Sony ISO AUTO Min SS

[Antonio Correia]

I have been trying to understand deeply (means in large practice) the ISO AUTO Min. SS
ISO limited to 8000 - Sony 135mm lens

[rpcrowe]

Antonio, that is excellent quality for ISO 8,000. Makes me glad that I have decided on an A7iii to pair up with my A6400 for a two camera duo...

For a guy who started in photography when ASA (forerunner to ISO but the same values) of 125 was considered super high speed film, today's cameras ISO capabilities simply blow my mind...

[Tom Barry]

I agree entirely, Richard. I remember Kodachrome 64 as being a great speed advance!

[dje]

Yes Antonio, it's very impressive indeed for ISO8000. What sort of noise reduction did you use?

Dave

[Antonio Correia]

Thank you guys for your lines.
I have limited in camera the ISO to 8.000 and I have been during this session trying the ISO AUTO Min SS.
For a 135mm the 1/40 is rather low but I managed to save a few pictures shooting continuously for a few seconds.
I have not applied any noise reduction. I think I had the right exposure, that's all.
I "have been" to Nik Collection for detail enhancement or similar. I just use a couple of their presets.
Herewith both histograms and the original photograph.

But I have another one which is also a good photograph. Perhaps a bit noisy...
This time, using the ISO AUTO Min SS the shutter speed was as low as 1/30 ! The compensation was set with the eye on the EVF

[DanK]

These are clean, but not surprisingly so, and it doesn't seem to me that they provide much information suggesting the Sony is much different from other modern cameras. At this low resolution, noise is hard to see unless it is very bad. To illustrate, I just took two shots at IS0 6400 using my Canon 5D III, which is a 7-year-old camera model. (It doesn't have ISO 8000, at least as I have it set up.) If you pixel peep at full size, you can see considerable noise in the shadows of the darker one (wooden man and CDs), but they look pretty clean here, even at the 2048 pixels across that you can see in the lyte box:





These were shot raw, hence no noise reduction in camera, and I did nothing to them in post but import them into Lightroom and change white balance. The noise would be much worse if I had not exposed to the right because the signal/noise ratio is bad in shadow areas at high ISOs.

This is a specific instance of a general issue I have posted about before: low-resolution images tell one very little about image quality unless the image quality is very poor.

[Antonio Correia]

They look quite good in screen.
Nice alabastro vase, Dan ! And pot ! Egypt ?

[DanK]

They look quite good in screen.
Nice alabastro vase, Dan ! And pot ! Egypt ?

They are all modern, but I no longer recall where any but the jug came from. The jug was made by a potter who lived in the Adirondack mountains. I think the vase was my mother's.

the photos badly need contrast and sharpening, but I posted them straight out of the camera to show the amount of noise.

[Antonio Correia]

Thank you Dan !

[Antonio Correia]

I stopped using this feature because I think I have “discovered” something which for at the moment, seems better.
And what is it ?
I customized the back dial to the ISO settings. So, as I use A most of the time I set the ISO so I get the speed I want or need.
I mean I rotate the dial and see in the EVF the speed, the aperture, the ISO, the compensation, and the histogram !
In Sony cameras that is possible because as I rotate the dial I can see the speed changing. This way I use the lower ISO I can for that instance.
Sometimes, I set the shutter delay for two seconds what allows me to shoot at lower speeds.
I think it works great but I have to confirm at home in the computer
Have I given a confusing explanation ? I suspect so... I will try again if necessary 😊

[Antonio Correia]

I found the same here https://fstoppers.com/originals/thre...cameras-354236
It has been done before and I did not know it !