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Pentax Optio A40 Review
| Author | Cliff Smith |
| Published | 14th Mar 2008 |
| Manufacturer | Pentax |
| Price | £165.22 (Exc VAT) |
| as reviewed | £190.00 (Inc VAT) |
| Latest Price | Click here |
| Features | ![]() |
| Image Quality | ![]() |
| Value | ![]() |
| Overall | ![]() |
If cameras were sold on looks alone, the A40 would certainly be worth the money. Pentax pretty much invented the ultra-compact digital camera, and over the years it has refined its design down to a fine art. The A40 has a robust all-metal body finished in either matt black or silver, with chrome trim and controls. The design incorporates a small textured thumb grip on the back, and the small raised flash detail on the front also provides some grip, so despite its exceptionally compact dimensions the camera feels solid and secure to hold. It measures just 57 x 89 x 23.5mm and weighs only 150g including battery, and its smooth-cornered shape slips easily into a shirt pocket.

The control layout is basically identical to the Optio A30 and several previous Pentax ultra-compacts. The power button and shutter release are on the top panel, while on the back are the D-pad, playback and menu buttons, the zoom control and the Green Button, the instant easy-mode control found on all of the Optio range. The zoom control is a relatively chunky rocker switch positioned under the right thumb, but it is stiff enough that it isn't easy to operate it accidentally. It's not the most sensitive control in the world though, and the zoom is stepped with seven positions from wide to telephoto, so precise framing is going to mean some moving backwards and forwards.
In common with most high-spec compacts the A40 offers some manual exposure control, in the form of shutter priority or full manual modes. The only available aperture settings in manual exposure mode are minimum and maximum (f/8.0-f/15.4), although shutter speeds from four seconds to 1/2000th of a second are available in 1/3EV increments, so there is some room for creativity. The menu does also offer some degree of picture control, with adjustable contrast, saturation and sharpness, but there is no control over noise reduction. It does offer some other creative features though, including multiple exposures on the same frame, and a wide range of scene modes.
The Dynamic Range Adjustment feature is similar in function to Sony's DRO system. It proportionally increases the sensor gain in darker areas and reduces in in highlights, reducing the occurrence of black featureless shadows and burned-out highlights in high contrast shots. It has four settings; off, weak, strong and automatic. I found that it didn't do much about the highlights, but was able to pull out about a stop and a half of extra shadow detail without significantly increasing image noise, which should go some way towards alleviating the inherent dynamic range limitations of the 12MP 1/1.8-inch sensor.

Pentax's moving-sensor image stabilisation system is well-proven, and I found I was able to take sharp hand-held shots at full zoom at 1/25th of a second, a gain of about two and a half stops. This is approximately the same performance and Panasonic, Canon and Sony's optical image stabilisation systems.
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Danni said on 18th August 2009
Catherine Bradshaw said on 25th August 2009
I bought a Pentax Optio A40 from Comet on the 28/12/08 at a discounted price of £89.99. I was extremely pleased with my 'bargain' purchase and had been very happy with it up ... more
Andrew Smith said on 25th August 2009
I had exactly the same experience as the above - ie one day the camera was fine - the next the screen had gone - except it has happened to me twice. I had bought the camera from J... more
Andrew Smith said on 8th November 2009
Full marks to Jacobs, who after some correspondence got onto Pentax who repaired the camera without further charge. So I'm now using it again - still a great camera, pity about th... more
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Goodness, I found this page while searching to find an exact replacement for my Optio A40 in advance of claiming through my house insurance for accidental damage!
I bought m... more