Canon
WP-DC30 Housing
and PowerShot
A75 Camera
|
|
WP-DC30
Housing for Powershot A75, A85
Materials: Polycarbonate,
ABS, Glass, Silicone main O-ring, small parts in stainless steel.
Dimensions /mm: 137.8 x 96.4
x 85.3, excluding protrusions.
Weight: 360g approx., case
only. 685g approx. with camera, CF card and batteries.
Internal Volume: 700cm³,
approx.
Operating Temp: 0 - 40°C,
dictated by camera. |
Photographs © Cameras
Underwater 2004. |
|
Canon PowerShot A75 and WP-DC30 Test Pictures
Full-frame, uncorrected |
Full size corner detail |
|
An uncorrected image is shown above. Optical performance is typical
for an air-corrected lens behind a flat port, and the image is
free from processing artefacts. Correction is not necessary,
but the elctronically 'clean' image permits a useful improvement
to be obtained if so desired. The image corrected for pincushion
distortion and chromatic aberration using Panorama Tools, with
slight adjustments to contrast and colour balance using Photoshop,
is shown below. |
Image Data
Camera: Canon PowerShot A75
CCD Type: 1/2.7". Aspect: 4:3
Focal length = 173/32 = 5.406mm
35mm equiv focal length: 35mm nominal
Diagonal field of view: Air: 63.5°, UW: 46.5°
Shutter: 1/50. Aperture: f/2.8
ISO Speed: 100. EV Bias: 0.00
Exposure: EV 8.6. Brightness: EV 8.6
Metering: Matrix
Light Source: 2 x 30W HID
White bal: Auto |
|
Image after correction. |
Corner detail after correction. |
The PanoTools radial correction coefficients used were:
|
Note: The photographs above
are not a test of flash performance. The light source used was
2x Greenforce Marine 'Squid' 30W HID lamps mounted on lighting
stands on either side of the camera. |
Photographs by Rob Hancock, John Bantin, David
Knight © Cameras Underwater 2004. |
3.2M pixels effective.
2048 x 1436 max.
Depth rating 40m
(JIS Class 8)
Internal flash
is usable underwater. 
