How many of the 7D 8 frames will flash with 580 EX II & Ext Battery?

Started 7 months ago | Questions thread
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How many of the 7D 8 frames will flash with 580 EX II & Ext Battery?
7 months ago

Hello all.

I am trying to wait for the Photokina announcements before buying any more gear. I do not have a 7D and my best flash is the 430 EX II. I like using HSS in daylight for hummers. And with the IMEDION batteries (Maha POWEREX manufacturers in slow drain high power version) I get more than the every other shot I was getting with the Eneloop. But still usually only a few in a row at best. And that is at the snails pace of my EOS-M.

I am considering buying a used 580EX II and external battery pack for the 7D II or 70D or 7D I, if the 7D II fails to happen and could use it with my M until then.

Could one or more of you knowledgeable folks tell me how many flashes would I get out of a 2 second burst? 600RT-EX experience also welcome?

 bugbait's gear list:bugbait's gear list
Canon EOS M Canon EF 300mm f/4.0L IS USM Canon EF-M 22mm f/2 STM Canon EF-S 55-250mm f/4-5.6 IS STM +1 more
Canon EOS 70D Canon EOS 7D
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