How Critical is Lens Speed?

Started Feb 7, 2013 | Discussions thread
Peter Kwok
Peter Kwok Senior Member • Posts: 2,399
Re: How Critical is Lens Speed?

Here are some reasons for a fast lens:

  • You need fast shutter speed for sports
  • You need to shoot in dim lights with no tripod, IS, or at moving subjects.
  • You want the artistic effect of shallow depth of field for subject isolation or dreamy effects.
  • You want to showoff your ability to buy a f1.2L lens.

The difference between f1.4 and f2.8 is 4 times the light gathering ability.  It is critical if you need 4 times faster shutter speed or lower noise.  It also mean 4 times the weight and at least 4 times the price.

Personally, I do not care about shallow depth of field.  However, a whole generation of young women are impressed by it.  Therefore, f1.2 lens have become the bread and butter of wedding photography.

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Peter Kwok
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