Viltrox 23mm 1.4 - About optical limits review (not just reading the final rating)

Started 3 months ago | Discussions thread
OP Rmcp20 Senior Member • Posts: 1,278
Re: Viltrox 23mm 1.4 - About optical limits review (not just reading the final rating)

Atsel wrote:

Rmcp20 wrote:

Atsel wrote:

OP compares resolution numbers. Its meaningless except in cases when Fujinons are better despite lower resolution sensors used.

My point is very clear.

People were bashing the Viltrox because it was rated 3.5 , so lower than the Fujis.

My point was to show that what the graphics/tables show its that all lenses were better in some aspects. Still, even tested in a more demanding sensor the Viltrox achieved better center sharpness and less vigneting (much less actually).

And the diference in numbers from the corner sharpness table would be as big as it is now.

https://www.instagram.com/rui_porfirio/

"More demanding sensor" makes resolution numbers higher. So of course Viltrox has higher numbers in some cases. In the same time you show that Fujinons still have higher numbers in other cases despite lower resolution sensor which is pretty remarkable.

I was thinking it would affect the oposite way, so i tried to ready about it.

Line Widths or Pairs per Picture Height (LW/PH or LP/PH)

The above is what Optical Limits use.

When searching about how pixel density/size can affect measurements, i found this:

"Resolution is measured using edges, Siemens stars or other regular structures with íncreasing frequencies. Units like LW/PH, LP/PH, or Cycles per pixel are independent of the sensor size and the pixel pitch.

They just take the resulting image and its frequency content into account not caring about the size of each pixel. Dimensions like LP/mm, L/mm, or Cycles/mm require the knowledge about the sensor size / pixel pitch."

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LP/PH

"If you only express the resolution in LP/pix, you do not take into account that the sampling itself will reduce the resolution. So if you have camera A with 0.5 LP/pix and camera B with 0.4 LP/pix you would say that A is better than B. But if camera A has only 320 pixel in height and camera A has 2000 pixel, camera B will definitely show more details in the same scene. So to make the test results comparable with the efficiency (LP/pix) and the amount of pixel combined, express the resolution as line pairs per picture height. In this example, this would result in a comparison of 160 LP/PH to 800 LP/PH.

So it looks like unlike what optical limits said, pixel size is not important.

Source: https://www.image-engineering.de/library/technotes/761-resolution-measurement-and-its-units

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