While I am new on these forums I have been on the Canon Rumors Forums for a few years now,
I really wanted to bring this too the attention of you and Canon as it is simply a highly important problem, those of you that don't know, the 5D3 suffers serious focus locking issues when a Canon speedite is attached in Low light, the AF assist beam causes lag with the AF from the 5D3, this makes it virtually impossible to achieve focus in low light when the speedlite is attached, I wanted to bring the topic to this forum, so I have pasted a link to all the discussion we have already had about this problem at Canon Rumors.com - see below
Please help in letting Canon know this is a very serious problem and effects the cameras performance in most working environments when a speedlite is attached and working in low light, conferences, nightclub work, weddings etc, and can stop the photographer completing the job or task.
yes thats true there are two distinct problems:
1. utilization of the AF-assist beam. to the extent that the real problem is AF low light performance then perhaps #2 below is also important in this context, but my point here is that this particular test condition is easy to reproduce with great consistency, and there appears to be a marked lack of performance utilzing specific flash models, i.e 600 ex rt and 580 ex ii.
2. re: FM forums and actual low light AF performance. Yes, there is more variation here (RustyTheGeek returned his first 5D3 and the replacement worked better), and the tests exposed to date are all over the map without specifying the EV level, for example. But yes, anectotally we have evidence (emperical at least) that the 5D3 accuracy comes at a penalty in terms of AF lock time in "low light" whatever that means to the user conducting the test. Beyond the emperical and anectotal I have not seen a test constructed with repeatable consistency that shows "lesser" cameras performing better, i.e. under certain EV conditions within the specifications of both cameras, for example.
Cheers for that but it would quite difficult to do qhen ordering via online..
This is where we in the UK & Europe can get our savings as we feel the pricing by Canon is 'ripping' us off and subsidising other markets.
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