Pentax Optio VS20 review:

Pentax Optio VS20

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2.5 stars

CNET Editors' Rating

The Good Inexpensive; Two shutter buttons; Long zoom.

The Bad Some colour interference; Disappointing movie performance.

The Bottom Line You'll struggle to find a new camera with such impressive specs any cheaper. Sadly, the Pentax Optio VS20's performance didn't stand up to close scrutiny. The dual shutter buttons are a neat feature, but you may be better provided by a high-end camera from last year, which will come close to matching the specs at a similar price.

Visit manufacturer site for details.

5.5 Overall

Ignore their looks and the Pentax Optio VS20 appears to offer the same spec as the twice-the-price Panasonic Lumix DMC-TZ30. Both sport a 20x zoom, resolution in the middle teens and the now obligatory HD movie mode.

So what sets them apart, except from roughly £170? I set out with the Optio VS20 to find out.


The VS20 looks great on paper, with a 16-megapixel sensor and long zoom, equivalent to 28-560mm on a regular 35mm camera. That's an incredibly versatile range, perfect for landscapes at the wider end and long enough to snap distant wildlife when fully extended. It's got optical image stabilisation too, to help steady your handiwork at such long zooms.

Build quality is good, with a sturdy plastic case and neat double shutter controls, each with a zoom rocker. One button is positioned on top of the case, as you'd expect, but the other is sited on the end of the grip so that when you hold the camera horizontally it's hidden in your palm. Turn the camera on one end and it's in the perfect spot to take portrait shots, without having to twist your hand around the camera body. It's a neat feature that's usually only found on dSLRs with optional battery pack add-ons.

Pentax Optio VS20 upright
With two shutter buttons, one of which is on the side, you can easily take portrait shots.

It has both smile and blink detection -- the first firing the shutter when it detects smiles in your image, and the latter warning you if someone blinks at the point of capture. You can also register up to three faces for priority detection. If the VS20 spots them in the frame when you're composing your shot, it'll prioritise focus and exposure for them over and above any others.

Elsewhere, its specs are pretty much par for the course. Sensitivity runs from ISO 100 to ISO 1,600, although compensation is a little narrow at +/-2.0EV in 1/3EV steps. To match its rivals it really needs to hit +/-3.0EV.

If you have neither the inclination nor the ability to edit your photos when you get home, you can apply a lot of common effects out in the field. There's a range of digital filters for creating sepia, black and white, toy camera and other in-camera effects, as well as 26 shooting modes.

Potentially the most limiting spec is the shutter speed range. At its fastest it fires at 1/2,500 second, which will be enough to cope with all but the most extreme situations. However, the longest exposure in regular shooting modes tops out at just a quarter of a second, and even if you switch to night scene mode -- the only one that pushes it further -- you still can't hold the shutter open for more than four seconds. This is fairly brief and will limit your options if you want to shoot night-time street scenes or landscapes, when you can't rely on the flash.

Photo tests

The VS20's LCD screen doesn't do its images much justice. It's sometimes a little slow to find the correct exposure, so you might miss a good shot, and when you've taken your picture, the previewed results look insipid and not nearly so punchy as they do when downloaded.

The camera itself did a very good job of maintaining the colour in subjects that were shot against a bright background. The weather vane below, for example, might reasonably have been silhouetted by the overcast sky behind it, but the VS20 retained both the red and green paint on the sail, hull and compass letters. There is also very little evidence of chromatic aberration aside from a slight halo effect around the darker details where they meet the sky.

Pentax Optio VS20 test result
This is a very well captured shot, with the VS20 keeping colours true to the original where some other cameras might have produced a silhouette (click image to enlarge).

Aberration is an unwanted effect, which occurs where the lens doesn't perfectly align each of the available wavelengths of light in the visible spectrum, so that some tones reach a slightly different part of the sensor to others. It most often manifests as a purple fringe on one side of the subject and green on the other, as can be seen in the example below, shot on the VS20, where a green line traces the bottom edge of the sculpture, and a pink runs along the right.

Pentax Optio VS20 test result
A green halo effect on one edge and pink on the other suggests a slight misalignment in the lens of some parts of the visible spectrum (click image to enlarge).

Other shots produced some evidence of colour interference. In the image below, showing plaques set into the concrete base of a sculpture, you would expect to see a clean grey in the stonework and a dark metallic colour in the plates. However, there's a rainbow effect in both areas -- and in particular where the focus falls away outside of the 1cm macro zone.

Pentax Optio VS20 test result
When zoomed to 100 per cent there's evidence of a rainbow effect in some parts of this image that wasn't present in real life (click image to enlarge).

Furthermore, when zoomed to 100 per cent, the fall-off in focus doesn't produce an attractive bokeh effect, with a smooth transition from a sharp subject to a smooth background, as the background here looks like it was shot through a frosted screen. Again, this is due to the colour noise interference.

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