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What Does ISO Mean In Photography?

 
 
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Rasa N.
Rasa N.
ID: 166375
Posts: 521
Date: 2007-01-31 08:25
I know that its some kind of standarts, but what are they?
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Skip Nall Photography
Skip Nall Photography
ID: 179752
Posts: 12
Date: 2007-02-02 00:11
Basically the amount of light required to get a good exposure...put simply. the faster the ISO rating the less light needed to get a faster shutter speed or a smaller fstop...so ISO 50 needs lots of light...ISO 3200 needs much less...

Glen Arreglo
Glen Arreglo
ID: 174604
Posts: 63
Date: 2007-02-03 19:50
ISO international standards orgnization. Film speed rating i believe also same as ASA american standards association

Gabriel Silva
Gabriel Silva
ID: 174163
Posts: 56
Date: 2007-02-03 20:28
And in digital photos, when not using dSLR camera, setting the equivalent ISO/ASA to a high number will cause "noises" (cropped color) in the picture, because it increases the digital sensor to capture more light, so it captures "noises" too.

Make the experience with your cell phone if it has Camera and Night Shot options, take a snapshot with night mode ON and OFF and see the noises caused by the night shot in the digital picture (high equivalent ISO).

:thumbup: ,
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Glen Arreglo
Glen Arreglo
ID: 174604
Posts: 63
Date: 2007-03-10 06:00
i forgot digital photography has also embrased ISO and ASA thing

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Date: 2007-03-29 12:12

Got the time
Check this out/ Great info and photo


ISO Settings for your digital camera [New Window]
What are ISO settings and what does ISO mean? ... The major headache with film photography was that if you wanted to change the ISO settings, ...
http://www.all-things-photography.com/iso-settings.html [Preview This Site]

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Larry F.
Larry F.
ID: 179376
Posts: 841
Date: 2007-03-29 12:23
ISO (Sensitivity)

ISO is the number indicating a digital camera sensors sensitivity to light. The higher the sensitivity, the less light is needed to make an exposure.

Digital cameras automatically select the ISO but most have a setting to change it manually. Auto ISO generally works best for bright scenes.

Shooting at a lower ISO number requires more light than shooting at a higher number. Lower numbers result in images with the least visible noise, which is desirable.

The higher the number, the more noise. The amount and degree of noise varies from camera to camera.

Digital single reflex cameras (DSLR), because they have larger sensors, are best for producing noise-free images. However, some consumer digital cameras now have improved sensors that produce acceptable images at higher ISO.

ISO settings

AUTO ISO - digital camera automatically sets the ISO speed according the brightness of the scene, increasing or decreasing the sensitivity. User has no control over which ISO number is used.

ISO 50 - 80 - for taking photos in bright light; excellent for close-ups, landscape, and portraits. Produces fine detail and image quality.

ISO 100 - for extra sensitivity with little, if any, reduced image quality.

ISO 200 - cloudy and overcast days. Acceptable image quality, with some visible noise.

ISO 400 and above - suitable for indoor photography whether or not a flash is used. Useful for "stop-action" and sports photographs. Most compact digital cameras produce high to very high image noise.

Changing ISO also changes the aperture and shutter speed.


hope this helps

Awkward Morning Productions
Awkward Morning Productions
ID: 191761
Posts: 22
Date: 2007-04-26 13:20
All these guys are right on.

Remember that for the best quality images, shoot on the lowest ISO you can.

As a result you'll have to open the aperture wide and possibly need a longer exposure. You can get GREAT night shots by shooting with a relatively low ISO, a tripod, and a small aperture (large f/stop).

Peronally, I shoot on the lowest ISO possible, at the expense of longer exposures. I never regret that decision when I am blowing up my pictures to sell as posters, or cards, or 8x10's, etc.

I'm biased towards low ISO :)

Mark Hiatt
Mark Hiatt
ID: 190301
Posts: 20
Date: 2007-05-08 13:20
Now, in Europe, you can still find film rated on the DIN scale. Agfa, I believe still has some film using this rating. What does DIN stand for?

Charles Griffin
Charles Griffin
ID: 183878
Posts: 1184
Date: 2007-05-08 21:08
Straight from Wikipedia:

DIN Deutsches Institut für Normung e.V. (DIN; in English, the German Institute for Standardization) is the German national organization for standardization and is that country's ISO member body.
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Adi Rasid
Adi Rasid
ID: 182203
Posts: 201
Date: 2007-05-08 21:23
Sensitivity to light. The higher the number.. the brighter the photo gets. If you want it simple that is. But to photographers.. they have lots of other facts relating to ISO that to them.. the simple explanation can be misleading. That's my opinion.

Nathan Hill Photography
Nathan Hill Photography
ID: 190390
Posts: 76
Date: 2007-05-17 10:31
ISO is simply the amount of light the chip, or rating of the film the size of the light sensative crystals in the film, higher ISO means less light, but more grain in the image. Lower light requires a higher ISO or ASA rating, but because of the higher sensativity there is going to be more drop out or grain (basically spots) in the photo. Depending on what you want to accomplish this can be overlooked for artistic reasons.

Basically higher ISO means more grain, and since digital cameras repilcate film it means the same.

Malcolm Salmond
Malcolm Salmond
ID: 209819
Posts: 81
Date: 2007-09-27 22:04
Image quality is generally improved by using slower film, i.e. lower ISO. This does not translate directly into digital photography. With a digital camera image quality is a combination of lens, capture device (CCD, CMOS), the software used to process the image data in the camera, and the in-camera storage options (TIFF, RAW, JPG, etc). Your best image quality will come with shooting at the camera's default ISO setting, which is generally 200. This matches the capture device with the software. Lower ISO settings on a digital camera will give you options of slower shutter speeds or a more open diaphragm but will not give you a better image like you would get with film. All of the observations of shooting at a higher ISO are accurate.

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Total results: 13
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