mjm6 wrote: DavidBM wrote: mjm6 wrote: DavidBM wrote: mjm6 wrote: Fred Miranda wrote: Daran wrote: httivals wrote:
The A7RIV should have less moire, correct? Given the greater resolution, shouldn't this result in less moire?
Only if your lens is soft.
With a high performance lens, I thought that higher sensor resolution = less moire.
With a soft lens, it should not matter as much as moire is masked just like when using a low pass filter.
Just a point of clarification. Higher resolution sensor does not equal less moire unless the sampling is exceeding the lens performance (which is likely in the corners, for example).
What happens with a high resolution lens and sensor is the moire will be pushed down into smaller portions of the image where it may become irrelevant. For example, instead of seeing it in bricks that are 100 feet away, it will be in bricks 200 feet away, or instead of seeing it in cordura fabric, it will be in silk.
If the lens is still exceeding the sensor, there will be the possibility for moire, but the size of the moire pattern will become smaller and less significant both on likely image size (proportion) and in terms of the level of detail you have to look at in a normal scene to see it.
Blow up the images so that the pixels are the same size, and if the image has the pattern to produce moire, it will still be there (as long as the lens can out resolve the sensor).
Sure.
But if you are comparing whole images at fixed print sizes or screen sizes, the image with higher capture MP will usually have less visible moiré, and never more visible moiré.
It is entirely dependent on the reproduction size of the image and for many people, higher MP means larger prints.
With 10 MP, would you do a 20x30 image from 35mm? Now, people are doing that regularly because they have the MP to support 360ppi on a print of that size.
Once you do that (run up the image to 360ppi or something similar), you will find the same amount of moire, but it will be at a different scale in the image because the image is reproduced larger.
This is what I meant about the moire being driven down into the details of the image with high MP.
If you take a 24MP image and a 62MP image and print them both at the same size, the moire in the 62MP image will be smaller scale and may become mostly invisible (or completely invisible) at that reproduction ratio, but it isn't less in the source file. The potential for moire remains exactly the same as long as the lens renders more than the sampling frequency of the sensor.
The caveat here is that the wells don't change in terms of cross-talk or other noise factors that will change the actual ability of the sensor to accurately collect the color information. That could very well happen as the sensors get more densly packed.
That’s what I said! Viewing the whole image at a fixed print or screen size (from the same distance) there will be less moirč visible in the higher capture res file. Of course if you compare at 1:1 this may not be so, because 1:1 with a higher res file is effectively greater magnification. But what matters is the final image - and for an intended final image viewing size choosing a higher res sensor will give you less moirč than a lower res one, with no extra perceived softness such as you might get by using a moirč tool or a low pass filter.
That's what I said...
However, you are dismissing the actual moire potential in the file with the practical moire in a final reproduced image (digital or on paper). They are different things, and that was my point.
We really (I think) don’t disagree! Of course there’s pixel level moirč as that’s the the effective frequency of the pixel level is where the moirč occurs. I don’t know what “dismissing the moirč potential” means. If it means denying the moirč at the pixel level I’m certainly not - that’s why I was careful to specify fixed print or screen sizes. If it means realising that for photographic purposes there are significant improvements in the moirč of finished images holding print or screen size fixed to be had by using higher resolution sensors then I am.
Sep 01, 2019 at 03:33 AM
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