The most popular one of the lot is the Tamron 90mm. It can be used either AF or manual, gives a good working distance and is exceptionally sharp. You can find them on E Bay for about £150 - but make sure it is the Di version (Digital). The earlier ones were for film cameras and can reflect light backwards onto the sensor, giving an annoying purple blob in the middle! *IF you can find one, the Pentax-M f4, 100mm is a superb beast but it has to be used on M with the Green button for metering.
Alternatively, you can get a K-mount to M42 adapter so you can use the old m42 screw fit lenses. A good set of M42 extension tubes will cost about £6 and a Takumar 55mm lens about £15. Screw the rings onto the camera in varying combinations for different magnifications (and working distances) and screw the 55mm on the end. You will learn a great deal with such a set up because it's just you and the camera and its all manual.
Most macro lenses have the front element well recessed and often don't need a hood but if you use normal lenses (e.g. on tubes) a hood will be essential. I even put a hood on my macro lenses to exclude all unwanted stray light. The original Asahi 49mm job for 135mm lenses is ideal.

Absolutely cracking set. I particularly like the one 'in the water' right at the start and the steps up underneath the trees. (I don't like the thought of climbing them all!)

Sitting on my desk at present are the *istD, K5 and K3ii, all three of which are used regularly. I keep being tempted by a K1 now and then but I keep asking myself, "what do you want one of those for?" On the other hand, I could do with upgrading my working lenses but nearly every review you read talks about not if, but when the Self Destruct Motors will fail. Being on a fixed pension, I cannot justify blowing almost four figures on a near certain lemon - and the one I'd like can't be converted to screw drive without a complete rebuild!

Excellent set, especially the inverted ones with water droplets. You might like to try them against a clear blue sky too - it works.

PentaxForums maintains a complete list of everything Pentax has ever made with the facility to enter your own stuff with serial numbers, provenance, date and price paid etc. On the home page, look under Cameras, Lenses, Accessories and under each you will find "pentax serial number database". The rest is self explanatory. (You do have to be a subscriber of course!)

Surely, you need 1000 monkeys with 1000 typewriters for that one?

Do tell us more .........

Doesn't Phil Hemsley (morpheus) on here do such tuition?

That 18-55 kit lens gets a bad press. I like mine. (I like big lizzies too)

Bids usually pile in during the last 2 or 3 seconds so don't fret over it just yet.