G12 Bug: Self Timer Shutter Delay with Wireless Remote

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Another flash related bug has shown up on the G12. Previously, I griped about the “screen blanking” that occurs when using a (non-Canon) wireless remote to trigger an off-camera flash. Even though the screen would go dark (indicating the manual exposure) with wireless remotes, at least the flash would be triggered. A recent discussion forum thread pointed out that the flash will not be triggered if the internal self timer is used to produce a shutter delay.

I tested my own G12 using Yongnuo RF-602 wireless remote triggers connected to off-camera Canon flashes. The RF-602 triggered the flashes (although the screen went blank) as expected unless the G12 self timer was used to delay the shutter.

The problem was also reported to occur with CyberSync CST remotes.

Apparently the mis-fire does not occur with Canon’s own STE-2 transmitter and Canon flashes.

A work around for self portraits is to add a second RF-602 transmitter and receiver (set to a different channel) along with the Yongnuo shutter connnecting cord LS-02/C1. I did this to get some Halloween pictures.

The G9 does not have this problem – something has changed in the G12 firmware. C’mon Canon, fix our G12s!
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NiZn in the Canon 580EX II Flash

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After a few other tests, I finally felt brave (or foolish) enough to try the NiZn batteries in my Canon 580EX II flash. Before trying the NiZn batteries, I checked the performance of standard 2700mah PowerEX NiMh in the 580EX II at full power. With the flash mounted on my 7D and both flash and camera in full manual mode, I photographed the XNTimer on my computer screen. My procedure was to get off a shot as soon as the ready light of the flash came back on. Five shots took 15.7 seconds.

Next, the NiZn batteries were installed. Five shots took 8.1 seconds.

From this and a few other tests, my conclusion is that the recycle time with NiZn batteries is roughly half the recycle time of NiMh batteries.

I intend to further test these NiZn batteries in normal use and will report the experience.

Again, a warning: Be patient and don't fire off many shots in a short time because the flash may overheat.
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CF Cards for the 7D

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One of the claims to fame of the Canon 7D is its burst speed of 8 frames per second.  One frequently asked question is "Which memory card should I buy?.  Burst speed is often associated with the speed of the memory.  I rounded up a small assortment of SanDisk cards and did a very quick test.

Canon recommends a UDMA compatible card.  Of the four cards tested, only my old 2GB Ultra II was not a UDMA card.  For video, Canon recommends a read/write speed of at least 8 MB/sec.  The old Ultra II is listed at 15 MB/sec, the Extreme IV as 45 MB/sec and the "Extreme" (no suffix) is 60 MB/sec. 

Rob Galbraith has researched, tested and published data for the performance of many memory cards.  I wanted to see for myself.  My normal practice is to shoot in RAW+JPEG mode with the JPEG at the smallest size.  I set the 7D for ISO 400, manual exposure, manual focus, IS turned on.  Each memory card was freshly formatted in the 7D.  My subject was the XNote Timer that I'd used previous to estimate G9 shutter lag.

I simply pushed the shutter button and held it down until more than 30 shots had been fired.  Of course, I never shoot this way but I wanted to see what would happen.

All the cards performed the same for the first eight shots.  That is, no matter which one of the cards was used, the 7D cranked out eight shots in about 0.9 seconds.  Apparently, these eight RAW+JPEG fill up the internal (buffer) memory of the 7D.   After those first eight shots, shooting rate changes.

With the Ultra II, the 7D required 21.7 seconds to fire off 30 shots; that is, 0.9 seconds for the first eight shots then 20.8 seconds for an additional 22 shots. 

The 60MB/sec Extreme(s) and Extreme IV all performed the same as far as I could tell.  With any of those cards, the 7D required 7.7 seconds to get off 30 shots; that is, the first eight shots required 0.9 seconds and the next 22 shots required 6.8 seconds.  The timing was not uniform between shots.  Two shots would be roughly 0.15 seconds apart followed by roughly a half second delay and then another two shots 0.15 seconds apart, etc., etc.

In practice, I've had a few impatient delays with the Ultra II in the 7D but not with the Extreme IV.  I can't speak to any quality or ruggedness differences between the Extreme IV and the Extreme (no suffix).  I've never had a problem with a SanDisk card.  The Extreme (no suffix) are less expensive than the Extreme IV so, for now, that's my card.
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