However, the noise in the image will increase with each ISO increase. It's best to keep the camera at the lowest ISO value if the other settings are sufficient to produce a proper exposure. If not, then bump the ISO up.
Low light conditions, well, use a tripod if possible and use aperture or shutter priority mode as above. Again, keep the ISO as low as possible to satisfy the needs of the shot. If there isn't enough light at the widest (lowest #) aperture to produce a satisfactory shot, then increase the ISO.
I find that the higher ISOs are very useful for low-light photography in order to keep the camera's shutter speed high enough (when I'm in aperture priority mode) to handhold shots. ISO = more light but more noise.
That's probably confused you even more! |
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05/02/2003 04:16:05 AM · #3 |
Hi Vic,
I'm not a professional or anything but I'll tell you how I use those features:
1. I never touch the ISO setting (leaving it at its lowest value) unless:
-The lighting conditions are so bad that it wouldn't be possible to take a descent shot without changing them: for instance your F1 car at a very cloudy day, or
-you want to make a more artistic shot, with grain (and even here it differs from traditional film camera's: film with high ISO produces nice artistic noise, while with digital it's mainly destructive color noise. I myself only use it when I'm planning to convert the shot in black and white afterwards).
The last one is mainly the reason that I don't play around much with the ISO setting: Except if you use a DSLR, the higher ISO setting produces lot's of color noise, especially at 400 and higher. (I think with a Canon 10D for instance, you could easily experiment with a few ISO settings without losing lots of information on your photo.)
2.When you want to freeze fast running objects (like a F1 car), youl'll have to bump up your shutterspeed. Only adjust ISO when the light isn't sufficient for your chosen shutterspeed. (First try to shoot it from an other angle: that could help too).
More rewarding, though, is when you use slower shutter speed and try to move along with the passing object: that causes the background to be blurred, wich increases the illusion of high speed. This takes some practice, but it is much more rewarding than a 'freezed' shot of that F1 machine, wich lookes like if it is standing still on the court. With this technique it's also possible to shoot with less light without having to adjust the ISO.
3. When you shoot at low light without a tripod: if you don't use a flash, you'll have to set your shutterspeed to at least 1/125 to avoid blur because of camera movement. But same thing here: First try out all other options (adjusting aperture, putting the camera on a rock, lean against a tree for stability, other shooting angle....) before you adjust the ISO.
I hope this has cleared a few things up for you. I stress though, that it's based on my short experience, and with my camera, so it could be interesting to do more research.
Greetings,
Marco
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05/02/2003 04:48:11 AM · #4 |
| Thank you guys. Now it makes more sense than having to understand ISO and Aperture meanings! I mean, whatever i read from the net, tells me WHAT is ISO and WHAT is Aperture value but not enough "real life" examples on how to APPLY those knowledge. You guys are cool. Thanks. |
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05/02/2003 05:31:18 AM · #5 |
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