what to buy? and how to use canon 550Ex on Pentax 645?

[cmc_photo]

Pls tell me what to buy and how to use Canon 550Ex flash on pentax 645? Thanks

[ukexpat]

Pls tell me what to buy and how to use Canon 550Ex flash on pentax 645? Thanks

You can use it as a completely manual flash, but I don't think you will be able to get the automatic functions to work -- unless the Pentax uses the same flash system as Canon. The 550EX is designed to work in auto mode only with compatible Canon cameras...