Canon G12 Performance

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Canon PowerShot G12 Performance

Timing and Performance

Slow to average speed for a premium enthusiast's model.

Startup/Shutdown
Power on to first shot	2.7 seconds	Time it takes for LCD to turn on and lens to deploy and capture a picture.
Shutdown	1.6 seconds	How long it takes to retract lens.
Buffer clearing time	2 seconds (after 20 L/F JPEGs)* 2 seconds (after 20 RAW + JPEG files)*	Worst case buffer clearing time. -- This is the delay after a set of shots before you can remove the card. Some cameras won't retract their lenses and shut down until the buffer is cleared.
*Note: Buffer clearing times measured with a SanDisk Extreme III 8GB SDHC memory card. Slower cards will produce correspondingly slower clearing times.

About average startup and shutdown times here (a bit slower than the G11, though). Pretty fast buffer clearing with a fast card, though burst rates are slow enough that a fast card can keep up.

Shutter Response (Lag Time)
Full Autofocus Wide	0.656 second	Time from fully pressing shutter button to image capture, zoom lens at wide angle position.
Full Autofocus Tele	0.754 second	Time from fully pressing shutter button to image capture, zoom lens at telephoto position.
Full Autofocus Flash enabled	0.984 second	Time to capture while forcing flash to fire, zoom lens at wide angle position.
Prefocused	0.076 second	Time to capture, after half-pressing and holding shutter button.

Full autofocus shutter response in the default AF mode is slower than average at wide-angle, at 0.66 second. Full AF shutter lag is about average at full telephoto, at 0.75 second. Enabling the flash increases lag quite a bit to 0.98s, due to the preflash metering involved. "Prefocusing" the camera by half-pressing and holding down the shutter button before the final exposure results in a lag time of 0.076 second, which while fast, isn't quite as fast as some. Performance is similar to the G11, just a touch slower.

Cycle Time (shot to shot)
Single Shot mode Large Fine JPEG	2.40 seconds 1 second to clear	Time per shot, averaged over 20 shots.
Single Shot mode RAW + JPEG	2.70 seconds 2 seconds to clear	Time per shot, averaged over 20 shots.
Early shutter penalty?	No	Some cameras don't snap another shot if you release and press the shutter too quickly in Single Shot mode, making "No" the preferred answer.
Continuous mode Large Fine JPEG	0.51 second (1.97 frames per second); 20+ frames total; 2 seconds to clear	Time per shot, averaged over buffer length or 20 shots, whichever came first.
Continuous mode RAW + JPEG	1.04 second (0.96 frames per second); 20+ frames total; 2 seconds to clear	Time per shot, averaged over buffer length or 20 shots, whichever came first.
Flash recycling	4.1 seconds	Flash at maximum output.
*Note: Buffer clearing times measured with a SanDisk Extreme III 8GB SDHC memory card. Slower cards will produce correspondingly slower clearing times. Slow cards may also limit length of bursts in continuous mode. ISO sensitivity also affects cycle times and burst mode performance, with higher ISOs generally increasing cycle times and reducing burst performance.

Shot-to-shot cycle times are slower than average, at 2.4 seconds for large/fine JPEGs. RAW + JPEG cycle-time was a bit slower, at 2.7 seconds per frame. These results are comparable to the G11's numbers (2.29 and 2.88 seconds respectively).

The PowerShot G12's continuous shooting modes were faster than the G11's (almost twice as fast for JPEGs), but still somewhat sluggish for its class. The G12 captures large/fine JPEGs at 1.97 frames per second (vs 1.11 fps for the G11) , though the camera seemed to be able to capture frames continuously at this rate. The burst rate dropped to 0.96 frames per second when capturing RAW + JPEG files (vs 0.79 fps for the G11), but again with apparently no buffer limit. The flash took 4.1 seconds to recharge after a full-power shot, which is about average and a little better than the G11's 4.5 seconds.

Download Speed
Windows Computer, USB 2.0	6,433 KBytes/sec	Typical Values: Less than 600=USB 1.1; 600-769=USB 2.0 Low; Above 770=USB 2.0 High

Connected to a computer or printer with USB 2.0, download speeds were moderately fast.

Bottom line, the Canon PowerShot G12's timing performance was generally slow to average for its class. Startup and shutdown times were about average, autofocus speeds and shutter lag were slower than average, as were full resolution continuous modes. Buffer depths and buffer clearing were however quite good, but not really a surprise given the slow burst rate and 10-megapixel files.

Battery and Storage Capacity

Battery
Excellent battery life for a lithium-ion design.

Operating Mode	Number of Shots
Lithium-ion Rechargeable Battery, Optical Viewfinder (CIPA standard)	1,000
Lithium-ion Rechargeable Battery, LCD Monitor (CIPA standard)	370

The Canon PowerShot G12 uses a custom rechargeable lithium-ion battery for power, and ships with a charger. Battery life is excellent (just slightly lower than the G11's 390 shot rating when using the LCD), though we still recommend you pick up a spare battery and keep it freshly charged and on-hand for extended outings.

The table above shows the number of shots the camera is capable of (on a fully-charged rechargeable battery as appropriate), based on CIPA battery-life and/or manufacturer standard test conditions.

(Interested readers can find an English translation of the CIPA DC-002 standards document here. (180K PDF document))

Storage
The Canon PowerShot G12 accepts MMC/SD/SDHC/SDXC memory cards, and does not include any built-in memory or a starter card. Canon recommends using a card with Speed Class 4 or faster for capturing movies.

	Images (Avg Size)	367 2.8 MB	754 1.4 MB	67 15.3 MB	56 18.1 MB
Image Capacity with 1GB Memory Card		Fine	Normal	RAW	RAW + JPEG
3,648 x 2,736	Images (Avg Size)	367 2.8 MB	754 1.4 MB	67 15.3 MB	56 18.1 MB
	Approx. Comp.	11:1	22:1	1:1	-
2,816 x 2,112	Images (Avg Size)	580 1.8 MB	1,160 863 KB	-	-
	Images (Avg Size)	580 1.8 MB	1,160 863 KB	-	-
	Approx. Comp.	10:1	20:1	-	-
1,600 x 1,200	Images (Avg Size)	1,588 645 KB	3,017 339 KB	-	-
	Images (Avg Size)	1,588 645 KB	3,017 339 KB	-	-
	Approx. Comp.	9:1	17:1	-	-
640 x 480	Images (Avg Size)	5,029 204 KB	7,543 136 KB	-	-
	Images (Avg Size)	5,029 204 KB	7,543 136 KB	-	-
	Approx. Comp.	5:1	7:1	-	-

We strongly recommend buying a large capacity SDHC memory card at least a 4GB card, preferably an 8GB or larger one, to give yourself extra space for extended outings, RAW files or video. (Check the shopping link above, cards are really cheap these days, so no reason to skimp.)