Sony Cyber-shot DSC-T20

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http://reviews.cnet.co.uk/digitalcameras/0,39030233,49291713,00.htm

Reviewed 26 July 2007

Reviewed by Philip Ryan

Sony's T-series cameras have come down in price significantly since launch, but still manage to include all the latest features you expect in an ultracompact these days. The 8.1-megapixel Cyber-shot DSC-T20's 3x optical, 38mm-to-114mm, f/3.5-to-f/4.3 zoom lens and 64mm (2.5-inch) screen aren't very impressive, but Sony does include its Super Steady Shot optical image stabilisation, as well as face detection and sensitivity of up to ISO 3,200.

Also, if you have an HD TV, the DSC-T20 offers 1080i HD output, if you're willing to spend an extra £29 on Sony's VMC-MHC1 component video cable or £59 for the company's CSS-HD1 high-definition Cyber-shot station.

Design
Sony sticks with the trademark sliding lens cover on the T20, this time accenting it with a shiny silver rectangle that provides a nice counterpoint on the colour models and blends in seamlessly on the silver model. Unfortunately, like the camera's LCD screen, this silver portion is a magnet for fingerprints, especially considering that you have to touch it to slide the lens cover open and closed. If you're bothered by fingerprints, you'll definitely want to carry a microfibre cloth with your T20.

The T20 comes in black, silver, white or pink

Since the proximity of the flash to the lens caused plenty of problems with red-eye and dust backscatter in the DSC-T10, Sony moved it a little further from the lens on the T20. You'll still get red-eye from time to time, of course, and may even see some dust particles light up, but it shouldn't be as bad as the T10.

The rest of the physical camera design follows the normal T-Series modus operandi, with power and playback buttons on the camera's top, a zoom rocker in the upper-right of the camera's back and remaining buttons residing on the bottom-right of the back. The Menu and Home buttons are a tad small and slightly difficult to push with the fleshy part of your finger. We found we had to use our fingernail to press them.

The menu system, however, has been completely redesigned. The Menu button now brings you to either the shooting or playback menu, depending on the mode you're using at the time. A second button labelled 'Home' brings you to a general setup menu where you can select shooting or playback mode and adjust a variety of other setup functions.

If you're used to another camera's menus, you should probably tour these menus, or read the manual carefully, since certain functions may be in a different place. For example, you have to delve into the Home menu if you want to format your memory card, while many cameras have this function in the Play menu. Overall, though, the menus are well designed.

Features
The shooting menu lines up all available functions on the left side of the screen, and available options extend to the right across the screen as you move from one to the next. In program auto mode, you can adjust all the expected functions, such as metering (including centre-weighted and spot), sensitivity (up to ISO 3,200), exposure compensation, white balance and more.

We were pleasantly surprised to find flash compensation, and while there are only three steps (minus, zero and plus), it was enough to keep the flash from blowing out flesh tones when sitting across a small restaurant table. Also, if you're a more experienced photographer, you might like the fixed-focus options, which let you set focus at 0.5m, 1m, 3m, 7m or infinity in case you don't want to wait around for autofocus to do its thing.

That brings us to one of the more complained-about issues with the T10 -- from CNET readers, at least. The T10 and T20 can both occasionally capture an image without completing the autofocus process. According to readers' comments, Sony tech support has said that the cameras are designed to do this, though we don't know why. That means you have to be sure to press the shutter halfway and wait for focus lock (aka prefocus) before capturing your images if you want to be sure to capture an in-focus image.

The menus have been redesigned -- certain functions may not be where you expect them but on the whole they are logical

We prefer to prefocus when we shoot to cut down on shutter lag, so this doesn't interfere with our normal shooting routine, but if you don't like to prefocus, this might not be the camera for you.

Performance
Performance results were pleasingly quick in our lab tests. The DSC-T20 took 1.3 seconds to start up and capture its first JPEG, and took 1.3 seconds between JPEGs thereafter with the flash turned off. When we turned the flash on, that wait increased to 2.9 seconds.

Shutter lag measured an impressive 0.4 seconds in our high-contrast test and 1.3 seconds in our low-contrast test, which mimic bright and dim shooting conditions, respectively. In our continuous shooting test, we were able to get about 2 frames per second regardless of image size.

Image quality
Images looked good for a compact camera, and better in some ways than last year's model, but those benefits came with trade-offs of their own. While colours are more saturated overall in the T20 than the T10, the noise profile is completely different in the T20. This makes sense, given the increase in pixel count and Sony's switch to its new Bionz image processor, which was developed for its Alpha DSLR-A100 digital SLR.

The T20's small, lightweight frame means you'll have no problem fitting it in a pocket or small bag

We saw some -- albeit very minimal -- noise when viewing on our monitor even at the T20's lowest sensitivity setting of ISO 80, though you won't notice it much in prints. The same can be said for ISO 100, though ever so slightly more noise is visible. At ISO 200, however, noise between the two cameras evens out, which is to say that you'll definitely see some on your monitor, though it will be minimised greatly in printing. You still see some advantage in terms of the T20's extra saturation, which is pleasing and not overly saturated, per se. Also, while there is some loss of sharpness at ISO 200, you should still be able to make prints up to letter size that have an acceptable amount of fine detail.

At ISO 400, Sony manages to blur away noise in solid-coloured areas, but loses some shadow detail, thereby decreasing the overall dynamic range, and much of the fine detail is lost. At ISO 800, noise becomes more pronounced, taking on a tight, fine-grained look. More of the shadow detail and fine detail is lost, and images take on the look of a pointillist painting. This effect -- and the associated losses in detail and dynamic range -- continue to amplify as you step up to ISO 1,600 and ISO 3,200. We recommend staying below ISO 800 whenever possible and avoiding ISO 1,600 and ISO 3,200 completely.

Conclusion
The Cyber-shot DSC-T20 is a nice ultracompact, with most of the features that consumers are looking for in a point-and-shoot camera. Sony could do better at keeping noise under control at higher ISOs though, or just not include and tout those higher sensitivity settings in the first place.

Ultimately, the T20 is a stylish, solidly built camera, which is a good choice in its price range as long as you look beyond the hype, remember to prefocus and stick to the lower ISO settings.

Shooting speed (in seconds)
(Shorter bars indicate faster performance)

Typical shot-to-shot time

Time to first shot

Shutter lag (typical)

Sony Cyber-shot DSC-T20

1.3

1.3

0.4

Canon Digital IXUS 70

1.5

1

0.5

Canon Digital IXUS 75

1.6

1

0.5

Nikon Coolpix S50c

2.4

3.9

0.9

 Additional editing by Kate Macefield