citação:Anti-dust measures
Sony have modified the CCD-shift system in the Alpha so that it will vibrate when the camera is switched off. By doing this, the CCD-shift mechansm should behave similarly to Olympus' Supersonic Wave filter, dislodging dust particles that are adhered to the sensors surface. Sony have also added a specially formulated anti-static coating to minimise any static build-up that would hold dust in it's place.
The images below are the results of testing the effectiveness of the system. For testing purposes, I allowed dust to build up on the sensor by opening the shutter for long periods using the bulb setting until the amount of specks were substantial enough. The shutter was opened for over two hours in total, which would be the equivalent of many lens changes under normal circumstances. I then switched the camera on and off five times. If you move your mouse pointer over the left-hand image, you will see the effect this had.
After seeing that the dust hadn't budged an inch after five cycles, I concluded that static build-up on the sensor's surface must be responsible for holding the particles in place. To make sure this wasn't the case, I removed the battery from the camera and left it overnight so I could repeat the process in the morning. The image on the right-hand side is the result of repeating five cleaning cycles in the morning, moving your mouse-over the image will show the results of this test.
Unfortunately, vibrating the sensor still hasn't budged most of the dust. If you move your move pointer over the right-hand image repeatedly, you'll see that one of the larger particles has rotated slightly, but that's it I'm afraid.
It's a shame this test ended in disappointment, I really wanted this seemingly good idea to be effective, but as you can see from the results, it's far from it.
