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Meras have an electronic viewfinder with 1,152,000 dot resolution. The EVF LCD is time-multiplexed -- that is to say, it shows each color in sequence at every pixel location, rather than the separate, adjacent color dots of most electronic viewfinders. This makes it harder to distinguish individual pixels. The Sony SLT-series cameras also sport a wide-aspect 3-inch LCD with 921,600-dot resolution. Rather than rest after establishing products in every major sector of the interchangeable lens digital camera market -- APS-C SLR, full-frame SLR, and most recently single-lens direct view -- Sony is boldly striking out to create yet another category with the launch of its very first translucent mirror cameras. Zte axon 7 cheap The main goal of the new design: achieving unprecedented autofocus and capture speed from an APS-C sensor, interchangeable-lens, consumer digital camera. Comprising a new SLT series, the Sony Alpha SLT-A33, A55, and A55V are closely related cameras sharing the same basic design, with only a few internal features as major differences. Although it lacks the reflex mirror of an SLR, having replaced it with a fixed translucent mirror, the basic shape of the Sony SLT-A33 still follows that of a traditional SLR fairly closely.

Removing the reflex mirror still provides potential for space and weight savings, and Sony has taken good advantage of this. The translucent mirror design also provides other opportunities to optimize component placement. As one example of this, Sony has increased the angle of the translucent mirror, so that instead of directing light directly upward at a 90 degree angle as it would for a viewfinder prism, it is actually angled upward and slightly forward, allowing the autofocus sensor to be moved forward, providing more room for the electronic viewfinder assembly directly to the rear. Losing the pentaprism and mirror drive motors helps the A33 achieve a smaller body size than SLRs. If the handgrip depth is ignored, the Sony A33 is actually just a little smaller than the smallest digital SLR to date, the Olympus E-420. While not quite as light as the Olympus E-420, which lacks an in-body image stabilization mechanism, the Sony Alpha SLT-A33 is certainly in the same ballpark.

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The A33 weighs 17. Thanks to its smaller body, and especially their reduced height due to the lack of a pentaprism or pentamirror assembly, the Sony A33 looks rather aggressive, with the popup flash housing hunched low over the top of the lens barrel. A soft, rubber pad surrounds most of the handgrip, and wraps around to the rear of the camera to cover a small, contoured thumb grip area as well. Due to its diminutive stature, most photographers will find that the grip only accommodates two fingers, with the index finger resting on the shutter release button above, and the little finger curling beneath the bottom of the camera.

This might seem a little crowded, but with the light, plastic-bodied 18-55mm kit lens, handling is nonetheless good, with the combination feeling extremely well balanced. Centered to the right of the lens in the photo above is the lens release button, while the depth-of-field preview button is positioned snugly at the bottom left corner of the lens mount. A small plastic panel in the handgrip conceals the infrared remote control sensor at top, and the self-timer lamp beneath.

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Directly beneath the shutter button and power switch is the control dial, used to make adjustments to exposure and variables and menu options. At the top of the handgrip is the popular combination of a shutter button surrounded by a power switch, making it easy to quickly power on the camera and snap a picture with one finger.

Upper right of this is a D-Range button that provides access to Dynamic Range Optimizer and High Dynamic Range shooting options. An angled panel allows you to view four buttons from either the rear or above: Menu, Movie, Exposure Compensation, and Auto-exposure Lock buttons.

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The viewfinder itself projects quite a bit from the rear of the camera, a decision that was apparently necessitated by the tight packaging of components in front, including the AF module, popup flash, hot shoe, and microphones. A positive side-effect of the EVF positioning is that it makes it easier to keep your nose from smudging the LCD panel. Given the relatively tight eyepoint of the electronic viewfinder, the projection also helps prevent the photographer having to jam the camera to their face to see the entire viewfinder display.

The display tilts down 180 degrees and then swivels 270 degrees, allowing it to face any direction except to the front right (handgrip) quadrant. It can also be difficult to deploy and use with the camera mounted on a tripod.

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The Xtra Fine LCD panel has a 921,600-dot resolution. Thanks again to the relatively short stature of the Sony A33, the remainder of the rear-panel controls are rather difficult to reach when shooting single-handed, even with the relatively light kit lens attached.

There are only a few buttons, Function, Playback, and Delete, plus a four-way controller with a central OK button. Undoubtedly the biggest story of the Sony SLT-series cameras is their use of a translucent mirror.

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Also known as pellicle mirror, this works by allowing most light to pass through to the imaging surface beneath, while a small portion is reflected for other purposes. Sony is not the first camera manufacturer to use a translucent mirror in an SLR-style camera, with the manual focus Canon Pellix film camera from 1965 taking that credit.

The Pellix was followed by a handful of other pellicle mirror-based SLRs from Canon, Nikon, and Mamiya, largely designed for professional photographers, and manufactured in very limited production runs. Fifteen years later, Sony has become the first company to resurrect the pellicle mirror for use in an interchangeable lens digital camera. There are several advantages to the use of a translucent mirror in place of a traditional single-lens reflex mirror mechanism.

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The Sony Alpha A33 uses the design to allow it to simultaneously provide a live view feed with full-time phase detection autofocus. Most of the light is transmitted to the image sensor, while a smaller portion is delivered to the phase detection AF sensor, where it can be used to perform focus adjustments -- even during live view, high-speed shooting, and movie recording.

While contrast-detection AF systems these days are much faster than they used to be, phase-detection AF generally still has the edge in terms of outright speed. It also involves less hunting around the point of focus, since phase-detection systems can determine both the focus direction and the required adjustment. The Sony A33 adopts a newly developed phase-detection autofocus sensor and lens module with 15 points, of which three are cross-type. AF points can be selected automatically or manually, and both predictive control (tracking) and face detection are included, although the cameras can only focus on detected faces if they fall under a phase detection point. As well as allowing full-time AF during live view and movie capture, the translucent mirror design of the Sony Alpha A33 brings another important advantage.

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During burst shooting with continuous autofocus, a traditional SLR has to drop its mirror between each frame, wait just long enough for any mirror vibration to settle, perform the AF measurement, and then raise the mirror again so that the next frame can be captured. For even swifter burst shooting, the aperture can be locked at either F3. The Sony A33 offers burst shooting at up to six frames per second ordinarily, but with the aperture locked in Continuous Priority AE shoots even faster, providing a very respectable seven frames per second.

This means that although the A55 will get you more shots in a burst, the A33 will be ready to start another burst much sooner. One quirk of the design of the Sony A33 (and shared by the A55) unfortunately conspires to make this high-speed