Fast lenses, and High ISO

Started 4 months ago | Discussions thread
Great Bustard
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Re: Fast lenses, and High ISO
In reply to Chikoo, 4 months ago

Chikoo wrote:

Great Bustard wrote:

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.

Indeed, they both go hand-in-hand. This is a cornerstone of Equivalence.

I am sure the designers would like to have more light in without larger apertures. If they could they would.

Aside from wider apertures, there's more efficient sensors, longer shutter speeds, and/or flash -- each has its limitations.

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