2010 February
The new PowerShot S90 combines meticulous styling and exacting image rendering

Photo 1: PowerShot S90
In this month’s report, we examine the features of the PowerShot S90, which went on sale in October 2009. The S90 is equipped with a 10.0-megapixel, high-sensitivity sensor and 3.8x zoom lens with a lens-shift image stabilizer (35mm-film equivalent: 28 – 105mm).
Development objectives
The PowerShot S series has won wide acceptance in the market for pairing, in a compact body design, top-class image quality and sophisticated photographic functions that satisfy both commercial applications and the advanced amateurs.
The PowerShot S90 (Photo 1) is the first new PowerShot S series model in quite some time. The development aim for this camera was:
Realize a digital camera that stresses “the fun of photography” and “mature excellence” while continuing the PowerShot S series tradition of high image quality and rich functionality.
Feature 1 — Advanced image quality
10.0-megapixel, high-sensitivity sensor
The new 10.0-megapixel, high-sensitivity sensor was developed with the latest technology to make it dramatically more sensitive than previous sensors. The improved sensor sensitivity allows photographers to shoot and record images at the same ISO settings, but with less noise than previous models.
High-quality 3.8x zoom lens with a lens-shift image stabilizer
We developed a new f/2.0 (wide) – f/4.9 (tele) 3.8x zoom lens with a 35mm-equivalent focal length range of 28 – 105mm especially for the PowerShot S90. The lens is constructed with seven elements in six groups, including two double-sided molded aspherical elements, one using UA glass. The inclusion of high-refraction and high-dispersion glass achieves superb aberration correction. The lens design has also been optimized to virtually eliminate aberration fluctuations during image stabilization.
The PowerShot S90 is particularly good at shooting blur-free photos in low-light situations because of its high-sensitivity sensor and its fast f/2.0 lens at the wide-angle end.
Lens-shift image stabilizer
To minimize the effects of camera shake on image quality while shooting ,the S90 is equipped with a lens-shift image stabilizer.. With its redesigned gyrosensor and control circuitry, the S90’s stabilizer gives the photographer as much as a four-stop gain in shutter speed.
RAW support
In answer to the requests of professionals and advanced amateurs alike, the PowerShot S90 has the RAW mode found on the PowerShot G series cameras. It uses the CR2 RAW format, which represents a large gain in usability because the format is also employed on our EOS Digital cameras and can be processed using Digital Photo Professional.

Photo 2: i-Contrast comparison
i-Contrast
The PowerShot S90 comes with i-Contrast, a feature that adaptively applies image correction based on an analysis during the signal processing stage of the exposure, dynamic range, and other characteristics of the captured image.
Because i-Contrast corrects the image’s entire dynamic range, it can maintain shadow detail like conventional brightness adjustment functions while ensuring that the highlights are preserved in scenes prone to highlight blowout (Photo 2).
With the powerful noise reduction of the DIGIC 4, contrast adjustments are made without introducing noticeable noise.
The i-Contrast function can be applied during playback as well.*
*However, i-Contrast is unable to recover detail from black areas or blown highlights once the photo is taken.
Servo AF/AE
We introduced Servo AF in our autumn 2008 models. The Servo AF mode tracks the subject even if it moves as long as the shutter button is held halfway down.
The PowerShot S90 improves on the previous Servo AF’s functionality by implementing full-time AE while Servo AF is active.
DIGIC 4 provides high-quality image processing
High-precision AE and AWB using iSAPS technology
Feature 2 — Sophisticated functionality
Step Zoom
The Step Zoom feature enables the photographer to stop the zoom at preset focal lengths. The preset focal lengths are 28mm, 35mm, 50mm, 85mm, and 105mm (35mm-film equivalents), which are typical of prime interchangeable lenses for SLR cameras and which include the maximum wide-angle and telephoto focal lengths.
Step Zoom gives the sense of switching between prime lenses while shooting.

Figure 1: ISO speed selection screen
ISO speeds adjustable in 1/3-step intervals
On most cameras the ISO speed is adjustable in full-step intervals, such as ISO 100, 200, 400, 800, and 1600.
The PowerShot S90, however, offers adjustments in 1/3-step intervals, for finer settings to match each particular scene (Figure 1).
The available ISO speed settings are: 80, 100, 125, 160, 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600, 2000, 2500, and 3200.

Figure 2: White balance fine-tuning
White balance fine-tuning control
Previous models provided multiple white balance presets, such as Auto, Day Light, Cloudy, Tungsten, Fluorescent, Fluorescent H, Flash, Underwater, and Custom. In any setting other than Custom, the camera automatically sets the optimal color temperature for the shooting conditions centered on the respective light source’s color temperature, but the PowerShot S90 now lets the photographer manually fine tune the white balance color temperature starting from the preset.
Specifically, the photographer can adjust the blue-amber balance and the green-magenta balance (Figure 2).
Full Auto
We introduced the “full” Auto shooting mode, which is a marked improvement over past Auto shooting modes, with our 2009 models. The full Auto mode accurately judges the shooting scene and applies the appropriate image processing for that scene through a combination of our previous face-detection technology and motion-detection technology and our new scene-detection technology.
To indicate to the user which scene the camera has detected, the LCD monitor displays special color-coded scene icons (Table 1).
The PowerShot S90 delivers even better scene-detection performance in the Auto mode and tracks the movement of faces more closely within the frame. After detecting a face in the frame and then determining that the face is moving, the camera will continue to adjust the focus and exposure on the face until the shutter button is fully depressed.
This means fewer missed photo opportunities because the camera continues to focus from the time the subject is framed until the moment the image is captured.

Table 1: Detected-scene icons used in the Auto shooting mode
Low Light shooting mode
The Low Light shooting mode replaces the previous ISO 3200 mode. Since the S90’s maximum ISO speed has been boosted to 12,800, the Low Light mode has been designed to automatically adjust the ISO speed between 320 and 12,800 by factoring in the ambient brightness, subject movement, and camera shake.
As a result, the Low Light mode can accommodate a wide range of shooting conditions from low-light scenes to normally lit scenes. Note that in this mode the recorded image size is fixed at 1824×1368 pixels, or about 2.5 megapixels.
Nostalgic scene mode
The S90 comes with a new Nostalgic scene mode. This mode simulates through image processing the distinctive color, contrast, and roughness of aged photos, so users can obtain photos that appear to have aged years or decades.
By turning the control ring, the user can select from five effect levels and check the effect on the LCD monitor while shooting (Photo 3).

Photo 3: Nostalgic mode effect levels
Adjustable AF frame size
Safety FE avoids blown highlights during flash photography
My Colors customization
Selectable first/second-curtain flash synchronization
Real-time histogram
Focus bracketing/AE bracketing
Feature 3 — More comfortable operation

Photo 4: Control ring
Control ring
The PowerShot S90 has a control ring (Photo 4), a first for a Canon compact camera. Turning the ring quickly selects a number of functions. When the control ring is used in combination with the rear-panel control dial, the user can change shooting parameters, such as the shutter speed or ISO speed, for each shooting mode.
Table 2 indicates the specific function assignments for each shooting mode.
| ShootingMode | M | Av | Tv | P | AUTO | SCN | Movie | |
|---|---|---|---|---|---|---|---|---|
| Control | Ring | Av | Av | Tv | ISO | StepZoom | Zoom (Effect level when in Nostalgic mode) |
Zoom (when in standby only) |
| Dial | Tv/(MF) | EXP/(MF) | EXP/(MF) | EXP/(MF) | ||||
| Ring | ISO | ISO | ISO | ISO | ||||
| Dial | Av/Tv/(MF) | Av/EXP/(MF) | Tv/EXP/(MF) | EXP/(MF) | ||||
| Ring | Tv | EXP | EXP | EXP | ||||
| Dial | Av/(MF) | Av/(MF) | Tv/(MF) | ISO/(MF) | ||||
| Ring | Focus | Focus | Focus | Focus | ||||
| Dial | Av/Tv | Av/EXP | Tv/EXP | EXP | ||||
| Ring | WB adjustment | WB adjustment | WB adjustment | WB adjustment | ||||
| Dial | Av/Tv/(MF) | Av/EXP/(MF) | Tv/EXP/(MF) | EXP/(MF) | ||||
| Ring | Zoom | Zoom | Zoom | Zoom | ||||
| Dial | Av/Tv/(MF) | Av/EXP/(MF) | Tv/EXP/(MF) | EXP/(MF) | ||||
Table 2: Parameters the control ring and control dial can be used to adjust

Figure 3: Self-timer setup screen
Easier-to-use self-timer
The control ring can be used to quickly set the duration and number of exposures for the self-timer function. For better legibility, the S90 features a newly designed self-timer display that looks like an analog clock dial (Figure 3).
| Still-image shooting modes (flash settings) |
Auto | Pops up when mode is selected |
|---|---|---|
| On | Pops up when mode is selected | |
| Slow Synchro | Pops up when mode is selected | |
| Off | Closed | |
| Movie shooting mode | Closed | |
| Playback mode | Closed | |
| Powered off | Closed | |
Table 3: Flash operation
Auto pop-up flash
The built-in flash automatically pops up and closes according to the flash mode and the need for extra illumination. Table 3 indicates when the flash operates.
3.0-inch LCD monitor with 461,000 pixels
The S90 is fitted with the same bright, 3.0-inch, 461,000-pixel LCD monitor as the PowerShot G10.
The monitor has a wide viewing angle, excellent color reproduction, and multicoat processing that gives exceptionally high contrast even when viewed at an angle.
On-screen tips
Customizable My Menu screen for frequently used shooting options
Range-specified bulk printing and deleting
Shutter sounds are linked to the actual shutter speed
Playback button
Customizable info display
Feature 4 — Enhanced printing options and digital communications
Add images to the DPOF print list
Users can quickly add an image to the print list during playback by pressing the Direct Print button.
After connecting the camera to a printer, instructions will appear on the monitor. By following the instructions, the user can easily print images from the print list.
Supports PictBridge
Able to enjoy the Canon iMAGE GATEWAY Web site
Waterproof case
The WC-DC35 waterproof case (sold separately) allows the S90 to be used underwater to depths of 40 meters.
Soft case
The special PSC-2500 soft case is available as an option to protect the camera body. The case is made from genuine top-quality leather (Photo 5).

Photo 5: PSC-2500 soft case

Photo 6: PowerShot S90 and kit components
This concludes our look at the PowerShot S90 this month.
Table 4 lists the camera’s main specifications, and Photo 6 illustrates the kit components that come with the camera. There is no fixed retail price suggested for the PowerShot S90.
| PowerShot S90 | |
|---|---|
| Imaging sensor | 1/1.7-inch CCD with 10.00 effective megapixels (10.40 total megapixels), high-sensitivity sensor type |
| Color filter type | RGB |
| Photographic lens (35mm-film equivalent) | 6.0– 22.5mm (28 – 105mm), f/2.0 (wide) – f/4.9 (tele), 3.8x zoom |
| Digital zoom | ~4.0x (~15x max. zoom when combined with the optical zoom) |
| LCD monitor | 3.0-inch (TFT color LCD, ~461,000 dots, excellent color reproduction and wide viewing angle) |
| Autofocus | Single/Servo AF, Face Detect AiAF/center point |
| Normal focusing range | Auto mode: 5cm to infinity (wide)/30 cm to infinity (tele); P mode: 50cm to infinity (wide/tele) |
| Macro focusing range | 5 – 50cm (wide), 30 – 50cm (tele) |
| Shutter | Mechanical shutter + electronic shutter |
| Shutter speeds | 1/1600 – 1 sec., 1/1600 to 15 sec. (total shutter speed range from all shooting modes) |
| Light metering methods | Evaluative, Center-weighted average, Spot (fixed to center) |
| Exposure compensation | ±2 stops in 1/3-stop increments |
| ISO speeds (Standard Output Sensitivity) | Auto, ISO 80 – 3200 (in 1/3-step increments) |
| Flash ranges | 50cm – 6.5m (wide), 50cm – 2.5m (tele) (when ISO speed is set to Auto) |
| White balance | Auto, Day Light, Cloudy, Tungsten, Fluorescent, Fluorescent H, Flash, Underwater, Custom |
| Shooting modes | Auto, C, M, Av, Tv, P, Low Light, SCN*, Movie *Portrait, Landscape, Night Snapshot, Kids & Pets, Indoor, Sunset, Night Scene, Fireworks, Beach, Underwater, Aquarium, Foliage, Snow, Color Accent, Color Swap, Nostalgic, Stitch Assist, Movie |
| Continuous shooting | Normal continuous shooting: ~0.9 shots/sec. Low Light continuous shooting: ~2.1 shots/sec. LV continuous shooting: ~0.6 shots/sec. AF continuous shooting: ~0.6 shots/sec. |
| Image quality (still images) | Recording pixels: Large, Medium 1, Medium 2, Medium 3, Small, Widescreen, RAW, (medium); Compression: Fine, Normal |
| Recording pixels (still images) | Large/RAW: 3648 × 2736, Medium 1: 2816 × 2112, Medium 2: 2272 × 1704, Medium 3: 1600 × 1200, Small: 640 × 480, Widescreen: 3648 × 2048 |
| Movies | Standard, Color Accent, Color Swap: 640 × 480 (30 fps), 320 × 240 (30 fps), MOV format |
| Recording media | SD memory card, SDHC memory card, MMC card, MMCplus card, HC MMCplus card |
| Color space | Standard (sRGB) |
| File format | Compliant with DCF and DPOF |
| Power supply | Rechargeable lithium-ion battery: NB-6L AC adapter kit: ACK-DC40 (sold separately) |
| Dimensions (excluding protruding parts) | 100.0 × 58.4 × 30.9mm |
| Weight (camera only) | ~175 grams |
Table 4: Main PowerShot S90 specifications