Design
The CP120 is small and light — in fact, BenQ claims that this at 1.3kg projector is the smallest wireless projector in the world. Even so, it feels solid and robust. There is a built-in lens cover that slides aside easily, and a well-made front tilt leg that slides out smoothly at the touch of a button. This is much better designed than the tilt mechanisms on some other projectors.
The projector can take input from S-Video, composite video or analogue monitor connectors, as well as a wireless option we'll look at later. It also has a USB port to connect to the PC, allowing the remote — a thin, basic unit that does its job well — to be used for navigating through presentations.
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Like most portable projectors, the CP120 uses Texas Instruments' DLP technology. A 132W user-replaceable lamp gives a nice brightness of 1500 ANSI lumens, which is more than some in its class. The resolution is 1,024 by 768 (XGA), the contrast is rated at 2000:1 and the lens is by Carl Zeiss.
Subjectively, the colour is good, and the image both strong and stable, while focus is easily managed. The keystone adjustment is easy to understand and operate, with an automatic real-time keystoning feature. The projector has a nice quick-cool feature, which lets you unplug it 30 seconds after your presentation is finished, without damaging the bulb.
The CP120 comes to life reasonably quickly after you switch it on, searching briefly for inputs before settling on what's offered. We find that monitor output is usually the easiest way to drive a projector, and this works fine, but we did try the wireless option.
Why Wi-Fi?
Wireless connections on projectors are often rather more hassle than they are worth, and the CP120 is a case in point. That's no fault of BenQ; it's simply that Wi-Fi isn't a great medium to use to connect a projector to a PC -- especially one that's on the road and may be in a room flooded with Wi-Fi signals. If you're travelling with a notebook and a projector, the monitor cable isn't much extra to carry, and BenQ gives you another suede-ish zipped bag to put it in, along with the projector's power cable.
BenQ's wireless mode uses a client installed on the notebook, and this crashed regularly, possibly due to conflicts with other wireless software. The projector must be put into wireless mode and the client launched. Then it's a matter of pairing up on both the projector and the notebook.
We can't see many people going through that hassle, just to get a link that doesn't have the bandwidth to handle video or other fast-moving content. Luckily, Wi-Fi is widespread enough that it hasn't bumped the CP120's price up too much.
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