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Addendum
Page 247
DSLR Firmware. Doing so could void the warranty and damage the camera. It is
better to leave specialized work to specialists.
Proposed Solution
I do not believe that Pentax has an AF checking chart available to the public. That is
the primary reason I took it upon myself to design one. After reading every blog and
information about the subject on the internet, after reading comments from the
readers of my blog site and threads on various forums, I deducted that one chart
could not do it all. Three charts were designed because the minimum focusing
distance varies from lens to lens. The smaller chart (Chart–1) works well for close-
up lenses and lenses that have macro capabilities. The medium sized chart, (Chart-2)
works well for normal lenses, say 30mm to 100mm, which have a minimum focus
distance needing a target a little bigger than Chart-1. The third chart (Chart-3) is for
lenses that cannot focus very close. One could keep enlarging the last chart, but I
believe that the three charts attached herein will be functional for the majority of
lenses.
Chart No. 1 Chart No.2 Chart No.3