there is a section of the forums dedicated to macro
you could also check out this thread which shows what some of us have been able to do, with or without a dedicated macro lens
Pollinators in action - Page 46 - PentaxForums.com
[ warning - it is not a short thread
]
I would recommend a dedicated macro lens capable of 1:1 but I admit that I am no expert in macro just a dabbler
Quote: The Advantages of a Dedicated Macro Lens
Achieving lift-size magnification
By PF Staff in Tutorial Videos on Apr 4, 2016
Read more at:
The Advantages of a Dedicated Macro Lens - Tutorial Videos | PentaxForums.com
a dedicated macro lens would be a good lens even if not used for macro
[ I have the D FA 100mm F2.8 Macro ( no WR )