Digital SLR performance and features
As with standard digicams, digital SLR features and performance vary widely. These are some of the most important differentiators.
| Performance and feature criteria | |
|---|---|
| Resolution | Low end: 6 megapixels High end: 21 megapixels |
| Frame rate | Low end: about 1.5fps to 2fps High end: 10fps |
| Burst depth | Low end: 4 to 6 shots High end: 110 shots |
| AF speed and tracking | Hard to quantify, but there are wide gaps in the AF performance of current digital SLRs, especially when tracking moving subjects. The top-end sports and news pro cameras definitely outperform the rest. |
| Ruggedness | Also hard to quantify, but another area where a wide gap exists between low-end offerings and the midrange-to-top sports and news pro cameras, which are sealed against moisture and made with more durable materials. |
| Viewfinder coverage | Low end: 87 percent High end: 100 percent |
| Start-up, playback, and mode-switching times | Low end: 1- to 6-second delays High end: Virtually instantaneous |
| Viewfinder information | Varies widely. The more information you can see without taking your eye away from the viewfinder, the faster you can shoot. |
| Quality of auto white-balance system | None is perfect, but a good one saves lots of time and headaches for JPEG shooters. Those who shoot raw files have the option of correcting white balance with software after shooting. |
| Ergonomics | Impossible to quantify--and partly a matter of personal preference--but critical to efficient shooting. Our advice: try before you buy. |
| Image stabilization | Lens or body? With respect to the final photo produced, both work equally well. Optical stabilization has the advantage of letting you see the stabilized version while you're looking through the viewfinder, which can be crucial when framing at long focal lengths (beyond 300mm), but putting the technology in the lens generally results in more expensive lenses. On the other hand, mechanical (sensor-shift) stabilization will work with any lens you buy, making it a less-expensive long-run solution. |
| Video capture | An outgrowth of Live View mode, dSLRs are slowly adding video capture capabilities to their feature sets. This isn't yet a high-end/low-end differentiator among products, but it's unlikely we'll see it in the very cheapest of dSLRs. |
