Explain digital ISO

Hi folks!

A question here...

How does ISO on DSLR's differ from film SLR's? I understand the relationship with film cameras and the 'grain' you get from high speed film. Why does this matter on a digital camera? How does that electronic pickup screen operate differently when I tell it to act like 100 ISO vs. 3200 ISO? Is this just for creative exposure controls for your available lens shutter speed and F-stops? Or is there some physical characteristic?

Thanks ahead of time!

Jim

It's a fairly similar concept. As you raise the digital ISO you will decrease the dynamic range and get more electronic noise - which equates to grain.

It's a fairly similar concept. As you raise the digital ISO you will decrease the dynamic range and get more electronic noise - which equates to grain.

I thought it might be like that. I wasn't sure if there was some actual electronic degradation or not, or if it was just to accomodate your desired creative control.

Thanks,

Jim

I thought it might be like that. I wasn't sure if there was some actual electronic degradation or not, or if it was just to accomodate your desired creative control.

 

Thanks,

 

Jim

Well, typically they boarder on fantasy.