Refer to my more pedantic answer. 'Pushing it' in PP isn't really changing the ISO, since ISO is a guide to setting exposure.
Given a lot of surrounding explanation, the triangle might engender fewer conceptual errors, but I've never seen a version of the triangle which includes the explanation that you gave above.
June 6, 2023
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Changing ISO doesn't necessarily change the amount of light that hits the sensor. Aim your camera at a scene. Set ISO to 100, shutter to 1/100th, f-stop to 8, and don't change the scene lighting. Now change the ISO to 200. The same amount of light hits the sensor.
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Sensors clip hard. Changing the mis-named "Exposure" control in Lr introduces a shoulder, kinda like film. In some cases, increasing ISO can result in a decrease in read noise, especially in dual conversion gain cameras. Did you read the Lensrentals blog posts that I linked to above?
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That depends. ISO only defines the relationship between exposure and lightness for in-camera processing. So, it's not strictly correct to say that changing the lightness in out-of-camera processing is changing the ISO - it's just processing as you want.
The ISO control itself likely has a number of un-mandated side effects, designed by the manufacturer to optimise for the expected exposure at that ISO setting. Being un-mandated these are completely unstandardised and left to the design of the individual camera. As a rule they are designed to maximise saturation capacity at low ISO settings and minimise electronic noise at high ISO settings. But if you know your camera well you might find a better combination of exposure and ISO setting than the 'default' ones - assuming that you do the processing out of camera (or change the defaults for in-camera processing). -
The shutter speed and aperture (and the brightness of the scene) determine the amount of light hitting the sensor -- i.e. the exposure. Changing the ISO number, if you are in A, S or P mode, will put a bias on the metering.
Don
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Another way to "push" is to make the monitor brighter.
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Excellent! My monitor is set to put out 80 cd/m^2 in my dim room, so I could crank it back up to 300 and get a 'push' of 1.9 EV.
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User adaptation will reduce that.
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exactlly. and you cant push a raw image 5 stops without image degrading consequences.
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of cause it does in a very efficent visual sense. just imagine the 4 or 5 of you still cant come up with a better visual concept.
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and the same amount of radio signal hits your head as well but you cant hear the song playing 😵💫🤨 or maybe you can 👽👽
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wife : dear why are you weraing your sunglasses looking at your images !
husband: im playing with my new new pair of ND filters 🤣🤣 -
And what do you think ISO + 5 stops does other than push?
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A push with less image degrading consequences?
E.g. dual ISO.
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Still a push.
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Often, pushing in post yields better IQ than cranking up the ISO.
