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Thank you for a very informative reply, Ben. very much appreciated!!
By the way I did use f19 and f22 and they were very similar and the best of the bunch (I took about 100 shots on different settings).
Miserere, I should have probably used higher ISO and faster shutter speed, right?
I will try again during the first half as suggested and see if I can get better results with a teleconverter then.
georgeweb, the teleconverter is Pentax 1.7x current model.
You got much better shots, Illigan and Mike! But I guess this is a prime lens, faster and with longer focal range, so that probably explains this. Do you get much less detail without the teleconverter?
One thing I am still not sure with the TC is the shake reduction. It asks to set the focal length, what focal lens should I set??
Georg, I think it is working quite well with Tamron 90mm macro, providing extra magnification and not losing much sharpness, but once I do some comparisons I can post them in another thread.
Piotro, you have quite a bit more detail - very nice! I am wondering whether this is due to you using 1.5 teleconverter (which brand? - sigma?) or that K20 is resolving more detail or better processing (from raw)?
Thank you for everyone's help - it's been very informative!