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Is these JPEG artifacts?
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May 27, 2022 12:34:08   #
joecichjr Loc: Chicago S. Suburbs, Illinois, USA
 
azemon wrote:
It was a cloudy windy gusty day and I was mostly shooting birds, both in-flight and on the rapidly waving grass. I took a break on a bench next to my wife and saw those two trees. I grabbed the shot without bothering to reset my camera. Naturally, I don't normally shoot static subjects at ISO 4000 with a high shutter speed an small f-stop.

I was surprised to see the smeary artifacts when I got home and wondered where they came from. Ysarex correctly identified the source: the High ISO Noise Reduction processing in the camera. I did some experimenting and found that I can avoid that processing either by turning it off (doh) or by shooting raw.
It was a cloudy windy gusty day and I was mostly s... (show quote)


A fine capture of a real beauty 💙💙💎💙💙

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May 27, 2022 12:53:27   #
azemon Loc: Saint Charles, MO, USA
 
Thanks much :-) The weather forecast had been for sun so my wife and I picked that day for our outing. The weather didn't cooperate at all but I'm not one to leave my camera in the car just because the light isn't right. I figure that the day was a win: I got three shots that I like and I learned about the effects of the High ISO NR processing in my camera, which I don't like and have now turned off.

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May 27, 2022 13:25:46   #
Ysarex Loc: St. Louis
 
williejoha wrote:
The old rule. Shoot as close to the native ISO ( usually around 100 ) as possible to get maximum resolution.
WJH

williejoha wrote:
Paul, I am not sure he gets it. JMHO
WJH

Your old rule could use some modern qualification. ISO correlates with noise so that higher ISO images typically have more noise. Noise can reduce resolution however it has to be pretty severe before that becomes a real problem. So if the noise is slight to moderate resolution isn't going to suffer.

The OP has a modern 24 mp FF sensor camera. Given the ISO he used resolution loss to noise would be so slight that in no way could it explain or account for what he saw. Note the example below in which I used a similar 24 mp FF sensor camera and set the ISO to 6400. The noise increase at ISO 6400 is visible however resolution suffers barely if at all. The OP wanted to know what was causing the detail smearing he saw. It wasn't the result of noise due to the high ISO.



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Jun 7, 2022 14:52:32   #
Blenheim Orange Loc: Michigan
 
It does not look like noise caused by high ISO setting to me, nor JPEG artifacts, but more like some sort of smoothing caused by a setting in the camera. I had a similar issue with a Canon camera at one time. The camera was smoothing the images to eliminate noise. Ysarex is probably right about the noise reduction setting. In any case, that is an easy fix to try.

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