On 29/01/08, mike wilson, discombobulated, unleashed: >AF280T. It has a screw-ring system to "lock" it to the camera. Except >it isn't really locked, just held by friction. As the friction is >created by a screw thread, there has to be a serious amount of >unscrewing to really loosen the flash. Modern systems tend to be a >quickthread lever type arrangement. The lever turns a thread of very >high pitch that moves in 1/4 turn what took 1.5 turns in old money. >Quicker on but also quicker off. One small bump of the lever and you >are fully undone, because the high pitch has much less friction than the >ordinary thread. Hence the locking pin, which does not withdraw until >the lever is fully moved to "open", usually requiring some extra force >to do so. Pretty much the same logic applies to bayonet versus >screwthread lens mounting.
Thanks Mike. never used the locking mech. I use a 580 EX a lot and never had an issue with locking it / unlocking (okay 'frictioning') but sometimes if I'm just grabbing a few shots I don't bother tightening up the ring. When you push the flash into the hotshoe, it very firmly 'clunks' into place. certainly doesn't fall out. HTH -- Cheers, Cotty ___/\__ || (O) | People, Places, Pastiche ||=====| http://www.cottysnaps.com _____________________________ -- 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.
