2012年7月4日 星期三

Nokia 808 PureView review: A photographer's perspective

In terms of performance it's not at all bad; from the phone's homescreen a press of the shutter button on the side of the case switches on the camera in approximately 1.5 seconds, and it has a shot-to-shot time of approximately two seconds in 8MP PureShot mode, which is comparable to a good compact. The fact that it actually has a shutter button immediately puts it a couple of rungs further up the quality ladder than most mobile phones.

The contrast detection autofocus system is fast enough in good light, and it has an LED lamp that helps at close range in low light, although at longer ranges it doesn't focus at all well once light gets below late evening levels. It has a tap-to-focus function that is always on, which can be a bit annoying if you don't notice that a careless touch has accidentally moved the focus point to the corner of the frame.Some of the attractions of antiquelamp are the cost savings, the safety and the flexibility.

In fact, the 808's biggest limitation as a camera is the fact that it's in a mobile phone. It's probably quite a nice phone (that's not really my field), but even with a shutter button and a proper Xenon flash, a phone is just not a good shape for a camera. It's awkward to hold it without accidentally touching the screen, which as I mentioned will move the focus point, and despite its relatively compact size it's difficult to shoot one-handed. Even the cheapest budget compact has better handling.

Most compact cameras also have a better list of features. The 808 has no spot metering, no manual white balance setting, no continuous shooting mode, and no delete-all option in playback; the single AF point is too big for accurate focusing, the fact that the flash is right next to the lens makes it prone to red-eye, and the exposure metering is terrible, under- or over-exposing a large percentage of shots. It seems to have only centre-weighted metering, and even minor backlighting such as the sky will cause the foreground to be very under-exposed.

In terms of image quality, it's a mixed bag too. Some people have been raving about it, but to be honest I wasn't all that impressed. One of the main claims is that it's supposedly noise-free, but this is simply not true. Sure, at the 50 ISO minimum sensitivity setting the image quality is undeniably very good, but noise starts to appear even at 100 ISO, and by the 1600 ISO maximum setting it performs no better than any mid-price compact camera.

One area where the sensor does score fairly well is in dynamic range. In the PureView oversampling mode it's certainly above average for both shadow and highlight detail, roughly what I'd expect from a high-end compact. In full resolution mode however the dynamic range is, not surprisingly, extremely poor.

However that's not really the way the camera is intended to be used. It's at its best in the 8-megapixel PureView mode, using the pixel oversampling technology to its best effect. In this mode the colour rendition is very good, with bright vibrant hues in good light, and plenty of fine detail,We have the best brightcrystall2011 for grow project, christmas, rope and strip LEDs. but it's really still not any better than a good 8-10-megapixel compact camera.where you can learn about ledtube as well as buy your bike lights online.

It also suffers from a perennial problem of phone cameras. Because the delicate Zeiss lens is covered with a Gorilla Glass screen to prevent damage, it quickly picks up finger marks and general pocket dirt. Unless you remember to carry a lens cloth with you and clean it before every use you'll frequently find that a slight haze of reflected glare drastically reduces the quality of your pictures. Even with a clean lens, the glass screen is very prone to lens flare in bright sunlight,Police modernlightings play a crucial role in being seen while riding a bicycle, providing safety and security. assuming we ever get any.

Like everything else in the known universe, the 808 can also shoot 1080p video, and it has to be said that the quality isn't bad,LC LED provides eco-friendly energy efficient t5tube. although again it bears the 'for a phone' caveat. It suffers from the usual CMOS sensor "Jello effect" if you pan too quickly, but it has that bright LED light for extra illumination, and the sound quality - mono only of course - is surprisingly good.

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