Best low light FF Canon DSLR

Started 3 months ago | Discussions thread
Dr_Jon Veteran Member • Posts: 6,080
Re: Collect...

J A C S wrote:

Dr_Jon wrote:

Mako2011 wrote:

Dr_Jon wrote:

Mako2011 wrote:

Dr_Jon wrote:

...or ETTR, but whatever you do if you halve the ISO you'll be able to collect more light (as the usable sensor saturation will increase).

No because as you stated before ...."ISO doesn't change the amount of light the sensor collects".

The ISO amplifier is part of the sensor,

It does not affect how much light the sensor collects

Side note...Exposure is the amount of light per unit area (the image plane illuminance times the exposure time) reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance. Nether ISO nor amplifiers affect the amount of light per unit area reaching the image sensor.

Indeed not, but they sure affect the amount of sampled light reaching the ADCs... which is what matters in this case.

But it (higher ISO) makes more light on the bottom of the tonal range useable.

This is also true, although I was just trying to make a simple point to help the OP with the answer to their question, and it has spiralled a teeny bit...

Plus the light at the bottom of the range can also be better used if you can use a faster lens to take the shot with an extra stop of light and one less stop of ISO, which was part of my point a few hundred posts ago
(Along with some guff about being okay with the reduced DoF.)

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