Yoshizen's Blog

Hi-ISO noise

Fragmented lens on Nikon Z7 / ISO 25600 / ND filter = in order to make the exposure time even longer, a dark ND filter was used as well.

Till now, I thought that the noise caused by Hi-ISO setting was just a nuisance, or necessary evil though, I became aware, in certain case, it could be an useful tool.

(ISO represent the degree of amplification of the signal —– any electronic signal would produce the noise when it was intensively amplified = whether it was audio signal, or light signal from the image sensor, when they were amplified, the residual charge in the circuit line etc etc were also amplified hence those noise was superimposed onto the main signal. — you may say why the digital signal has noise = the output signal of image sensor IS analog, until they were AD converted. = Here, in the AD converter, the depth of 12 or 14 bit etc decide the quality of the image. = one bit more mean twice as much process will be needed for each pixel of the image sensor ! = You see how enormous the task is = That’s why almost all digital camera is Japanese (inside of Leica is Panasonic) and almost all image sensor is Sony —– Who else would bother to take such awkward task in the world. 😀 )

Fragmented lens / ISO 25600 / ND filter
Fragmented lens / ISO 25600 / ND filter
Fragmented lens / ISO 25600 / ND filter
Fragmented lens / ISO 25600 / ND filter
W 1/2-B lens / ISO 25600 / ND filter
For a comparison, this photo was taken under the same condition but with the Sony A7R / Fragmented lens / ISO 25600 / ND filter (noise level seemed to be a bit less than the Nikon Z7 —– was that what the advantage to be an electronic company over a lens company ? )

Even among the oil paint, many different styles = so, in the soft paintery effect photography, there could be a grainy style —– looks not too bad.


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