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What is the guide number of a smartphone "flash"?

For a continuous light, "guide number" is variable based on the duration of the shutter. The longer the shutter stays open while a continuous light is turned on, the brighter the image will ...
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What is the guide number of a smartphone "flash"?

The guide number of a flash is determined as the F-number multiplied by the distance that gives a proper exposure. The guide number is different for different ISO sensitivities, but they are typically ...
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Can I use my Samsung A51 smartphone camera to look at the red/near-infrared region?

-I assume near-infrared pixels will be labeled in most software as 'red'. Would there be any app which enables me to separate (even false-color differently) shorter-wavelength red from longer-...
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Can I use my Samsung A51 smartphone camera to look at the red/near-infrared region?

A possibility: Most likely the red pixels will pick both short-wavelength red, long-wavelength red and maybe some near infrared. If your subject is stationary, you could place a filter in front of the ...
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Can I use my Samsung A51 smartphone camera to look at the red/near-infrared region?

Sensor in regular cameras and smartphones have sensels with either red, green or blue filters in front of them that measure the light that passed through the filter. So they cannot distinguish ...
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