As far as I can tell, these two lenses are focused on different objects.
I am comparing the add sheets with "tasracing.com.au" (or whatever it is),
as well as "800".
I am also looking at the lamps in the top left corner.
It looks like the main point in focus in the bottom one is somewhere near
the middle of the second hole.
I cannot find where the top photo's focus.
I suspect that it is why you are concluding about the lesser degree of
sharpness in the top photo. And you might be correct.
But to draw a reliable conclusion, one should focus on a distinct feature
in the photo (the same one for both lenses!), and I don't see that
happening here.
I think a test pattern for the depth of focus would be really helpful here
to unambiguously eliminate any user error. (I am talking about the
test pattern that is tilted.)
Igor
On 21 March 2017 at 04:08 Philip Northeast wrote:
https://flic.kr/p/T5fdc1
1/5 crop of same scene taken with Pentax #pentaxK1 body and 21st century
Zeiss planar T*f1.4 50mm at f8 and a mid 1970's Pentax M series 55mm
also at f8. The result may surprise.
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