For shutter speed, what does it mean for the pixels to integrate light? Does that means to compute how much irradiance is at a particular pixel?
cornrow-kenny
Yes. The way I interpret "integrate light" is that each pixel on a sensor is trying to measure the irradiance at that point. Irradiance is power over area, and power itself is work over time, so changing the shutter speed is changing the interval of time we're using to estimate the power.
EmmmaTao
I think that f-stop is also the contributing factor of the "starlight effect" when photographing a point light like a street lamp at night. Smaller the aperture, the more pointed the spikes of the starburst is, and the shape of the star is determined by the shape of the aperture diaphragm
Here is a detailed link explaining aperture diffraction
https://www.slrlounge.com/diffraction-aperture-and-starburst-effects/
randyfan
The exposure determines how bright or dark the image is. Its value depends on the camera’s aperture iSO, and shutter speed. I like the analogy of exposure as rain falling in a bucket. The rate at which the rain drops fall in the bucket is uncontrollable. However, we can change the bucket that we use. Specifically, we can change its width (“aperture”), how long we leave it out in the rain (“shutter speed”), and the amount of rain we want to collect (“ISO”). Collecting too much rain = overexposed and collecting too little rain = underexposed. The key insight is that there are many different combinations of the variables that will allow us to collect the desired amount of rain. For example, if we increase the width + decrease the amount of time we leave the bucket out in the rain, this change could be made equivalent to decrease the width + increase the amount of time we leave the bucket out in the rain.
john-b-yang
@randyfan Not sure if you got your explanation from this link (https://bit.ly/2vljV5k) but just wanted to give credit where it's due. The above analogy is fully described at the link.
For shutter speed, what does it mean for the pixels to integrate light? Does that means to compute how much irradiance is at a particular pixel?
Yes. The way I interpret "integrate light" is that each pixel on a sensor is trying to measure the irradiance at that point. Irradiance is power over area, and power itself is work over time, so changing the shutter speed is changing the interval of time we're using to estimate the power.
I think that f-stop is also the contributing factor of the "starlight effect" when photographing a point light like a street lamp at night. Smaller the aperture, the more pointed the spikes of the starburst is, and the shape of the star is determined by the shape of the aperture diaphragm Here is a detailed link explaining aperture diffraction https://www.slrlounge.com/diffraction-aperture-and-starburst-effects/
The exposure determines how bright or dark the image is. Its value depends on the camera’s aperture iSO, and shutter speed. I like the analogy of exposure as rain falling in a bucket. The rate at which the rain drops fall in the bucket is uncontrollable. However, we can change the bucket that we use. Specifically, we can change its width (“aperture”), how long we leave it out in the rain (“shutter speed”), and the amount of rain we want to collect (“ISO”). Collecting too much rain = overexposed and collecting too little rain = underexposed. The key insight is that there are many different combinations of the variables that will allow us to collect the desired amount of rain. For example, if we increase the width + decrease the amount of time we leave the bucket out in the rain, this change could be made equivalent to decrease the width + increase the amount of time we leave the bucket out in the rain.
@randyfan Not sure if you got your explanation from this link (https://bit.ly/2vljV5k) but just wanted to give credit where it's due. The above analogy is fully described at the link.