What a great website that is.
Isn't it though.
One neat thing you can do is put the same lens for both
charts but at different f-stops, so you can see how
the lens improves as it's stopped down. The chart
even show how light falloff on the edges - sometimes
called "vignetting" - is improved from full wide-open by stopping
down a bit. A good example is the Canon 20mm 2.8, which
seems to have quite a heavy light falloff when wide
open:
http://the-digital-picture.com/...Comp=0&APIComp=2
If I set up the above link correctly you should see the Canon 20 at 2.8
and then the 20 stopped down to 4. Besides the lifting of the
light falloff, also notice the dramatic improvement
in center sharpness with just 1 stop down.
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"We'll always show up at the wedding with a gift bag for the bride. Inside we have these incredible fuzzy slippers in the teal of our branding."
