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DPChallenge Forums >> Photography Discussion >> What ASA do you shoot at?
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04/07/2004 01:43:07 PM · #26
I tend to shoot at the lowest ISO that'll give me a sharp shot. With my 70-200 F4L I'll usually shoot at 400 when doing sports stuff. I don't hesitate to use 1600 on my 10D if it's necessary, but don't use 3200 much...this I think was f/1.4 at ISO 1600.



Message edited by author 2004-04-07 13:44:08.
04/07/2004 02:00:54 PM · #27
Choosing an ISO setting isn't too complex usually. What matters is the shutter speed you need to capture your desired image. When shutter speed is not an issue, I always shoot at the lowest ISO possible. When working from a tripod and shooting a still scene, I always use ISO 100.

When I am hand-holding the camera, I pay attention to my meter. If the meter is suggesting a shutter speed slower than 1/60 second, I will generally increase the ISO until I get to a speed I believe is comfortable for a hand held photo.

Camera shake becomes a problem in telephoto shots when hand holding. As a general rule of thumb, I try to use the fastest possible shutter speed to eliminate shake. With my camera, the ISO noise levels are completely acceptable up to ISO 400 and 800 in most cases. ISO 1600 will produce noise that is noticeable on screen and in print.

Noise isn't always a bad thing.

Hand-Held ISO 1600 Example

I photographed a band last weekend using my 50mm f/1.8 lens. The f/1.8 aperture still only allowed me to have a 1/15 second shutter speed for this shot. The available light was terrible. At ISO 1600, the noise is visible, but at ISO 800 or lower, the shot would have been impossible. Most of the photos I made on this shoot were no good.

Another ISO 1600 Example

This photo was also made at ISO 1600. The noise is barely visible in this image. The amount of available light plays a role in the amount of noise you will get.

Experiment with it.

:)

04/07/2004 02:05:52 PM · #28
I will shoot in 100 or 200 most of the time, I'll use 400 if I plan on converting to B&W as the noise will be more acceptable as grain. The 800 on the A1 is, sadly, nearly worthless.
04/07/2004 02:14:55 PM · #29
Its the conditions that dictate what I shoot at, at the moment the weather is not too good over here, not much sunshine about! I seem to use 400 for a lot of my shots at present but with the noise so low I often use 800 and 1600. I did manage a few shots at the weekend at 100! I wish the 300d went down to 50 for those hot sunny days we have over in the UK! I used to shoot Kodachrome 25 or Kodacrome 64 ASA as it was in those days I was sationed in Cyprus in the early 70's, on my film SLR. Kodachrome 25 really produced wonderful rich colours.

Taken at ISO 100 // Taken at ISO 800 // Taken at ISO 1600



Message edited by author 2004-04-07 14:28:29.
04/07/2004 07:36:01 PM · #30
Wow thanx all, guess my 200 setting is way off. And since I take most of my photos outside 50 may work well, at least 100 and no more.
04/08/2004 11:40:46 AM · #31
my camera's base setting is 160, so that's what i always try to shoot at, unless i really need to bump it up cuz of lighting.
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