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Timing & Performance

The 750Z's retro looks appear to echo parts of its performance. The 3.6 second startup feels like a very long time and once on it does seem to take another second or so to 'ready' itself before you can take a shot (4.8 seconds off to shot taken is slow these days). The 750Z was another camera which had a tendency to get into an AF hunt in mid to low light or at telephoto, waiting for over two seconds to see if it's actually going to get a lock isn't fun. Also poor is the camera's buffer size and continuous shooting (if you can really call it that). Overall the 750Z is usable but never feels quick.

Timing Notes

All times calculated as an average of three operations. Unless otherwise stated all timings were made on a 3056 x 2296 JPEG image (approx. 2,600 KB per image).

Media used for these tests

  • 512 MB SanDisk Extreme SD card
  • 512 MB Lexar 32x High-Speed SD card
Action Details
SanDisk SD
Time, secs
Lexar SD
Time, secs
Power: Off to Record Live view 3.6 3.6
Power: Record to Off   3.1 3.1
Mode: Record to Play Image displayed 1.8 1.8
Mode: Play to Record Live view 1.2 1.2
Play: Magnify To 10x magnification 6.3 6.3
Play: Thumbnail view 3 x 3 thumbnails 1.5 1.5

Action
 
Details
Time, secs
Half-press Lag (0->S1) Wide angle (Wide AF Area) 0.5 - 1.5
Half-press Lag (0->S1) Wide angle (Spot AF Area) 0.6 - 2.0
Half-press Lag (0->S1) Telephoto (Wide AF Area) 0.6 - 2.5
Half-press Lag (0->S1) Telephoto (Spot AF Area) 0.7 - 2.5
Half to Full-press Lag (S1->S2) Viewfinder 0.1
Half to Full-press Lag (S1->S2) LCD Monitor 0.1
Full-press Lag (0->S2) Wide angle (Wide AF Area) 0.6
Off to Shot Taken Wide angle (Wide AF Area) 4.8
Shot to Shot Record review On 2.2
Shot to Shot Record review Off 2.0

Lag Timing Definitions

Half-press Lag (0->S1)
Many digital camera users prime the AF and AE systems on their camera by half-pressing the shutter release. This is the amount of time between a half-press of the shutter release and the camera indicating an auto focus & auto exposure lock on the LCD monitor / viewfinder (ready to shoot).
 

(Prime AF/AE)
Half to Full-press Lag (S1->S2)
The amount of time it takes from a full depression of the shutter release button (assuming you have already primed the camera with a half-press) to the image being taken.
 

(Take shot, AF/AE primed)
Full-press Lag (0->S2)
The amount of time it takes from a full depression of the shutter release button (without performing a half-press of the shutter release beforehand) to the image being taken. This is more representative of the use of the camera in a spur of the moment 'point and shoot' situation.
 

(Take shot, AF/AE not primed)

Continuous mode

The tables below show the results of our continuous shooting test, indicating the actual frame rate along with maximum number of frames and how long you would have to wait after taking the maximum number of frames before you could take another shot. Media used for these tests was a 512 MB Lexar 32x High-Speed SD card. Shutter speed was kept above 1/250 sec during these tests.

Image Type
Avg. frames
per sec
Frames in one burst

Delay before
next shot
*1

3056 x 2296 JPEG 1.0 fps 5 4.5 sec
3056 x 2296 JPEG 1.0 fps 11 3.1 sec
2048 x 1536 JPEG 1.0 fps 13 3.2 sec

*1 You can take a frame as soon as there is space in the cameras internal buffer (writing continues "in the background").

Just one frame per second and only eleven images in 'standard' () image quality mode, it's a bit disappointing. In reality the 750Z lags behind its quoted performance of 'approximately 1.3 fps' and doesn't have a big enough buffer to provide a useful continuous shooting capability.

File Write / Display and Sizes

Timings shown below are the time taken for the camera to process and "flush" the image out to the storage card, the timer was started as soon as the shutter release was pressed and stopped when activity indicator beside the viewfinder had gone out. This means the timings also include the cameras processing time and as such are more representative of the actual time to "complete the task".

Media used for these tests

  • 512 MB SanDisk Extreme SD card
  • 512 MB Lexar 32x High-Speed SD card
Image Type Time to write, secs *1 Time to display, secs *2
SanDisk Lexar SanDisk Lexar
3056 x 2296 TIFF 11.8 12.1 6.9 6.8
3056 x 2296 JPEG 3.2 3.4 1.8 1.6
3056 x 2296 JPEG 2.8 2.8 1.4 1.3
2048 x 1536 JPEG 2.8 2.8 1.2 1.2

*1 As with most digital cameras there is a delay before the actual media write begins, the timings above include this delay (as they're taken from the shutter release). For JPEG images this appears to be around 1.4 sec, for TIFF around 4.5 sec. Hence you must subtract this from the figures above to get the actual media write time.
*2 The camera displays a 'rough image' almost immediately and then takes the measured amount of time to load the full resolution image and display it. This full resolution image is of course also required if you wish to magnify.

File sizes

Image Type File size
(approx.)
Images on a
512 MB Card
3056 x 2296 TIFF 20,668 KB 24
3056 x 2296 JPEG 2,500 KB 124
3056 x 2296 JPEG 1,500 KB 248
2048 x 1536 JPEG 1,500 KB 277

The 750Z continues to write in the background and so the live view returns approximately 1.6 seconds after taking a shot (except for TIFF which locks the camera until completed). This means you can almost always take the next shot even if something is still in the camera's buffer. Write speed was above average and about what we expect of a camera at this level, there also appeared to be little performance difference between the SanDisk and Lexar cards.

Low Light Auto Focus

This test is designed to measure the minimum amount of light under which the camera can still focus. The focus target is our lens distortion test chart (shown here on the right), camera is positioned exactly 2 m (6.6 ft) away.

Light levels are gradually dropped until the camera can no longer focus. This is carried out at both wide angle and telephoto zoom positions (as more light reaches the focusing systems with a larger aperture).

Focal length
Aperture
at focal len.
AF Assist Lamp
Lowest light focus
Wide (37.5 mm equiv.) F2.8 On 0.2 EV
Wide (37.5 mm equiv.) F2.8 Off 3.3 EV
Tele (187.5 mm equiv.) F4.6 On Complete Darkness
Tele (187.5 mm equiv.) F4.6 Off 2.3 EV
Light intensity (Lux) = 2.5 x 2^EV (@ ISO 100), 10.76391 Lux = 1 foot-candle (fc)

It has to be said that the 750Z's low light auto focus was disappointing, despite the AF assist lamp the camera still needed some additional ambient light to produce enough contrast for the AF system. Without the AF assist lamp the 750Z needs a moderately light scene before it will reliably (and repeatedly) lock AF.

Battery life

We ran the camera through our new battery life test. This test is designed to be fair and comparative to each camera and battery type:

  • Take 4 shots without flash
  • Wait 2 minutes (50% of the time powering the camera off)
  • Take 1 shot with flash
  • Wait 1 minute
  • Repeat

Batteries are fully discharged and recharged before the test and all cameras were reset to their factory default settings. Here are the results:

Camera
Prosumer / SLR-Like
Battery Power Battery life Number of shots
Minolta DiMAGE 7 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 1 hr 14 mins 125
Minolta DiMAGE 5 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 1 hr 56 mins 195
Nikon Coolpix 5700 EN-EL1 4.8 Wh 2 hr 08 mins 215
Canon PowerShot S40 NB-2L 3.9 Wh 2 hr 13 mins 225
Minolta DiMAGE S304 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 2 hr 18 mins 235
Canon PowerShot S45 NB-2L 3.9 Wh 2 hr 28 mins 240
Nikon Coolpix 4500 EN-EL1 4.8 Wh 2 hr 27 mins 250
Fujifilm FinePix 6900Z NP-80 4.1 Wh 2 hr 29 mins 250
Nikon Coolpix 990 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 2 hr 30 mins 255
Nikon Coolpix 995 EN-EL1 4.8 Wh 2 hr 30 mins 255
Nikon Coolpix 5000 EN-EL1 4.8 Wh 2 hr 32 mins 260
Minolta DiMAGE 7Hi 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 2 hr 33 mins 260
Canon PowerShot Pro1 BP-511A 10.2 Wh 2 hr 36 mins 265
Canon PowerShot S50 NB-2L 3.9 Wh 2 hr 39 mins 270
Minolta DiMAGE S404 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 2 hr 39 mins 270
Sony DSC-V1 NP-FC11 2.8 Wh 2 hr 39 mins 270
Olympus C-7000 Zoom LI-12B 4.5 Wh 2 hr 44 mins 280
Nikon Coolpix 8700 EN-EL1 5.0 Wh 2 hr 45 mins 280
Minolta DiMAGE 7i 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 2 hr 46 mins 270
Olympus E-20 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 2 hr 48 mins 285
Canon PowerShot G1 BP-511 8.1 Wh 3 hr 00 mins 300
Nikon Coolpix 5400 EN-EL1 4.8 Wh 3 hr 06 mins 315
HP Photosmart 850 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 3 hr 12 mins 325
Sony DSC-S75 NP-FM50 8.6 Wh 3 hr 15 mins 330
Nikon Coolpix 8800 EN-EL7 8.1 Wh 3 hr 27 mins 350
Fujifilm FinePix S602Z 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 3 hr 29 mins 350
Canon PowerShot G2 BP-511 8.1 Wh 3 hr 32 mins 355
Casio QV-4000 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 3 hr 38 mins 365
Olympus C-5050 Zoom 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 3 hr 48 mins 380
Casio EXILIM EX-P700 NP-40 4.5 Wh 3 hr 48 mins 385
Sony DSC-S85 NP-FM50 8.6 Wh 3 hr 50 mins 400
Sony DSC-F717 NP-FM50 8.6 Wh 4 hr 02 mins 405
Pentax Optio 750Z D-LI7 6.6 Wh 4 hr 03 mins 415
Sony DSC-V3 NP-FR1 4.4 Wh 4 hr 05 mins 415
Nikon Coolpix 8400 EN-EL7 8.1 Wh 4 hr 09 mins 420
Sony DSC-F707 NP-FM50 8.6 Wh 4 hr 20 mins 440
Fujifilm S7000 Zoom 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 4 hr 23 mins 445
Konica Minolta DiMAGE A2 NP-400 11.1 Wh 4 hr 26 mins 450
Canon PowerShot G3 BP-511 8.1 Wh 4 hr 32 mins 455
Canon PowerShot G5 BP-511 8.1 Wh 4 hr 33 mins 460
Pentax Optio 550 D-LI7 6.6 Wh 4 hr 36 mins 465
Minolta DiMAGE A1 NP-400 11.1 Wh 5 hr 02 mins 515
Leica Digilux 2 BP-DC1-E 10.1 Wh 5 hr 05 mins 515
Sony DSC-F828 NP-FM50 8.6 Wh 5 hr 28 mins 540
Fujifilm FinePix S5000 4 x AA NiMH 1600 mAh (GP) 7.7 Wh 5 hr 31 mins 555
Canon PowerShot G6 BP-511A 10.3 Wh 5 hr 38 mins 570
Olympus C-8080 WZ BLM-1 10.8 Wh 5 hr 52 mins 595
Other test notes:
 • LCD monitor is left on during the battery test
 • The camera is powered off half of the time and left on half of the time (switch every 10 iterations)
 • There are now higher capacity AA NiMH batteries available, however in the interests of fair
    comparison we will continue to use our 1600 mAh test set

The Optio 750Z's larger-than-average battery (6.6 Wh) helped it to a four hour performance in our battery tests, very good although less than the Optio 550 did with the same battery. We did note that the camera body got quite warm left switched on.

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