"Picky Details" for the Casio EX-Z750 digital camera
(Timing, Power, and Storage Info)
Timing
When you press the shutter release on a camera, there's usually a lag time or delay before the shutter actually fires. This corresponds to the time required for the autofocus and autoexposure mechanisms time to do their work, and can amount to a fairly long delay in some situations. Since this number is rarely reported on (and even more rarely reported accurately), and can significantly affect the picture taking experience, I routinely measure both shutter delay and shot to shot cycle times for all cameras I test, using a test system I designed and built for the purpose. (Crystal-controlled, with a resolution of 0.001 second.) Here are the numbers I collected for the Casio EX-Z750:
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(secs) |
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| Power On -> First shot |
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LCD turns on and lens extends forward. Pretty fast.
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| Shutdown |
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First time is time to retract lens, second time is worst-case buffer-clearing time. Pretty fast for lens retraction, fairly slow for buffer clearing. (A maximum of 3 large/fine shots in the buffer.)
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| Play to Record, first shot |
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Time until first shot is captured. A little slow.
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| Record to play |
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First time is that required to display a large/fine file immediately after capture, second time is that needed to display a large/fine file that has already been processed and stored on the memory card. Pretty fast.
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| Shutter lag, full autofocus |
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First time is at full wide-angle, second is full telephoto. Very fast, much faster than average. |
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Shutter lag, "Quick Shutter" |
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Even faster, exceptional speed.
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| Shutter lag, manual focus |
0.096
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Extremely fast. |
| Shutter lag, prefocus |
0.010
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Time to capture, after half-pressing shutter button. Extremely fast. |
| Cycle Time, max/min resolution |
1.41 / |
First number is for large/fine files, second number is time for "TV" mode (640x480) images. Times are averages. In large/fine mode, shoots 3 frames this fast, then slows to about 2.4 seconds per shot. The buffer clears in 15 seconds. In TV mode, continues at this pace indefinitely, clearing the buffer after each shot. Pretty good speed, but buffer capacity is very limited. |
| Cycle Time, Flash exposures | 6 | Flash at maximum power output. About average, not bad for a compact camera model. |
| Cycle Time, continuous mode, max/min resolution | 0.94 / 0.72 (1.06 / 1.39 fps) |
First number is for large/fine files, second number is time for "TV" mode (640x480) images. Times are averages. In large/fine mode, shoots 2 frames this fast, then slows to about 1.8 seconds per shot. The buffer clears in 15 seconds. In TV mode, continues at this pace indefinitely, clearing the buffer after each shot. Not terribly fast, plus rather limited buffer capacity. |
| Cycle Time, continuous Multi 25 mode | 0.07 (15 fps) |
Camera captures 320 x 240 pixel images, stores them in 5x5 arrays inside normal 1600x1200 files. Speed is set to 15 fps. Buffer clears in 3 seconds. Very fast, albeit at rather small frame sizes. |
Power
The Casio EX-Z750 uses a custom rechargeable LiIon battery for power, and has no external power connector, so we couldn't conduct our normal power-consumption measurements. Based on the CIPA battery-life standard though, Casio claims battery life of 325 shots or 160 minutes of operating time. (Both very good numbers, especially for a compact model.)
Storage Capacity
The Casio EX-Z750 stores its photos on SD / MMC memory cards or in approximately 8.3 MB of internal memory, and no card is included with the camera. (I strongly recommend buying at least a 128 MB card, preferably a 256 MB one, to give yourself extra space for extended outings.) The chart below shows how many images can be stored in the internal memory at each size/quality setting.
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Resolution/Quality 8.3 MB Internal Memory |
Fine | Normal |
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| 3072
x 2304 |
Images (Avg size) |
1 4.7 MB |
3 2.4 MB |
6 1.2 MB |
| Approx. Compression |
5:1 | 9:1 | 17:1 | |
| 2560 x 1920 |
Images (Avg size) |
3 2.4 MB |
4 2.0 MB |
5 1.4 MB |
| Approx. Compression |
6:1 | 8:1 | 10:1 | |
| 2048
x 1536 |
Images (Avg size) |
4 1.9 MB |
6 1.4 MB |
11 723 KB |
| Approx. Compression |
5:1 | 7:1 | 13:1 | |
| 1600 x 1200 | Images (Avg size) |
7 1.2 MB |
10 806 KB |
20 413 KB |
| Approx. Compression |
5:1 | 7:1 | 14:1 | |
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Images (Avg size) |
39 217 KB |
52 165 KB |
83 103 KB |
| Approx. Compression |
4:1 | 6:1 | 9:1 | |
Download Speed
The Casio EX-Z750 connects to a host computer via a USB interface. Downloading files to my Sony desktop running Windows XP (Pentium IV, 2.4 GHz), I clocked it at 2764 KBytes/second, an unusually high rate. (Cameras with slow USB interfaces run as low as 300 KB/s, cameras with fast v1.1 interfaces run as high as 600 KB/s. Cameras with USB v2.0 interfaces run as fast as several megabytes/second.)
Z750 Test Images
Z750 Specifications
Z750 "Picky Details"
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