A reminder for some memebers as to what the F stop is all about.

Started Jan 26, 2014 | Discussions thread
Dimitri_P Regular Member • Posts: 201
Re: A simple Yes or No.

Great Bustard wrote among other things:

We take a pic of the same scene from the same position at:

  • 50mm f/2 1/200 ISO 400 on 4/3
  • 100mm f/2 1/200 ISO 400 on FF
  • 100mm f/4 1/200 ISO 1600 on FF

and display the photos at the same size. Assuming the sensors are roughly the same efficiency, in what way will the photos be similar and in what way will they be different?

The one shot with the slow lens on FF will have more noise than the one shot with the faster lens and the 4/3  shot will have more noise than the FF shot at ISO 400.

Someone over here reading this must have a FF and 4/3 camera available to take three shots and post them...

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