A Field Test Of Panasonic’s Lumix DMC-FZ8 And DMC-TZ3

Len Porcano | Aug 28, 2007

On vacation trips in the US, France, and Canada over a six-month period, I often left my D-SLR system behind and carried only two Panasonic digicams: the Lumix DMC-FZ8 with a 12x zoom and the very compact DMC-TZ3 with a 10x zoom lens. Like nearly all other tourists, I did not carry a tripod. Hence, I was particularly interested in digicam features intended for sharp, blur-free images of all types of subjects in a broad range of conditions. The Lumix models are well equipped in that respect, but that's true for some digicams of other brands as well. Thus, this report is not specifically a review of the two Lumix models but an evaluation of specific features that should be attractive to everyone.

While the lowest ISO level produces the finest image quality with any camera, higher ISO levels can be useful in low light for faster shutter speeds to prevent blurring caused by camera shake or subject movement. Most digital cameras provide both manual and automatic ISO control options each with their own pros and cons. (Image made with the Lumix DMC-FZ8 at ISO 400.)
All Photos © 2007, Peter K. Burian, All Rights Reserved

Compensating For Camera Shake
The most common cause of blurry pictures, camera shake is produced by our natural hand and body tremors. The effect is aggravated when using a telephoto lens that amplifies even the slightest shake while magnifying the subject. And of course, blur can also be caused by subject movement, whether the motion of an athlete or flowers swaying in a breeze. The solution to both problems is simple: shoot at a fast shutter speed. That can often call for a higher ISO level, particularly on dark overcast days or indoors, while touring cathedrals, castles, and museums, for example.

Virtually all of the recent digicams include at least two ISO Selection modes, and some are equipped with at least one additional option. Let's consider each of these and the benefits they can provide.

Higher ISO Levels: Most of the digicams that I tested over the past five years provided no ISO level higher than ISO 400. That was understandable, because at higher ISO levels, digital noise--a grainy effect, with mottled color specks--would have seriously degraded image quality. The reason is simple: A digicam's CCD sensor is very small, so the pixels are smaller than you find in a D-SLR chip. Hence, they're not very sensitive to light, making "analog gain" necessary to amplify the signal--that's what causes more obvious digital noise.

Over the past year or two, all of the manufacturers have solved that problem to some extent with somewhat improved sensors and greatly enhanced processing engines using incredibly sophisticated Noise Reduction algorithms. That combination has made ISO 800, 1250, and even 1600 readily available. While image quality is still best at a low ISO, it's great to have the option of selecting a high ISO when fast shutter speeds are required for low-light or action photography. For instance, both of the 7-megapixel Lumix cameras that I tested provide a full range of selectable levels from ISO 100-1250, giving the user plenty of versatility.

For "Higher ISO Levels" section under "Compensating For Camera Shake."
The exact appearance of high ISO digital noise differs from one camera to another but typically it's exemplified by a grainy effect and mottled color specks that are most visible in mid-tone areas. Resolution of fine detail is also lower than at low ISO and "smearing" of details is often visible, caused by Noise Reduction processing that uses blurring to produce a smooth (not grainy) overall effect. That's why it's best to shoot at lower ISO levels when that's possible while making sharp images. (Image made at ISO 1250 for illustration of digital noise.)

Much higher ISO levels are listed in some digicams' specifications charts. For example, the Lumix models claim an ISO 3200 option but a footnote indicates that it's available only in a special High Sensitivity Program mode at 3-megapixel resolution. (A few cameras do offer ISO levels above 1600 at full resolution.) It's worth being aware of any limitation at ultrahigh ISO selection, although it's not really a drawback, in my view. A 3-megapixel image is adequate for 5x7" prints, the uppermost size limit for fine quality at ultrahigh ISO regardless of the resolution.

Note: Although a camera's default level for high ISO Noise Reduction (NR) should work well, a few cameras, like the Lumix models that I tested, provide other NR levels. At high ISO levels, the Low NR option produces images with maximum resolution of detail but with a grainy, mottled effect. The High NR option may sound more useful, and it does produce smoother images, but the processor employs greater blurring, causing a somewhat "plasticky" effect due to smearing of fine details.

Auto ISO: A common feature these days, Auto ISO allows the camera to automatically set a "suitable" ISO level at full resolution, as required by the lighting conditions. This feature is usually standard in the fully automatic Scene modes; some cameras (like the Lumix models) provide Auto ISO in other operating modes as well. Typically, these automated systems are programmed with a logical goal: Set the ISO that's necessary to provide an adequately fast shutter speed to prevent blurring caused by camera shake. As you would expect, that means a low ISO on bright days, and a progressively higher ISO as the light level drops. I found this to be useful while touring castles and the Louvre Museum where the light level differed from room to room. It was also valuable while shooting a theatrical performance where the level of illumination changed frequently.

An Auto ISO mode can be particularly useful in situations where the light is changing rapidly or when moving from bright to dark areas inside a building, such as the castles that I toured in France. By leaving ISO control to the Lumix camera, I could shoot quickly while concentrating on other aspects such as composition without worrying about blur from camera shake. (Image made with the Lumix DMC-TZ3 at Versailles in Paris.)

Intelligent ISO Control: Now available with all current Panasonic Lumix cameras, and some of the latest Casio digicams, this feature provides evidence of thoughtful engineering. Each company uses its own technology, but basically, the cameras' processors include a motion detection circuitry that determines when a subject is moving and at what speed. If motion is detected, the camera automatically boosts the ISO level; the Lumix cameras allow the user to specify the highest ISO level that should be used. While Intelligent ISO mode will set a higher ISO in any low-light shooting, it's most valuable in action photography.

Unique to Panasonic and Casio at the time of this writing, an Intelligent ISO mode can be useful when shooting sports or other action. The camera's processor calculates subject speed and the shutter speed that's likely to prevent motion blur and sets a suitable ISO level for sharp photos. That varies depending on the exact conditions of course, as indicated by these diverse images. (Images made with the Lumix DMC-FZ8 using Continuous Autofocus, in Intelligent ISO mode.)

Since I often photograph cars, cyclists, horses, and other action, I was particularly pleased to discover this Program mode when testing the Lumix DMC-FZ8 and DMC-TZ3. (Both cameras also provide a remarkably effective Continuous Autofocus feature that also made it easy to get properly focused action shots.) As expected, the faster a subject was moving, the higher the ISO level that was set by the "intelligent" system, such as ISO 400 on dark days or ISO 1250 during a hockey game inside an arena. Although Intelligent ISO with motion detection is available only in a single, fully automatic Program mode, I found it to be very useful. In about 75 percent of my tests, the system allowed the camera to set an adequately fast shutter speed to freeze subject motion.

While electronic flash can minimize the need for high ISO levels (for fast shutter speeds), the range of a small flash unit is not great and the extra burst of light can destroy the atmosphere of a scene. Those aspects make high ISO levels useful in low-light photography when touring without a tripod. (Image made with the Lumix DMC-TZ3 at ISO 1250, at a 200mm equivalent at 1/60 sec, handheld, with Image Stabilizer Mode 2 activated.)

Minimizing High ISO Levels
As discussed earlier, every digital camera produces better image quality at a low ISO than a high ISO level. That's one reason why serious photographers use a rigid tripod for landscape photography, for example. Even when shooting at small apertures, when the shutter speed may be 1/8 sec at ISO 100, they do not need to worry about blurry photos. Unless the subject is moving, the tripod will ensure sharp images.

A three-legged accessory is great in many respects, but most folks prefer not to drag one along when shooting people, places, and events. It's cumbersome and can get in the way of others; for that reason, a tripod is prohibited in many popular locations. As well, that accessory is of no great value when you want sharp photos of moving subjects; a fast shutter speed is still required to "freeze" motion. And that will call for a higher ISO level unless the camera is equipped with one or both of the following features.

Image Stabilizer: An increasing number of digicams (in nearly every brand) now incorporate some stabilizing mechanism that compensates for camera shake by shifting optical elements. This feature may be identified with the term Anti-Shake, Optical Stabilizer, Vibration Reduction, Super Steady Shot, or some similar term. Panasonic uses their own MEGA OIS system, now available in all current Lumix models. Any effective technology can provide sharp photos at moderately long shutter speeds in handheld shooting, reducing the need for high ISO levels that can degrade image quality.

On average, an Optical Image Stabilizer provides at least a two shutter speed step advantage. Each manufacturer uses its own technology so the effectiveness of a stabilizer can vary; as well, some shooters are simply steadier than others. When using Panasonic's highly-rated MEGA OIS system, I selected Mode 2: "Shoot-only," activated a split second before a photo is made. This was the most effective in terms of the stabilization, providing roughly a three shutter speed step advantage.

By compensating for camera shake, it enabled me to shoot at a 280mm equivalent focal length at a 1/45 sec shutter speed instead of the 1/300 sec required with non-stabilized cameras. When using a 50mm equivalent zoom setting, I was able to consistently get sharp photos at a 1/8 sec shutter speed. Bracing the camera against some firm support allowed for sharp photos at even longer shutter speeds. That further minimized the need for ultrahigh ISO in some very dark locations, ensuring that my images were cleaner, with less digital noise.

Note: Many cameras--including models from companies that also make digicams with a true stabilizer--feature another type of system. This may be an automatic "ISO boost" feature or some electronic anti-blur sharpening. While that amenity may be labeled with some form of the term "stabilization" or "Anti-Shake," neither is a true stabilizing mechanism. When considering a digicam, be sure to check the manufacturer's website carefully to determine whether it's actually equipped with a true Optical Image Stabilizer.

Here's the bottom line on the benefit provided by the Panasonic Mega OIS system: in handheld shooting, both Lumix cameras produced sharp images at much longer shutter speeds than a conventional camera. The system was smooth and quiet and it did not slow performance in any way. Even with the stabilizer on, I was able to shoot a series of five full resolution JPEGs at a blazing 3 frames per second. The only drawback? Any Optical Stabilizer consumes extra power; even so, I was able to shoot all day without recharging the battery in either camera.

Wide Aperture Lens: Any lens with very wide maximum apertures is described as "fast" because it transmits more light to the sensor, allowing the camera to set a faster shutter speed. That reduces the need for high ISO levels, useful whether the subject is static or moving. Combined with an Image Stabilizer, a fast lens is particularly valuable when shooting at long telephoto focal lengths, increasing the odds of sharp photos that are not blurred by camera shake.

For example, the Lumix DMC-FZ8 is equipped with a Leica 36-432mm zoom with unusually wide maximum apertures of f/2.8-3.1. That's impressive when compared to the much smaller maximum apertures such as f/3.5-5.5 (or similar) that are more common. The 28-280mm equivalent zoom in the DMC-TZ3 has maximum apertures of f/3.3-4.9, a bit wider than average, particularly at the long focal lengths, but it's not nearly as "fast."

The wide apertures available with some cameras' built-in zoom lenses can be useful in dark locations (or in action photography), allowing the user to shoot at a lower ISO level for superior image quality. Combine a wide aperture lens with an effective Image Stabilizer system and you'll be pleasantly surprised at the benefits provided by the two features. (Image made with the Lumix DMC-FZ8 at f/2.8 with Optical Image Stabilizer, using a 1/8 sec shutter speed and ISO 800, at a 42mm equivalent focal length.)

Any "faster" lens transmits more light to a camera's sensor. While shooting with the DMC-FZ8, ISO 100 was fine for most outdoor travel photography. The MEGA OIS stabilizer was necessary only when I wanted to shoot at small apertures, for greater depth of field (range of acceptable sharpness). On dark, heavily overcast days in France, I needed to boost the ISO, but only to ISO 200 when I wanted fast shutter speeds. By comparison, the "slower" lens in the DMC-TZ3 required me to use ISO 200 on cloudy days and ISO 400 in dark, overcast conditions, producing images with more digital noise.

Note: As experienced photographers know, there's not much value in a "fast" lens if it cannot produce fine image quality at a very wide aperture. That's not an issue with the Panasonic Lumix DMC-FZ8 because its Leica DC Vario-Elmarit 36-432mm equivalent zoom includes three aspherical elements for great control of optical aberrations. All camera companies make some models with high-grade lenses and that is an important aspect when choosing a digicam for serious shooting. When considering several models, read the manufacturers' comments about lens design aspects; also check for any published reviews that discuss optical performance.

Final Evaluation
After this lengthy discussion about shutter speed and ISO issues, let's take a look at the level of image quality provided by the Lumix cameras. (Both employ the same sensor and processor and a lens of similar quality.) My ISO 100 and 200 images exhibit a fine, tight grain pattern and high resolution, suitable for 12x16" prints that look gorgeous when matted and framed. Even ISO 400 made for outstanding 8.5x11" glossies and very good 12x16" prints. As with any digicam, the best results were produced by images that were well exposed or made in Raw Capture mode. While ISO 800 images exhibit a more obvious noise pattern and slightly lower definition of fine detail, they still made for very good letter-sized prints. Surprisingly, in the inkjet outputs--made with an Epson Stylus Photo 1400--there's not nearly as much visible "graininess" as in the images displayed on a computer monitor. As expected, ISO 1250 was less impressive, but still produced very nice 5x7" prints; even letter-sized prints from my technically best images are sharp, though grainy. On the other hand, I didn't often need such a high ISO level thanks to the MEGA OIS stabilizer.

In more general respects, these are both very fast, reliable, and remarkably well equipped cameras, particularly the DMC-FZ8. The combination of Optical Image Stabilizer, Intelligent ISO mode, user-adjustable Noise Reduction, Leica zoom lens, and a superior autofocus system maximize the odds of sharp photos in both low-light and action photography. Attractively priced, the Panasonic Lumix DMC-FZ8 and DMC-TZ3 offer excellent value considering their versatility, advanced technology, great speed, and potential for fine image quality.

The average street price for both models is $319 each.

For more information, contact Panasonic, One Panasonic Way, Secaucus, NJ 07094; (800) 211-7262; www.panasonic.com.

A long-time "Shutterbug" contributor, Peter K. Burian (www.peterkburian.com) is a free-lance stock photographer and the author of three recent books: "Mastering Digital Photography and Imaging," "Magic Lantern Guide to the Sony A-100," and "Magic Lantern Guide to the Pentax K10D." He is also a digital photography course instructor with BetterPhoto.com.