Some concepts

To understand what’s so special about it, we must discuss first the fundamental difference between the DSLRs and compact cameras. Just in case you didn’t know, DSLR stands for “digital single lens reflex”. While you may think that DSLRs are about interchangeable lenses, they are actually defined by their mirror.

That mirror in front of the sensor redirects the light to the top prism and it also hosts the phase detection autofocus system (more about it in a minute). When a picture is taken, the mirror flips and the shutter opens. This whole system requires precision mechanics, is noisy and induces vibrations that cause problems when doing long exposures. Compact cameras on the other hand don’t have a shutter or a mirror; the sensor is continuously exposed to the light. Because there’s no mirror, compact cameras use contrast-detection autofocus.

So why is the the clunky mirror system preferred to the simpler compact one? The short answer is that phase detection is fast and contrast detection is slow.

Phase detection works with a beam splitter that redirects light rays from opposite sides on the AF sensor, where the intensity is evaluated relative to its position on the sensor. When both images have the intensity peaks on the same position, the image is in focus. If the position is different, the phase difference (the difference in patterns peaks) tells the system how much correction is needed and in what direction.

The contrast detection system employed in compact cameras is dumber. It just measures contrast in some image areas and moves the AF back and forth trying to improve contrast.

This is why dSLRs have so fast AF, while compacts are so slow in this regard.

So how’s Alpha 55 any different?

The new Sony a55 uses a translucent mirror. 70% percent of the light is directed to the main sensor, 30% to the AF system at the top.

See? No more moving  mirror. This camera includes the best of both worlds: it’s like a traditional dSLR (technically it’s a dSLT – T for “translucent” instead of R for “reflex”), with interchangeable lenses, fast shooting speed and autofocus, but with the simpler and lighter design of the compacts.

Features

Translucent Mirror Technology for simplified design, less weight and smaller size.

Continuous hi-res live image preview with phase-detection autofocus even during movie mode.

Hi-res Electronic Viewfinder (EVF) instead of the usual optical vewfinder in dSLRs, a necessary compromise due the lack of mirror.

Hi-speed, full-size shooting at up to 10 frames per second (only the very top Canon and Nikon cameras surpass that)

Fast AF during movie shooting (the only dSLR camera capable of this)

Fully-articulated 7.5 cm (3.0″) LCD

In-body image stabilization – up to 4 stops (this is not new, but still worth noting)

Integrated GPS for geotagging

HDR features from multiple images

High ISO 25600 capabilities, with noise unnoticeable prior to ISO800

Further info

More more info, check out the excellent indepth review on DPReview.com (spoiler: they give it the Gold Award.)

Pricing and availability

Dell Adamo

With much fanfare, Dell unveiled their new ‘luxury’ laptop this week. Just 16mm (0.65in) thick and weighting 1.8kg (4 pounds), Adamo (meaning ‘falling in love’ in Latin) seems aimed at the Macbook Air market. But is it really worth the hype?
Adamo’s system specs are as follows:

• 13.3″ display;
• Intel Core Duo 1.2 GHz;
• 2 Gb DDR3 RAM;
• 128 Gb SSD;
• Windows Vista Ultimate 64bit.

How much does it cost? Two grand. ($1999 to be more exact.)

Now excuse me, but it seems like a crazy idea to me. Coming out with an underpowered and overpriced laptop in these economic times? How are they planning to sell it?

Have a look at the advertorial below:

In case you got bored watching it, here are some quotes:

• “Adamo was created to elicit desire and redefine the image of power“
• “Adamo resulted from the union of technology with pleasure“
• “Once you hold it, you won’t want to put it down“
• “Because with this ultra-thin, portable aphrodisiac at your side, lack of attention won’t be a problem.“

Excuse me? Union of technology with pleasure? Portable aphrodisiac? Are we talking about a laptop here or were the copywriters on crack? My take is that they’ve tried to copy Apple’s style and failed. I mean, have a look at the video again, the woman pulls the laptop out of a cheap & ugly cardboard. Marketing 101: if you sell something at a premium, at least make sure it’s packaged like a jewel. (Apple knows it best).

Now, I’m no Apple fanboy (I don’t own any Apple products) but it seems to me that Dell dropped the ball on this one. Advertorial aside, the laptop specs don’t justify its cost and personally I don’t even like the design. I wouln’t buy it.

Would you?