iso speed?
Jan 5, 2013 11:05:25 #
I enjoy reading camera review's and photography magizines. I have read where camera expert's refere to iso as a "speed" instead of a "setting". I can totally understand the shutter setting being feferd to as a "speed" but iso?
Jan 5, 2013 11:25:25 #
cjkorb wrote:
I enjoy reading camera review's and photography magizines. I have read where camera expert's refere to iso as a "speed" instead of a "setting". I can totally understand the shutter setting being feferd to as a "speed" but iso?
I think what they are alluding to is the higher the ISO the more light it lets into the sensor, which when worked in combination with the aperture will give a faster reading. This does not necessarily mean your image is better because it can cause noise problems.
Jan 5, 2013 11:52:09 #
ISO speed refers to the cameras sensor's sensitivity to light. The higher the ISO, the more sensitive, thus allowing a faster shutter speed to produce the same exposure using the same aperture and shutter speed. For an example of this, shoot a picture of a dimly lit subject at say, ISO 100, then only increasing the ISO to say 800, take the same shot again. Notice the difference? You will also notice more digital noise at higher ISO settings (In the film days, this was known as grain). Different cameras can vary greatly in their high ISO performance, and noise is generally not preferred except in certain situations where the photographer is going for a certain look i.e., Black and White shots where the the photographer wants an old time feel to the shot.
Jan 5, 2013 11:56:20 #
Jan 5, 2013 12:35:26 #
Sorry...I may be making a mountain out of a mole hill here. thanks for the comments. I understand the three elements of photography but when a person selects a higher iso, that person isn't speeding it up, it's just making the sensor more sensitive to light.
Jan 5, 2013 13:24:07 #
cjkorb wrote:
Sorry...I may be making a mountain out of a mole hill here. thanks for the comments. I understand the three elements of photography but when a person selects a higher iso, that person isn't speeding it up, it's just making the sensor more sensitive to light.
...Thus allowing you to choose a faster shutter speed.
Jan 5, 2013 15:44:18 #
Xtreme66 wrote:
...Thus allowing you to choose a faster shutter speed.
Yes...I understand but your able to make the shutter faster, not the iso.cjkorb wrote:
Sorry...I may be making a mountain out of a mole hill here. thanks for the comments. I understand the three elements of photography but when a person selects a higher iso, that person isn't speeding it up, it's just making the sensor more sensitive to light.
...Thus allowing you to choose a faster shutter speed.
Jan 5, 2013 16:19:35 #
cjkorb wrote:
Sorry...I may be making a mountain out of a mole hill here. thanks for the comments. I understand the three elements of photography but when a person selects a higher iso, that person isn't speeding it up, it's just making the sensor more sensitive to light.
You're correct, but it is a colloquialism we use just as we say an f/2.8 lens is "Faster" than an f/4 lens. Like many technical pursuits, there's a lot of jargon that sometimes makes little sense when you analyze it. You say you have a "bug" in your computer but, do you really? (Actually, the original Eniac computer got an isect in it that caused problems, and the name stuck.)
Jan 5, 2013 16:25:50 #
cjkorb wrote:
I enjoy reading camera review's and photography magizines. I have read where camera expert's refere to iso as a "speed" instead of a "setting". I can totally understand the shutter setting being feferd to as a "speed" but iso?
Kinda OT...
I'm "old school"... I still refer to "shutter duration"....
:thumbup:
Jan 5, 2013 16:27:32 #
The term "speed" in reference to sensitivity is really just a holdover from the film days. Back then, it was referred to as ASA (American Standards Association), and the term film speed was used to describe the light sensitivity of the film.
Jan 5, 2013 17:43:31 #
cjkorb wrote:
ISO (ASA) is what was referred to as the speed of the film. It still carries that description today as the analogy also applies to sensor sensitivity. Sorry...I may be making a mountain out of a mole hill here. thanks for the comments. I understand the three elements of photography but when a person selects a higher iso, that person isn't speeding it up, it's just making the sensor more sensitive to light.
So much of the photographic terminology used today originated with film.
Jan 5, 2013 18:31:15 #
cjkorb wrote:
Sorry...I may be making a mountain out of a mole hill here. thanks for the comments. I understand the three elements of photography but when a person selects a higher iso, that person isn't speeding it up, it's just making the sensor more sensitive to light.
It is "Speeding up" the sensor's capture of the light.
Jan 5, 2013 18:33:27 #
cjkorb wrote:
Sorry...I may be making a mountain out of a mole hill here. thanks for the comments. I understand the three elements of photography but when a person selects a higher iso, that person isn't speeding it up, it's just making the sensor more sensitive to light.
Yes...that's right. using the term "speed" is just a throw back from film days when film was slower or faster speed...and you loaded higher ISO film because it was more sensitive to light.
Jan 5, 2013 19:24:25 #
OK...I remember back in the film days, I mostly bought iso 200 film. I remember it being refered to once in a while as speed, it didn't make much sense to me back then as now. So, when you bump up the iso to, say 1600, that's considered faster than iso 200. Thanks for taking time to comment, I just couldn't make much sense of the termonolgy.
Jan 5, 2013 19:34:42 #
cjkorb wrote:
So, when you bump up the iso to, say 1600, that's considered faster than iso 200.
Yep!
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