http://www.trustedreviews.com/digital-cameras/review/2007/10/12/Pentax-Optio-E40/p1 | Author | Cliff Smith |
| Published | 12th October 2007 |
| Manufacturer | Pentax |
| Price | £76.60 (Exc VAT) |
| as reviewed | £90.00 (Inc VAT) |
| Latest Price |
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| Features |  |
| Image Quality |  |
| Value |  |
| Overall | |
Back in April I reviewed the then-new Pentax Optio E30 a couple of weeks after reviewing a fairly similar budget compact from Nikon, the Coolpix L10. This week I'm taking a look at the new Pentax Optio E40, just a week after I reviewed the Nikon Coolpix L11. It's interesting to see just how similar the two cameras are, although perhaps not too surprising, since they are both entry-level point-and-shoot compact cameras running on two AA batteries.
There are very few 8-megapixel cameras available for under £100. The E40's only competitors are the Fujifilm FinePix A820 and the Samsung S85, both of which are currently selling for around £99. Since the Optio E40 is currently available for around £90 it undercuts even these two bargain-basement models. Of course £90 doesn't buy you a whole lot of camera, but despite that the E40 is surprisingly well specified. It has an 8.1-megapixel sensor, 3x optical zoom lens and a 2.4-inch monitor, as well as face detection AF and 30fps VGA video mode.
While the Optio E40 is clearly a development from the E30, it is not simply a case of a new sensor in an old camera. It has a completely new body, and more importantly a new lens as well, which might go some way to improving on the E30's rather disappointing image quality. It's still a 3x zoom lens, but the zoom range is now equivalent to 37.5-112.5mm, rather than the 36-108mm range of the earlier model. It is also slightly slower, with a maximum aperture of f/3.8-5.6 instead of f/2.7-4.8. While both of these factors would seem to be a step backwards, it's the overall optical quality that's important. We'll come back to that later.
The body is still plastic of course, but it is very strong with no creaks of flexing even when squeezed hard. It is a lot more attractive than the previous model, and looks more expensive than it is. It's much slimmer than the E30, measuring approximately 28mm at the thickest point, which isn't bad for a camera powered by AA batteries. The thicker right-hand end makes the camera very comfortable to hold, and the raised detail on the front panel works to some extent as a finger grip. The loose battery hatch problem from the E30 has been solved, and the new cover has a strong metal hinge and closes securely. All in all the design, build quality and handling are very impressive for a budget camera.
With the new sensor comes a higher maximum ISO setting, up from 400 to 1000, but some of the camera's other features are identical to the E30. The monitor screen is still a bit of a weak point, and appears to be the same 110,000-pixel unit from the E30. It's a bit dim and lacking in contrast by recent standards, and the refresh rate could be a bit quicker, but it does the job - just. Several other features are also unchanged from the E30, as a glance at the virtually identical controls will reveal, but then these are features that are common to most of Pentax's compact cameras. It has the useful Auto Picture mode, which automatically selects the appropriate scene mode for the type of picture being taken, as well as manual selection of program exposure, night scene and ten other scene modes, including the inevitable frame composite mode, panorama stitching and a high-ISO anti-shake mode.
As well as this, the menu options include wide area, spot and continuous AF, exposure compensation, and adjustable sharpness, saturation and contrast. The D-pad buttons control a two- or ten-second self timer, continuous shooting, 16-shot burst mode, several focus modes including macro, landscape, pan focus and even manual focus, and the usual selection of flash modes. It's not an extensive list of features, but it is more than most low-cost digital cameras offer.
Where the E40 does start to reveal its limitations is in overall performance. It takes nearly five seconds to start up, although it shuts down rather faster in just over two seconds. Shot-to-shot time is under two seconds for the first three or four shots, but then slows down noticeably as the image buffer fills up and has to wait until it has written to the memory card. Even using a high-speed SanDisk Ultra II SD card the average shot-to-shot time over ten shots was nearly four seconds. Likewise in continuous shooting mode it shoots the first three shots in under two seconds, but then slows right down to one shot every four seconds for subsequent exposures, and annoyingly the monitor screen remains black as long as the shutter is held down.
As with most low-end Pentax models, the autofocus system is quite slow, taking over a second to lock on in good light, and even longer in dim light. However the E40 is equipped with an AF assist lamp, and while low light focusing may be slow it is at least reliable, and will work in total darkness at a range of several metres. Other performance criteria are also adequate, including flash range, which is an excellent 4.3m at normal ISO settings, and the movie mode, which is slightly improved from the E30, and now offers a full 30fps at 640x480 resolution. Battery life also seems to be good, although as always with AA-powered cameras the actual performance will depend on the quality of the batteries used. Using the two standard alkaline batteries that were supplied with the camera I was able to take over 100 shots before the battery level indicator changed from three bars to two.
Picture quality is much improved over the E30, although it is still not without its problems, some of them quite serious. Exposure and colour rendition are better, and dynamic range is also good, especially with highlight detail, something that was a weak spot for the E30, however I found image noise to be a major problem at all ISO settings, even the minimum of 80 ISO. There was visible image noise in the darker areas of every shot, which robbed the images of a lot of fine detail and introduced colour irregularities. This is doubly annoying, because the new lens appears to be significantly better than the old one, with good edge-to-edge sharpness, no chromatic aberration and relatively little barrel distortion at the wide-angle end. However I did also notice some slight vignetting, with the corners of some wide-angle shots noticeably darker than the centre of the frame.
Verdict For a rock-bottom price the Pentax Optio E40 offers good build quality, elegant design and a surprisingly complete set of features. Performance is a bit on the slow side, but it will reliably take usable pictures in most lighting conditions. Where it falls down however is on final image quality, with noise problems at all ISO settings, and vignetting is also an issue.
Over the next few pages we show a range of test shots. On this page the full size image at the minimum and maximum ISO settings have been reduced to let you see the full image, and a series of full resolution crops have taken from original images at a range of ISO settings to show the overall image quality.
This is the full frame at the minimum ISO setting.
If you look at the upper part of this shot, you'll see image noise even at the ISO 80 setting.
Noise is noticeably worse at ISO 160.
Progressively more noise at ISO 320.
Not much worse at ISO 400, but then it's only 1/3rd of a stop higher.
A sudden dip in quality at ISO 800.
At ISO 1000 the image quality is very poor.
This is the full frame at the maximum ISO setting.
A range of general test shots are shown over the next two pages. In some cases, the full size image has been reduced for bandwidth purposes, and a crop taken from the original full resolution image has been placed below it to show the overall image quality. Some other pictures may be clicked to view the original full-size image.
Click to enlarge Here's my usual detail test shot of the West Window of Exeter Cathedral, for you to compare with other cameras. See below for a full res crop, or click to see the whole picture.
The new lens provides good detail, but it is swallowed up by the image noise even in this low-ISO shot.
The lens produces some barrel distortion at wide angle, but it's not too horrible.
Centre sharpness is good, but again image noise is visible in the darker areas.
Edge sharpness is also very good, with no chromatic aberration.
A range of general test shots are shown over the next two pages. In some cases, the full size image has been reduced for bandwidth purposes, and a crop taken from the original full resolution image has been placed below it to show the overall image quality. Some other pictures may be clicked to view the original full-size image.
Click to enlarge The wide-angle end of the zoom range is equivalent to 37.5mm, which is not very wide at all.
Click to enlarge The telephoto end of the zoom range is equivalent to 112.5mm, but at least the dynamic range is pretty good.
Colour rendition is very good, but the corners of the frame are a bit dark.
Contrast and dynamic range are also good, with both shadow and highlight detail in this high-contrast shot.
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Optio E40相机采用了先进的脸部识别自动对焦和自动曝光功能，可以自动探测到拍摄对象脸部的位置和光照条件，使对焦以及曝光设置达到最佳。因此，您能始终以精确的对焦和完美的曝光来捕捉拍摄对象的笑脸，并能再现平滑、自然的肤色。
当Optio E40探测到光照条件不佳时，它的数码SR系统会将其感光度自动调高，以设定一个更高的快门速度。即使在舞台光线昏暗、相机容易抖动以及拍摄对象经常移动的情况下，仍然可以拍摄到清晰、明亮的图像（如孩子的舞台表演）。
当用户将Optio E40设定为自动图片模式时，相机能自动为拍摄的对象或者场景选择最佳的拍摄模式。采用该项用户友好模式，您只需按动快门即能一张接着一张地拍摄清晰、漂亮的图像。
Optio E40采用世界标准的AA电池供电，几乎在任何地方都能方便地买到更换的电池。使用一对全新的AA锂离子电池可拍摄约640张图像*，而一对全新的AA碱性电池可拍摄大约240张图像*。
通过附带的USB接线将Optio E40连接至兼容PictBridge的打印机后，您就可以方便地直接打印图像了，而无需再将图像数据传输到电脑。任何兼容PictBridge的打印机都可以直接打印，不受生产厂家和型号的限制。
兼容Exif Print、PRINT Image Matching和DPOF格式
通过附带的AV接线将Optio E40连接至电视机后，您就可以在较大的屏幕上播放拍摄的图像和有声动画，与家人和朋友一起享受观赏影像的乐趣。
使用附带的USB接线，您可以轻松地将Optio E40拍摄的图像传输至PC，用来张贴在网站或电子相册中。
Optio E40附带ACDSee for PENTAX软件（在附带的光盘中），用于在电脑上对拍摄的图像进行浏览和归档。Windows版具有众多图像编辑功能，包括亮度和色彩控制以及特效，可制作出精美独创的图像。