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Sony Alpha A55 – Review Part 2
14th March 2011
Unique Features of the Sony Alpha A55
The Sony Alpha A55 has a long list of features – some of which you may find in a few other cameras and others that are unique only to the A55. But taken together they they make the A55 a very compelling piece of equipment.
In Part 1, I talked about the “standard” features of the A55.
In this part of the review, I’ll key in on several of these features that are both unique and innovative.
The first three features are possible because of the A55’s translucent mirror.
Electronic Viewfinder
High Speed 10 frames per second capture
Full-time auto focus
Another feature made possible by the translucent mirror is full-time autofocus. Without a reflex mirror that has to flip out of the image path, the autofocus mechanism in the A55’s electronic viewfinder continues to operate uninterrupted.
Additionally, the A55 autofocus system uses phase detection and generally operates faster than contrast measurement. The result is that the autofocus is available 100% of the time for both still and video captures. Here is a sample video that shows that the autofocus works well for both movements of the subject and changes in the focal length of the lens. |
Keep in mind that the autofocus mechanism uses a small motor the drive the lens. Unfortunately, the built-in microphone has also recorded the sound of the focusing motor. One way to avoid this unwanted noise is to use an external microphone when shooting video. |
Articulating (moving) LCD
Built-in GPS
The A55 has several more impressive features that we cover in Part 3.
Written by Arnie Lee