Source: Tom's Guide US | Keywords: hd, camcorder | Themes: Digital Cameras, Digital Entertainment
11. By Candlelight
Test 5 shows how the sensor performs with a single source of light, which here is a candle. The details of the racecar serve to check the focusing and the sensitivity of the sensor. We move the candle to check the sensor’s ability to handle changes in lighting. Should you take your camcorder with you on evenings out? See the results in video and HD photos with comments.
Canon
Once again the image shows superb contrast. The colors and details show up beautifully; the image quality is magnificent. The car shows up very well even when the flame moves. The autofocus remains in the center, and even with the candle moving, you have to look closely to see any faults (on the front wheel, for example). The sensor adapts gradually and perfectly to variations in light. Really excellent performance on this test. Hats off! Score 5.3/6
Sony
The image is good - the preciseness of the details is more than acceptable, but the colors are not always very true. We had a little trouble with the autofocus, which sometimes stayed stuck on the candle, but the sequence is fluid and supple overall, and so that wasn’t too much of a drawback. On the other hand, noise is visible, and the colors saturate with the variations of light. The racecar showed all possible variations of red (up to and including pink) when the light source was moved back. There is a NightShot mode, but it shoots only in infrared and so can’t really produce a precise image. Score: 4.1/6
Panasonic
The Panasonic was challenged by this test - we noted a lot of noise, and a tendency to produce a blurry image. The autofocus had difficulties, and when we moved the candle away, it went completely crazy. On the other hand, the sensor managed the variations in the light perfectly; much better than the Sony, for example. The Panasonic adapts to the changing light, but it does it abruptly, which makes for unpleasant viewing. Score 3.5/6
Hitachi
Ouch! More bad news. The picture is dark, blurry, and noisy. Artifacts appear next to the candle in the form of black lines. What’s more, an echo of the flame is discernible next to the image! On paper, this camcorder has the lowest sensitivity (24 LUX), and you can see it. As soon as the flame moves, the image becomes completely catastrophic, and when we move the candle, the image goes out of control and completely out of focus. Variations in light produce grainy images. The bottom line: a 0 for this test. Score: 0/6
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Be aware that there are some poorly-advertised issues with at least some of these cameras.
It is common practice for cameras with full 1920x1080 sensors to scale the images to 1440x1080 before compression.
Also, camcorders that record progressive frames at 24pf tend to store their data as if it were 60i (60 fields/sec, interlaced) by duplicating and reordering parts of the video data. Most applications (Ulead Video Studio, Sony Vegas, etc.) believe the video files when they say they're 60i, so they try to interpolate between shifted and reordered fields in a process called deinterlacing. This results in smoother images that are not as sharp as they could be and ghosting of fast-moving objects. Camcorders that record to 30pf or 30p should not have this problem.
Also, as mentioned in the article, it currently takes some special applications (like Video Studio or Vegas) and/or a bit of technical know-how to even be able to read the M2TS files many of these camcorders produce.
HD Camcorders are in their infancy at the consumer level. Expect lots of changes quickly right now. Even Pro HD cameras are changing quickly right now.
The Tomshardware image with the Bug:
http://media.bestofmicro.com/0/P/9 [...] nglish.jpg
More about Chroma Sampling Bug:
http://www.hometheaterhifi.com/vol [...] -2001.html