Thanks, finally I am a "Pentaxian" (
Veteran Member)!
Quote: please link full image so that we can look in detail
The three JPGs are about 17MB each.
Is it possible to upload such images here?
Nevertheless, the three depicted areas are representative.
As the overview shows, the false colors really can ruin a complete picture - or generate modern art.
Quote: I think it's very good for testing lens too. I want some prints like these. How do I get some?
There are probably better ways to test a lens.
However, one can use lens test charts from the internet to determine critical lp/mm parameters, where problems should occur.
After such a procedure I used suitable patterns as a stamp.
Note that useful prints for this "Color Moiré Art" depend on your setup.
I had something like this from
my Ricoh GR test.
Thus, I used a similar focal length here.
Quote: but I can't spot any sharpness drop. The cropped text looks equally readable regardless of the setting. I wonder if a different lens, perhaps an ultrasharp macro, would show a sharpness difference between AA settings.
I am not really keen on trying that out.
The FA 20-35 @ 20mm & f7.1 should also be a quite solid performer in the image centre:
Photozone:
Lab Test,
MTF
In fact, the occurence of these artefacts shows that the lens is decently sharp.
A softer lens would act as an additional "AA" filter.
My point here was that it is quite easy to provoke moiré.
Often, it is stated that it can easily be removed.
Anyone is invited to try this out with the pictures above.