Fast lenses, and High ISO

Started Jul 18, 2014 | Discussions thread
Great Bustard Forum Pro • Posts: 42,222
Re: Fast lenses, and High ISO

bobn2 wrote:

Great Bustard wrote:

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.

In the end, if we want better performance, we have to adopt the one that human vision does, tons of signal processing. The eye is not ever so efficient as a photon collector, its lens isn't very fast and we aren't equipped with flash (well, not that kind of flash). Our vision is as good as it is because our built in processing takes these poor quality raws and uses prior experience of what things should look like to reconstruct good images from them.

The brain's processing goes into overboard when you're drunk, though -- what you wake up next to often looks very different than what you went home with. 

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