Panasonic's trio of top-of-the-prosumer-line HD camcorders--the flash-based HDC-TM300, and hard-drive-based HDC-HS300 and --in many ways vastly improve over older models like the HS100 and SD100. Panasonic jettisoned most of what I disliked about those models, including the too-low-resolution CMOS sensors, connector placement, and how the manual controls function, and retained everything I liked, notably the breadth of manual controls and eye-level viewfinder, at least on the two highest-end models. While the company replaced the awkward ring-based manual operation with an equally awkward touch screen, the improvement in video quality and performance make these a far better bet.
The three models incorporate the same 12x zoom f1.8-2.8 lens--the same lens as the HS100/SD100--as well as the same trio of 1/4.1-inch 3-megapixel 3MOS sensors, with an effective resolution of 2.07-megapixels each for 16:9 video. The real 3-megapixels for the predownsampled AVCHD video finally breaks the resolution barrier; normally, 3-chip systems use lower-than-HD resolution sensors, which don't seem to produce terribly sharp HD video. Because of the different media, the camcorders have slightly different designs, but the same feature sets and should have identical video quality. (As such, for the purposes of this review, we ran our standard video tests on only the TM300.) The highest video quality they offer is 1,920x1,080-pixel resolution at 30 frames per second at 17 megabits per second, and can record about 8 minutes of video per gigabyte of storage space, or approximately 4 hours of video in the internal memory. The next level down, 13Mbps, gets about 10 minutes per gigabyte.
The TM300 and HS300 share the same higher-end features as the HS100--manual focus ring, EVF, accessory shoe, and microphone input--while the HS250 trades those for a more compact design. Both the HS250 and HS300 have a 120GB hard disk. As the name indicates, the TM300 is analogous to the HS300, but records to SD cards or the built-in 32GB memory. They all include the optical image stabilization and Intelligent Automatic features of the older versions.
Weighing just less than a pound, with dimensions of 2.8 inches wide by 2.8 inches high by 5.5 inches long, the TM300 is the lightest, though not the smallest, of the three and is larger than competitors like the Canon Vixia HF S10. It's comfortable to hold, especially with the slight upward curve toward the back that makes the zoom switch and photo button easier to reach. The earlier models had a toggle to switch between the LCD and EVF; with this one, you pull out the EVF to enable it, which is a nicer and more utilitarian design.
In contrast to the older models, only the optical image stabilizer button lives inside the LCD recess, and most of the controls have been replaced by a hybrid button/touch-screen interface. Within the recess, under hard covers, are all but one connector--AV, component video out, mini HDMI, and USB--and the SD card slot. (Panasonic recommends a Class 4 card.) In an interesting design move, Panasonic added an accessory shoe to the TM300, but put it in the side rather than the top--a more practical location given how far your hand covers the top. Mic and headphone jacks are on the front right side, beneath the flash and adjacent to the shoe.