Does ISO Affect Landscape Image Quality
Apr 30, 2020 10:18:51 #
DirtFarmer wrote:
The results showed that between f/8 and f/16 there was not much difference. Beyond f/16 the sharpness started to fall off .
f/16 is the limit for film.
According to LENS DIFFRACTION & PHOTOGRAPHY it's a little different for digital because diffraction can happen between pixels.
Here is how they calculate it for 24MP but even 16MP it's diffraction limited before you get to f/16.
Apr 30, 2020 10:25:38 #
DirtFarmer wrote:
... As far as the title is concerned, "Does ISO Affect Landscape Image Quality"(?) the answer is yes because increased ISO leads to increased noise. ....
In theory that's correct.
But if you can't see it it's not there.
In theory the Titanic was unsinkable.
So the answer has to be, "It depends."
Apr 30, 2020 10:32:44 #
selmslie wrote:
f/16 is the limit for film.
According to LENS DIFFRACTION & PHOTOGRAPHY it's a little different for digital because diffraction can happen between pixels.
Here is how they calculate it for 24MP but even 16MP it's diffraction limited before you get to f/16.
According to LENS DIFFRACTION & PHOTOGRAPHY it's a little different for digital because diffraction can happen between pixels.
Here is how they calculate it for 24MP but even 16MP it's diffraction limited before you get to f/16.
My post was a measurement, not a calculation. It was a measurement based on a limited sample and I hope to be able to increase the sample to get a better measurement. As soon as my wife goes back to work.
It was also done with only one camera (D800e, 36 MPx) and one lens (105 f/2.8 Micro).
Apr 30, 2020 11:49:28 #
ISO affects everything. In any situation is the lowest possible one. Put your camera on a tripod and practice and experiment.
Apr 30, 2020 12:01:04 #
selmslie wrote:
Significant? There is a little more but whether it's significant depends on how much you pixel peep.
It won't show up on a 13x19 print. That's what I see when I open the images in my 27" monitor using Windows Photo Viewer.
It won't show up on a 13x19 print. That's what I see when I open the images in my 27" monitor using Windows Photo Viewer.
I can see it on my 19inch monitor, the sky has a "grain" to it. It isn't enough for me to consider it a problem.
Apr 30, 2020 12:13:23 #
CatMarley wrote:
Yes, but only in extremes, because it affects othe... (show quote)
And, of course the noise at high ISO's which will vary with the camera, some of which control the noise very well at fairly high ISO's. The best results are always found using the lowest ISO at which you are able to use the aperture and shutter speed which will accomplish your artistic objective.
Apr 30, 2020 13:08:11 #
I cannot see much difference on the web shots, I expect it more visible on your monitor or printed? What about at 1:1 resolution, I would certainly expect to see more noise then.
Apr 30, 2020 13:09:35 #
zug55 wrote:
Look at the portions of your image that are in the... (show quote)
Also, if you denoise in post, you lose sharpness..
Apr 30, 2020 13:28:17 #
amfoto1
Loc: San Jose, Calif. USA
selmslie wrote:
And the raw files all look the same except for the ripples....
I don't know what you're seeing on your monitor, but when I compare your ISO 100 shot and ISO 6400 shot side-by-side at the highest magnification possible on UHH, on my monitor the ISO 100 shot appears sharper with a tad more fine detail and a little better "micro" contrast. Actually, the difference isn't great and the higher ISO image is quite good... very usable and much better than ISO 6400 images from cameras just a few years ago. But the ISO 100 image is even better.
Rather than looking at the images, compare the file sizes of the images. When the subject is identical (there may be too much variation in a scene like this) I think you'll find that the higher the ISO, the smaller the file. That's due to loss of dynamic range as ISO increases, as well as some reduction in resolution.
Apr 30, 2020 13:31:49 #
PHRubin wrote:
I can see it on my 19inch monitor, the sky has a "grain" to it. It isn't enough for me to consider it a problem.
I'm so accustomed to seeing grain in the sky in film that I wasn't even looking there for noise.
Could we be looking at at a dirty sensor? There are some spots that are easy to see at 100% but I have to go to 400% to observe what you are seeing.
If it increases with higher ISO then it's another case for keeping the ISO low.
Apr 30, 2020 13:53:20 #
amfoto1 wrote:
I don't know what you're seeing on your monitor, but when I compare your ISO 100 shot and ISO 6400 shot side-by-side at the highest magnification possible on UHH, on my monitor the ISO 100 shot appears sharper with a tad more fine detail and a little better "micro" contrast. Actually, the difference isn't great and the higher ISO image is quite good... very usable and much better than ISO 6400 images from cameras just a few years ago. But the ISO 100 image is even better.
I noticed that the UHH image on my monitor is about 20% larger than the Windows Photo Viewer image at 100%. Not a huge difference but if you only look at them with the same display method you can do a valid comparison.
amfoto1 wrote:
Rather than looking at the images, compare the file sizes of the images. When the subject is identical (there may be too much variation in a scene like this) I think you'll find that the higher the ISO, the smaller the file. That's due to loss of dynamic range as ISO increases, as well as some reduction in resolution.
Good point.
The B&W JPEG SOOC sizes are 6.9, 7.48, 7.96 and 8.49 megabytes respectively with each jump in ISO from 100 through 6400. The difference must be some form of noise. But the color versions of the same images saved by Capture One are 17.8, 18.7, 18.2 and 17.6 megabytes respecively.
Apr 30, 2020 14:01:22 #
mstracke wrote:
I cannot see much difference on the web shots, I expect it more visible on your monitor or printed? What about at 1:1 resolution, I would certainly expect to see more noise then.
The biggest image I can print is 13x19 and that works out to about 260 dpi. Rather than waste ink and paper I just display it on my screen 19" wide.
No matter how close I get to the screen, the only image that looks a little different is the ISO 6400 version at f/16.
Apr 30, 2020 14:04:30 #
BebuLamar wrote:
Significantly more noise in the ISO 6400 compared to the ISO 100.
Correct!
Apr 30, 2020 14:25:14 #
The higher the ISO the more noise will be introduced into the picture. The better cameras today have great sensors that mitigate noise from high ISO's to a degree. However, if you are shooting landscape, the best thing to do is to use a tripod so you can shoot at slower shutter speeds to allow the lowest ISO possible.
Apr 30, 2020 14:27:28 #
selmslie wrote:
I'm so accustomed to seeing grain in the sky in film that I wasn't even looking there for noise.
Could we be looking at at a dirty sensor?...
Could we be looking at at a dirty sensor?...
Looked at the sky and only saw 2 sensor spots, both fairly small impact.
Again, using the ISO 6400 since it was at f/16.
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