Best low light FF Canon DSLR

Started 3 months ago | Discussions thread
Dr_Jon Veteran Member • Posts: 6,075
Re: Not really...

Mako2011 wrote:

Dr_Jon wrote:

Mako2011 wrote:

And I pointed out ISO setting alone does not change how much light is collected...only scene luminance, shutter speed and aperture affect the amount of light collected

It's saying that for a "correct exposure" the camera (or you if you meter manually) will let in the same light if the ISO stays the same, regardless of lens, when you reduce the ISO it will let in more light (because it can use more of the sensor's capacity as less is clipped, although it's the same for film).

Not really as simply reducing the ISO setting doesn't mean the sensor will capture less/more light. That's most obvious when setting the "correct exposure" manually then changing the ISO. No matter the ISO setting...the sensor always captures the same amount of light/photons. As you stated earlier, "while ISO doesn't change the amount of light the sensor collects",... only by changing the shutter speed and/or aperture and or scene luminance is more/less light let in

I'm sorry, you do get there is such as a thing as a correct exposure (I am pretty certain)? That for a scene illuminance X and ISO Y there are Shutter Speed/Aperture pairs that provide  what is seen as a correct exposure (a particular amount of light to fall on the sensor)? And that as ISO reduces by a stop the amount of light for a correct exposure will double? You can do your own thing, although if you increase ISO without reducing the light you capture you'll lose the highlights.

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