Casiio Exilim EX-S7 Performance, Timings, and Image Quality

April 20, 2010 by Andy Stanton Reads (737)
Editor's Rating

Ratings Breakdown (1-10)

    • Image/Video Quality
    • 7
    • Features
    • 9
    • Design / Ease of Use
    • 8
    • Performance
    • 7
    • Total Score:
    • 7.75
    • Rating 1 to 10, top score 10

Shooting Performance
The EX-S7 took about two to three seconds to start up and shut down, which is not bad. I was impressed by the absence of shutter lag. As the performance tables show, its times for focus acquisition, when pre-focused and not pre-focused, are extremely short, in DSLR territory. I occasionally had problems finding focus, especially in low light, but the EX-S7 is a quick camera when it comes to shutter lag.

Shutter Lag (press-to-capture, pre-focused)

Camera Time (seconds)
Casio Exilim EX-S7 0.01
Canon PowerShot A3100 IS 0.01
Sony Cyber-shot S2100 0.02
Nikon Coolpix S70 0.02

AF Acquisition (press-to-capture, no pre-focus)

Camera Time (seconds)
Casio Exilim EX-S7 0.16
Canon PowerShot A3100 IS 0.41
Nikon Coolpix S70 0.67
Sony Cyber-shot S2100 0.68

It’s a different story when you want to take successive photos. While shot-to-shot time with the flash enabled was moderate – between four and five seconds – times did not improve with the flash off. Most small cameras take only two or three seconds between photos without the flash, so the EX-S7’s slowness is disappointing. As the studio timing shows, the EX-S7 is also very slow in continuous shooting mode, managing only 0.4 shots per second. The EX-S7 has a high speed continuous shooting mode that takes a quick four shots per second, but the images are low resolution – only two megapixels.

Continuous Shooting

Camera Frames Framerate*
Nikon Coolpix S70 2 1.5 fps
Sony Cyber-shot S2100 1.0 fps
Canon PowerShot A3100 IS 0.9 fps
Casio Exilim EX-S7 0.4 fps

Flash range is up to 9.5 feet at maximum wide angle and 5.2 feet a maximum telephoto. The flash can be set to auto, off, on, soft and red-eye reduction (flashing twice).

Lens Performance
The lens produces photos that are sharp in the center but bit soft in the corners. Vignetting was successful. Chromatic aberration (purple fringing) sometimes appears in high contrast shots.

Casio S7 Test Image

I found barrel distortion to be present at wide angle but there was no pin cushion distortion at maximum zoom:

Casio S7 Test Image
Wide angle

Casio S7 Test Image

Video Quality
The EX-S7 shot HD movies adequately. The movies were smooth with good sharpness, color and decent sound. Optical zoom cannot be used in movie mode. Our sample video offers a view of the cherry blossoms around the Tidal Basin in Washington, D.C.

Image Quality
Images from the EX-S7 had very pleasing color, though overexposure was sometimes a problem. The images are generally sharp, with minor softness in the corners, which is almost impossible to see unless the photo is blown up.The EX-S7 has white balance settings for daylight, overcast, shade, day white fluorescent, daylight fluorescent, tungsten and manual. Auto white balance consistently performed well.

Casio S7 Test Images
Auto White Balance, 3200k incandescent light

As the studio images show, the EX-S7 produces its best images at low ISO levels. Noise becomes visible at 200 ISO, but is not a major problem until 800 ISO. For a relatively low priced camera, the EX-S7 does pretty well in this regard.

Casio S7 Test Images
ISO 64
Casio S7 Test Images
ISO 64, 100% crop
Casio S7 Test Images
ISO 100
Casio S7 Test Images
ISO 100, 100% crop
Casio S7 Test Images
ISO 200
Casio S7 Test Images
ISO 200, 100% crop
Casio S7 Test Images
ISO 400
Casio S7 Test Images
ISO 400, 100% crop
Casio S7 Test Images
ISO 800
Casio S7 Test Images
ISO 800, 100% crop
Casio S7 Test Images
ISO 1600
Casio S7 Test Images
ISO 1600, 100% crop

Additional Sample Images

Casio S7 Test Image Casio S7 Test Image
Casio S7 Test Image Casio S7 Test Image
Casio S7 Test Image Casio S7 Test Image



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