Why Need High ISO

[Miki-chan]

1. When you plan for a grainy look (but IMO, film grain looks so much better than electronic noise)

2. When you need high shutter speed and the light is not enough. Example: Sports & Concert photography

3. When you cannot comprimise the shutter speed and you're not allowed to use flash to fill up

4. When the light is really at its minimal and you don't want your flashlight to be the keylight, In other words, still maintaining the light intensity of background in your photographs

 

[leithunder]

For macro shots is high ISO required?

 

[zac08]

For macro shots is high ISO required?

No...

ISO of 400 is sufficient.

 

[deepseablue]

To get noise!!:thumbsup:

sorry, but why do u want noise? i tot noise is unwanted as the pic is not as clear/clean?

 

[zac08]

sorry, but why do u want noise? i tot noise is unwanted as the pic is not as clear/clean?

It's a form of effects...

 

[user111]

Why or when do we need to take pictures at high ISO?

to increase sensor's sensitivity in low light situations. just like in the old days when we use high speed film

 

[oinkoinkpig]

hmmm does it mean if e.g my iso is increase to 800 and i increase my shutter... my quickest moment will be captured? :dunno:

 

[zac08]

hmmm does it mean if e.g my iso is increase to 800 and i increase my shutter... my quickest moment will be captured? :dunno:

Yup.. with sufficient light, you can do that.

But in bright daytime, it may be too much and you may need to reduce the ISO speed down.

 

[Scaglietti]

It all boils down to light...

There are 3 inter-related parameters:

1. Aperture
2. Shutter speed
3. Sensitivity

To create an image, you need the right among of light. You vary each one of the 3 parameters to get the image you need or to circumvent the limitations.

For example, in a low light situation, you to get the appropriate amount of light to create an image, you can:

1. Use flash

2. Use a fast lens (lens with large aperture, e.g.f/1.4, 1.8 or 2.8, some of these lens are heavy and expensive, especially zooms and telephotos)

3. Use a slow shutter speed (probably need a tripod to prevent camera shake, not suitable for moving subject)

4. Use higher ISO (high ISO tends to exhibit more noise and have lower resolution)

It depends on the situation and the effects on the photo you wish to create.

There is this thing call f-stop. Shutter speed, aperture and ISO are divided into stops. Increasing/decreasing in one parameter can be compensated with increasing/decreasing the other parameters.

For example, if you want to increase your shutter speed by 1 stop from say 125 to 250, you can compensate by opening your aperture by 1 stop say from f/11 to f/8 or increase the ISO by 1 stop say from ISO100 to ISO200.


BC

 

[Qingkai]

Hey if i am not wrong quote me if i am. well iso comes in 100 200 400 800 1600 3200 and maybe some levels in between. in general, every step in between results an increase in 1 F stop one 1 EV. that will allow you to have flexible play with your shutter and appature values by using iso. And of course allows you to shoot in the dark.

Personally i am using a D70. Relatively noiseless up to iso800. DNR mode removes most of the noise effectively too...

Hope that helps

 

[XiaoMiaoWang]

You need high ISO, no flash, get Canon. No Olympus. 4/3>smaller sensor>more noise.

 

[oinkoinkpig]

more dumb things to ask... if usually the max iso we need is abt 800 (est) hw cme the available is up to 3200? isnt it too much?

 

[elfvin]

more dumb things to ask... if usually the max iso we need is abt 800 (est) hw cme the available is up to 3200? isnt it too much?

sometimes light calls for the worst. you have no choice. btw, there's no max iso for a person.

nowadays dSLR noise control is pretty good! you won't get very very very bad even at 3200. and as the others say, noise is a kind of effect.

 

[oinkoinkpig]

hmmm i beta try some before and after pics...

 

[rodel]

to increase sensor's sensitivity in low light situations. just like in the old days when we use high speed film

Best answer!

 

[rodel]

It all boils down to light...

There are 3 inter-related parameters:

1. Aperture
2. Shutter speed
3. Sensitivity

To create an image, you need the right among of light. You vary each one of the 3 parameters to get the image you need or to circumvent the limitations.

For example, in a low light situation, you to get the appropriate amount of light to create an image, you can:

1. Use flash

2. Use a fast lens (lens with large aperture, e.g.f/1.4, 1.8 or 2.8, some of these lens are heavy and expensive, especially zooms and telephotos)

3. Use a slow shutter speed (probably need a tripod to prevent camera shake, not suitable for moving subject)

4. Use higher ISO (high ISO tends to exhibit more noise and have lower resolution)

It depends on the situation and the effects on the photo you wish to create.

There is this thing call f-stop. Shutter speed, aperture and ISO are divided into stops. Increasing/decreasing in one parameter can be compensated with increasing/decreasing the other parameters.

For example, if you want to increase your shutter speed by 1 stop from say 125 to 250, you can compensate by opening your aperture by 1 stop say from f/11 to f/8 or increase the ISO by 1 stop say from ISO100 to ISO200.


BC

Another best answer!

 

[bernardy4416]

but then in film it will not produce noise rite??? i dun noe cos i skip that generation

Like the others have said, high ISO film produces "grain" when printed. The effect is much like looking at newspaper pictures under a magnifying glass....you can see the "dots" making up the picture.

In the film days, we used hih ISO film to create special effects. Personally, I've used it on occasion and love the effects produced. If you happen to go to Venice, it's a good choice The trouble is it's really difficult to find film above ISO 400 unless you go to a specialist photo shop. I guess it's even harder now that digital has taken over most of photography.... IIRC, I had to go to a shop located in a small alley in a rather disreputable part of town when I was in Europe to pick up a roll of ISO 3000+ film :bsmilie:

Anyways, your problems are solved with a twirl of your command dial nowaways. Just change the ISO setting on your camera. However, there are some that claim that noise generated by PhotoShop is inferior to actual grain captured on film.

YMMV.



Bernard

 

[lsisaxon]

Like the others have said, high ISO film produces "grain" when printed. The effect is much like looking at newspaper pictures under a magnifying glass....you can see the "dots" making up the picture.

In the film days, we used hih ISO film to create special effects. Personally, I've used it on occasion and love the effects produced. If you happen to go to Venice, it's a good choice The trouble is it's really difficult to find film above ISO 400 unless you go to a specialist photo shop. I guess it's even harder now that digital has taken over most of photography.... IIRC, I had to go to a shop located in a small alley in a rather disreputable part of town when I was in Europe to pick up a roll of ISO 3000+ film :bsmilie:

Anyways, your problems are solved with a twirl of your command dial nowaways. Just change the ISO setting on your camera. However, there are some that claim that noise generated by PhotoShop is inferior to actual grain captured on film.

YMMV.



Bernard

It's not inferior, it's just different. Not random enough. Or random in space but not random in size/granularity.

 

[bernardy4416]

It's not inferior, it's just different. Not random enough. Or random in space but not random in size/granularity.

Hmmm, wouldn't a simple add-on program to PS solve that?



Bernard

 

[lsisaxon]

Hmmm, wouldn't a simple add-on program to PS solve that?



Bernard

To some people, it's still different. ;p