Fast lenses, and High ISO

Started Jul 18, 2014 | Discussions thread
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Chikoo
Chikoo Senior Member • Posts: 1,630
Fast lenses, and High ISO

Fast lenses, as they are called allow for more light to hit the sensor and in turn allow for fast(er) shutter speeds. The F number provides a relative measure of how much this ability is.

In this age of ever increasing ISO, are fast lenses needed anymore? The only ability I see the fast lenses provide was actually a disadvantage that happened to become a feature, and that is shallow DoF, allowing for separation of subject from the background.

That said, should they be called Fast Lenses or Shallow Lenses?

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tko
tko
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