Fast lenses, and High ISO

Started Jul 18, 2014 | Discussions thread
ultimitsu Veteran Member • Posts: 6,650
Re: Fast lenses, and High ISO

Chikoo wrote:

ultimitsu wrote:

Chikoo wrote:

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.

how is it a disadvantage when you can stop the lens down?

The purpose of designing larger apertures was to get more light in. The shallow DoF is a side effect or a by product of doing so.

You did not answer the question.

A F/1.4 lens can stop down to at the least F/16, often F/32. That ability is not different to that of an F/5.6 lens. So I am asking you again, how is it a disadvantage when you can stop the lens down?

At best, you could argue one cannot always make use of the large aperture advantage, specifically, when deeper DOF is required. But that is not what you said.

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