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5D3 + 430EX II/580EX II

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gomuzeick:
One advantage of the 600EX-RT is that it is able to use all of the 61 AF points on the 5D3. What does this mean exactly when using the 5D3 with the older 430EX II/580EX II?

Is it simply that the auto-assist beam doesn't work on the new points or are there other issues when using some of the new AF points with these older speedlites?

Thanks

JerryKnight:
I think it's a fairly simple limitation, that the 580/430 AF assist beam is narrow and only casts its pattern over a few center focus points. The 600 simply has a wider pattern that covers all of the 5D3's focus points. This never really mattered on the 5D2 because the only reliable focus point was the center point. Now that we can trust at least the 41 cross-type focus points on the 5D3, it's actually a pretty big deal that the 600 (and I assume the ST-E3) AF assist covers a wider angle.

So if you're using the 5D3 with a 580 or 430 in a dark setting, you might want to revert back to using one of the center focus points, just so the AF assist beam will be the most effective.

neuroanatomist:

--- Quote from: JerryKnight on May 15, 2012, 02:38:15 AM ---it's actually a pretty big deal that the 600 (and I assume the ST-E3) AF assist covers a wider angle.

--- End quote ---

That's why I picked up a 600EX-RT in advance of my 1D X.

But...the ST-E3 does not have an AF assist lamp, at all.

JerryKnight:

--- Quote from: neuroanatomist on May 15, 2012, 10:40:03 AM ---
--- Quote from: JerryKnight on May 15, 2012, 02:38:15 AM ---it's actually a pretty big deal that the 600 (and I assume the ST-E3) AF assist covers a wider angle.

--- End quote ---


That's why I picked up a 600EX-RT in advance of my 1D X.

But...the ST-E3 does not have an AF assist lamp, at all.

--- End quote ---


Bummer.. The ST-E2 had a comparable AF assist as the 580ex2, so I wonder why they chose to remove it. Actually, that makes absolutely no sense at all. Are you sure about this?

EDIT: Yep, you're completely right. Canon's specs says "N/A" for AF assist. That is so strange. Wouldn't you still need an AF assist beam when you're shooting with remote RT flashes?

I think it's time for someone to invent a good, compact 3rd party AF assist device..

neuroanatomist:

--- Quote from: JerryKnight on May 15, 2012, 11:56:26 AM ---I wonder why they chose to remove it. Actually, that makes absolutely no sense at all.

--- End quote ---

It makes sense if you're the Marketing department.  If it has an AF assist lamp, it can generate an optical signal. If it can generate an optical signal, it can, in theory, control slave flashes in the Canon system via an optical trigger.  If it can do that, you don't need to buy the 600EX-RT.  If you have more than one 600EX-RT and older flashes, it can't control both other RF flashes and optically-controlled flashes at the same time.  My cynical mentality says that feature was removed in an effort to increase sales of 600EX-RT units to people who aloready have perfectly serviceable 580/430 units, and, of course, to boost sales of the RF receiver they'll eventually release, once sales of the 600EX-RT drop.

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