Long story short - I had ordered a ball head from Hong Kong via eBay for use on my monopod. Communication problems and shipping delays meant that it didn't get here before my trip to Costa Rica. I bought this one as an alternative. I have since received the original which has a Arca-mount on the top, more suitable for my use. So this one goes . . .
Works fine, held the weight of a K20D + battery grip + DA* 50-135 without slipping. Standard female thread on the bottom to mate with monopod or tripod, standard 1/4 x 20 on the top to attach to your camera. Single screw clamp to hold the ball in place (no separate adjustment for rotation or for degree of friction as you will find on more sophisticated (i.e. expensive) heads. $25 including shipping within the U.S. Contact me off-list if interested stan -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.

