Fast lenses, and High ISO

Started Jul 18, 2014 | Discussions thread
MoreorLess Veteran Member • Posts: 4,428
Re: Fast lenses, and High ISO

Chikoo wrote:

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?

You could of course say that improved noise performance isn't merely at high ISO levels but all ISO levels, indeed in more recent years its actually base ISO that has improved most with greatly increased dynamic range.

So using a fast lens not only to control DOF but to have access to this improved performance is a reason for many using them.

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