Canon PowerShot G2 Review
Image Processing Adjustments
The G2 allows for control over three aspects of the cameras internal processing algorithms. You can alter the sharpening, contrast and saturation of images. Although these settings are available in RAW mode they are not applied to the image in-camera but are stored in the RAW image headers as the default settings for the TWAIN acquire module.
|Contrast -1||Contrast 0||Contrast +1|
|Saturation -1||Saturation 0||Saturation +1|
|Sharpening -1||Sharpening 0||Sharpening +1|
As you can see each of these settings changes is relatively subtle, those users who prefer their colours to be bright and vivid straight out of the camera will probably opt for Saturation +1. Those who are more purist will probably leave the Saturation setting alone and use Contrast -1 to maintain as much detail as possible.
Colour Effect exposure mode
Gone is the G1's "BW" exposure mode, to be replaced by a new 'Colour Effect' mode which provides four different post-processing colour effects (including black and white). This mode is essentially equivalent to exposure mode 'P' but with the additional post-processing effects.
|Colour Effect: Vivid||Colour Effect: Neutral|
|Colour Effect: Sepia||Colour Effect: Black and White|
As you can see the 'Vivid' colour effect gives very strong and vivid colours, these won't be to everyone's taste but could be useful if shooting dull, blue sky dominated or shots only for a computer monitor. The 'Neutral' effect tones colours right down which could be useful for maintaining a wide colour gamut.
Readers of my reviews will know I'm not a huge fan of digital zoom as it's often a badly implemented and seldom used (by owners) marketing "ploy" to sell cameras which don't have an optical zoom. The G2 has a 3.0 x optical zoom, and various digital zoom levels which appear after full telephoto (if you have digital zoom enabled).
|No Digital Zoom, equiv. 3x zoom||Digital Zoom x1.4|
|Digital Zoom x1.8||Digital Zoom x2.2|
|Digital Zoom x2.7||Digital Zoom x3.6|
Digital Zoom is simply cropping (selecting the mid part of the image) and sampling-up, the only advantage in doing digital zoom inside the camera is if you are using resolutions lower than maximum.
Aperture Priority Mode
Aperture priority is where you designate the aperture and the camera calculates the best shutter speed, if the exposure is outside of the cameras range (either over or under exposing) the nearest shutter speed will display in red on the LCD screen. Used properly Aperture Priority can be invaluable as it has a direct effect on depth of field (the distance in front and behind the focal point which will be in focus when taking the shot).
The G2 has a good range of available apertures:
- Wide: F2.0, F2.2, F2.5, F2.8, F3.2, F3.5, F4.0, F4.5, F5.0, F5.6, F6.3, F7.1, F8.0
- Tele: F2.5, F2.8, F3.2, F3.5, F4.0, F4.5, F5.0, F5.6, F6.3, F7.1, F8.0
Aperture Priority is an exposure mode is accessed by turning the exposure dial to Av. You can change aperture by pressing the left or right arrow keys on the 4-way controller. A basic example of aperture priority is shown below for more read my digital photography glossary:
| F2.2, 1/60s
(Less depth of field)
|F8.0, 1/6 s
(Most depth of field)
Shutter Priority Mode
Shutter priority is where you designate the shutter speed and the camera calculates the correct aperture, if the exposure is outside of the cameras range (either over or under exposing) the nearest aperture will display in red on the LCD screen. For more read my digital photography glossary.
The G2 has a wide range of shutter speeds:
- 1/1000, 1/800, 1/640, 1/500, 1/400, 1/320, 1/250, 1/200, 1/160, 1/125, 1/100, 1/80, 1/60, 1/50, 1/40, 1/30, 1/25, 1/20, 1/15, 1/13, 1/10, 1/8, 1/6, 1/5, 1/4, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.3, 1.6, 2, 2.5, 3.2, 4, 5, 6, 8, 10, 13, 15 secs
Focusing manually is far easier on the G2 than the G1 due to a number of factors. First of all there are far more focus points (over 60), secondly when you focus manually there's a ruler display on the left side of the screen (in both m/cm and ft/in) which indicates the current distance. Lastly there's the useful (if slightly blocky) magnified loupe area in the center of the current AF frame, this makes it easy to choose the focus position as you can see below:
|Focused on green bobbin||Focus on pink bobbin|
Bracketing is the automatic exposure of an odd number of frames, typically three or five, over and under exposed by equal steps to enable the photographer to select the best exposed frame at a later time. The G2 supports bracketing of three shots at either +/- 0.3, 0.7, 1.0, 1.3, 1.7 or 2.0 EV from the metered exposure, it takes the normal shot first followed by the under then over exposed shots. This option is available in P, Tv (Shutter Priority) and Av (Aperture Priority) exposure modes. The sample below was shot with 1.0 EV bracketing.
| 1/50 sec, F3.2
| 1/60 sec, F4.0
(-1.0 EV exposure)
|1/250 sec, F2.2
(+1.0 EV exposure)
|Top Gun-2783 by vbuhay|
from Action Film Titles
|Circle in Square by RJD13|
from Square (Rectangle) and Circle
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