Fast lenses, and High ISO

Started Jul 18, 2014 | Discussions thread
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Great Bustard Forum Pro • Posts: 33,065
You forgot something.

EinsteinsGhost wrote:

Great Bustard wrote:

EinsteinsGhost wrote:

You're wrong about that, unless you mean that it is also wrongly used for DOF based arguments. Fast is about speed (faster the lens, shorter the exposure time for identical conditions).

What shutter speed can you use on mFT at f/2 that you cannot use on FF at f/4?

Obviously, you didn't try to understand the point made. Let me make it simpler:

Scene brightness: 9 EV

ISO: 100

With these conditions, f/2 will have a faster shutter speed of about 1/4000s. An aperture of f/4 will give you 1/2000s. A larger or smaller sensor will not change that.

Obviously, you do not understand ISO. Why would a FF photographer feel compelled to shoot the same ISO as the mFT photographer?

Please tell us about the exposure differences here as they relate to the visual properties of the photo:

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

Same exposure on first and second (f/2, 1/100s, ISO 400). Lower exposure in third by two stops.

That is correct!  However, you forgot to tell us how this relates to the visual properties of the photo.

Post (hide subjects) Posted by
tko
tko
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