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.
On the camera's front, there's a video light and covered microphone jack; the built-in 5.1 surround mic sits on top of the lens, in front of the covered accessory shoe. Adjacent to the lens is a sliding switch that toggles between Auto and manual focus/zoom. The latter works in conjunction with a servoelectronic zoom ring on the lens. Another button there offers selections of white balance, shutter speed, and iris controls--you then cycle through each of their options using the ring. So, for example, to adjust shutter speed you press the button (which is fairly difficult to press), rotate the ring to select shutter speed, press the button again, then rotate the ring to choose the specific speed. This is similar to the way Sony and Canon's models operate, though they have a separate dial.
While I generally like the ring--it feels smooth and responsive, though it does operate in the infinite circle which makes servoelectronic controls annoying--it can get confusing jumping back and forth between manual focus, manual zoom, shutter speed, iris, and so on all on that single control. I tried to zoom, only to discover I was accidentally changing the white balance. I usually like joysticks, but I had mixed feelings about this one. As with the older HDC-SD9, the joystick is in an especially odd place that requires some getting used to; for instance, pressing the joystick toward you produces the same result as moving it to the right in a traditional orientation, while pressing it away will navigate to the left. It's also fairly recessed, making it a bit hard to manipulate precisely.