Panasonic wisely halved the price of its formerly top-of-the-line twin AVCHD camcorders, the hard-drive-based Panasonic HDC-HS100 and flash-based HDC-SD100, after they'd only been on the market for about six months. Though they provide a decent manual feature set and a trio of CMOS chips, they simply don't deliver the video quality you expect from models that cost more than $1,000. Even at their lower, sub-$600 prices, they still have trouble competing.
The two incorporate the same optical and capture systems, including 3 1/6-inch MOS chips with effective video resolutions of 520,000 pixels each and a 12x f1.8-2.8 zoom lens. The HS100 records to a 60GB hard disk or optional SDHC card, while the SD100 is SDHC only. Because of the different media, the camcorders have slightly different designs, but the same feature sets and should have identical video quality. The highest video quality they offer is 1,920x1,080-pixel resolution at 30fps at 17 megabits per second, and can record about 7.5 minutes of video per gigabyte of storage space or approximately 7.5 hours of video on the hard disk. The next level down, 13Mbps, gets about 10 minutes per gigabyte.
Because of the hard drive, the HS100 is bigger and heavier: slightly more than a pound with dimensions of 2.9 inches wide by 2.9 inches tall by 5.4 inches long. It's comfortable to hold, especially with the extra ridge provided by the drive. One of the nicest aspects of the camcorder is that it retains an EVF, a feature that many manufacturers are dropping. I also like that there's a toggle switch next to it for jumping between it and the LCD; normally, camcorders automatically turn on the LCD when you open it.
Of course, Panasonic had to provide a switch because so many of the controls live inside the LCD recess. These include the menu button, navigation joystick, and optical image stabilization button. Above them, outside the cavity, are the Intelligent Auto and 3-second prerecord; below, under hard covers, are the component video out connector, headphone jack, and SD card slot. One of the most irritating aspects of the camcorder's design is the placement of the USB and HDMI connectors behind the battery. Since you actually have to remove the battery to use them, you also have to plug the camcorder into the AC adapter. While I can somewhat understand forcing users to run on AC power while downloading video, it's not necessary for connecting to a TV.