Confused... i think

[tevo]

so the exposure triangle is ISO, shutter speed, and aperture


on a DSLR, the two settings you control in M would be aperture and ISO, and yet the "ISO" setting also controls the shutter speed


explanation? layman's terms please.. if you can manage !

 

[MTVision]

so the exposure triangle is ISO, shutter speed, and aperture


on a DSLR, the two settings you control in M would be aperture and ISO, and yet the "ISO" setting also controls the shutter speed


explanation? layman's terms please.. if you can manage !

In Manual you control aperture, shutter speed, and ISO. You set the ISO to like 200 then set the aperture where you want it then adjust the shutter speed until a correct exposure shows. The ISO doesn't "control" the shutter speed - you do.

 

[Josh66]

ISO and shutter speed are independent of each other. ISO doesn't "control" the shutter speed, although it may necessitate using a different shutter speed (or aperture).

The two settings you control in manual mode are aperture and shutter speed. ISO can be changed in any mode.

 

[tevo]

so the exposure triangle is ISO, shutter speed, and aperture


on a DSLR, the two settings you control in M would be aperture and ISO, and yet the "ISO" setting also controls the shutter speed


explanation? layman's terms please.. if you can manage !

In Manual you control aperture, shutter speed, and ISO. You set the ISO to like 200 then set the aperture where you want it then adjust the shutter speed until a correct exposure shows. The ISO doesn't "control" the shutter speed - you do.

so one value is the aperture. i understand that. then i turn the control dial to set my shutter speed, but is that also ISO? there are only 2 means of altering 3 settings on my camera - that is why i am confused

 

[Trever1t]

I set ISO depending on lighting conditions but as low as I can get away with. Then I set my Shutter speed or Aperture depending on desired DOF or effect (like stopping motion or long exposure) and then the other for balanced exposure.


ISO has a separate control. Either push a button AND spin a dial OR go into the camera's menu.

 

[tevo]

OHHHHHHHHHHHHHHHHADSGJALK;IOKLJKALJOIAJSDAG i see now. so how does the iso impact the picture? i had mine at 100

 

[Josh66]

but is that also ISO?

Shutter speed and ISO are totally different.

Shutter speed is how long the shutter curtains are open. ISO is how sensitive the sensor is.



What camera are you using?

 

[tevo]

but is that also ISO?

Shutter speed and ISO are totally different.

Shutter speed is how long the shutter curtains are open. ISO is how sensitive the sensor is.



What camera are you using?

Nikon D7000... this is brain gap #2 that has been patched in the last day or so. I always thought I was changing the ISO when I was just changing the shutter... never even touched my ISO. Time to keep reading understanding exposure!

But, why would I want to have a higher ISO vs a lower one? And can I relate this to film photography as well?

 

[MTVision]

Higher ISO allows you to take pictures in low light situations but can create noise (grain) in the pictures.

ISO in film photography was film speed, I think.

 

[tevo]

Higher ISO allows you to take pictures in low light situations but can create noise (grain) in the pictures.

ISO in film photography was film speed, I think.

I have learned so much in the last 2 days thanks to this forum. Worth the 25 bucks!

it makes SO MUCH SENSE !

 

[480sparky39 38]

.............ISO in film photography was film speed, I think.

It is also ISO in film speed.

Unless you have a Delorean that can do 88 mph... if you go back to the 80's, it was ASA.

 

[tevo]

.............ISO in film photography was film speed, I think.

It is also ISO in film speed.

Unless you have a Delorean that can do 88 mph... if you go back to the 80's, it was ASA.

My Nikon FM looks like it has a setting for "ASA", with values of 50, 100, 200, and has no clear way to adjust it. I know it pertains to the film speed, but any insight on how I would go about changing it? The film I have in there right now is 100, so it doesn't really matter too much.. am just wondering.

 

[Trever1t]

if, and I repeat, IF you are unable to achieve a balanced exposure at your desired speed or aperture, bump up the ISO until you can. Don't forget to put it back to your camera's native ISO.

 

[480sparky39 38]

My Nikon FM looks like it has a setting for "ASA", with values of 50, 100, 200, and has no clear way to adjust it. I know it pertains to the film speed, but any insight on how I would go about changing it? The film I have in there right now is 100, so it doesn't really matter too much.. am just wondering.

Back in the heyday of that camera, ASA 400 was pretty much the top limit of films speeds. If you use a higher ISO film today, you'll need to manually adjust the exposure if 200 is the top limit on the camera.

For instance, if you dial in ASA 200 and you have ISO 800 film and the meter says f/8 at 1/125, you can either adjust the aperture to f/16, the shutter to 1/500, or split the difference and go f/11 at 1/250.

 

[Josh66]

And can I relate this to film photography as well?

It's pretty much exactly the same with film, except that with film you're pretty much going to shoot the whole roll at the same ISO - you're not (normally) going to be changing it from shot to shot. Films have different ISOs (100 or 400 for example), and you're generally going to want to set the camera to match that.

There are, however, times when you will want to use a different ISO than what the film says it is. Sometimes you might want/need to push/pull film - would would have to process differently in that case. Sometimes films 'look better' a stop or so overexposed - you would process normally in this case. And changing the ISO can also be used as a sort of exposure compensation.

My Nikon FM looks like it has a setting for "ASA", with values of 50, 100, 200, and has no clear way to adjust it.

There is definitely a way to adjust it...
Does the dial turn or anything? I'm not familiar with that camera, but changing the ISO (or ASA) is something that would have been done on a regular basis, so it can't be that hard.