Whats ISO Mean?

DJMorgan

DJMorgan

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Daniel
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Your probably thinking, What a dunce:cuckoo: BUT I`m new to the photography scene, so could anyone define what the ISO is please? :thumbs: Thanks :D
 
International Organization for Standardization (ISO)


edit...sorry posted wrong section
 
Have a read HERE
 
dcash29 said:
International Organization for Standardization (ISO)
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Doesn't really sound like anything that has a place in art does it.
 
Thanks guys =], I took one with my gfs camera which is a 7.2 Sony camera, but my Nikon D3000 Is due to arrive tomoz, if not next week due to weather conditions, but yeah, I took one photo is a ISO of 100, And another with 1000 ISO And I noticed the difference.
 
dcash29 said:
International Organization for Standardization (ISO)
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:thinking: Wouldn't that be IOS ?

How about International standards organization ... :cool:
 
GOOGLE, BING, ALTA VISTA, LYCOS, WIKIPEDIA, these are your friends who can answer questions if you care to ask them


The current International Standard for measuring the speed of colour negative film is called ISO 5800:1987 from the International Organization for Standardization (ISO). Related standards ISO 6:1993 and ISO 2240:2003 define scales for speeds of black-and-white negative film and color reversal film. This system defines both an arithmetic and a logarithmic scale, combining the previously separate ASA and DIN systems.

In the ISO arithmetic scale, corresponding to the ASA system, a doubling of the sensitivity of a film requires a doubling of the numerical film speed value. In the ISO logarithmic scale, which corresponds to the DIN scale, adding 3° to the numerical value that designates the film speed constitutes a doubling of that value. For example, a film rated ISO 200/24° is twice as sensitive as a film rated ISO 100/21°.

Commonly, the logarithmic speed is omitted, and only the arithmetic speed is given; for example, “ISO 100”.
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Cor blimey. I'd forgotten about the Din system until reading that. If I remember rightly, the old Agfa slide film I used to use was Din rated.
 
whiteflyer said:
GOOGLE, BING, ALTA VISTA, LYCOS, WIKIPEDIA, these are your friends who can answer questions if you care to ask them
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And the enemy of forums. If everyone searched google before asking a question do you think that this forum would be very active? How many topics on here do you think have only ever been covered once? My guess is that the place would be pretty boring if everyone used google rather than asking a friendly face. :(
 
ISO relates to film speed.. before digital...
But relates the same... the quicker the ISO.. (higher no.) the more grainy (film).. the more noisy (digital)
When u dont have enough light.. u up the iso. U get away with the lowest number possible for clearer shot.. light permitting.
 
Trev Rich said:
ISO relates to film speed.. before digital...
But relates the same... the quicker the ISO.. (higher no.) the more grainy (film).. the more noisy (digital)
When u dont have enough light.. u up the iso. U get away with the lowest number possible for clearer shot.. light permitting.
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not quite,,,,
iso is taken from the greek isos ,meaning equal ( if it was french it would be oin ) its a standard set down so that everybody can make films, sensors ,cranes and many other things the same ,so that when you use them they do the same thing ,,,iso 400 should give the same settings with a sensor as with film ,,, its so that we can all sing from the same hymn sheet (nice )
 
TriggerHappy said:
And the enemy of forums. If everyone searched google before asking a question do you think that this forum would be very active? How many topics on here do you think have only ever been covered once? My guess is that the place would be pretty boring if everyone used google rather than asking a friendly face. :(
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:thumbs:
 
TriggerHappy said:
And the enemy of forums. If everyone searched google before asking a question do you think that this forum would be very active? How many topics on here do you think have only ever been covered once? My guess is that the place would be pretty boring if everyone used google rather than asking a friendly face. :(
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Agreed. The forum not only allows you to ask the question but also gives you the opportunity to discuss the answers. Remember, just like google etc, TP and its members are resources. ;)
 
fabs said:
Remember, just like google etc, TP and its members are resources. ;)
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Sometimes :lol:
Other times they are just a pain is the ar..... :D
 
billyd601 said:
so if ISO was for film what was ASA for?
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iso is'nt just for photography ,,,its a lets all have the same standards when we build/produce/make anything organisation

asa/din american/german
 
ASA = American Standards Association. The British one is BSI (British Standards Institution), and the european one is EN (Euro Norm). Many international standards are also issued as BS and EN, and vice versa, although the content is actually the same.

I seem to recall reading a Geoffrey Crawley article in AP saying the true ISO of many sensors differed between manufacturers, and there wasn't necessarily a correlation with the ISO of films (although that may have been the case with films?). It seems to be more an indication of sensitivity than a true measure of anything.
 
its the number in your camera which gives you sensitivity to light
in the digital camera range the one which also gives less noise...
lower the better
 
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