Why check the operating time of SONY ILCA-77M2 when purchasing

The SONY ILCA-77M2, also known as the Alpha 77 II, is a unique instrument with Semi-Transparent Technology (SLT). This technology made it possible to achieve a phenomenal burst shooting speed for its time - up to 12 frames per second with autofocus tracking working. Due to this outstanding "rate of fire" these cameras were often used for reportage, sports and wedding photography. Consequently, on the secondary market there are often specimens whose appearance is ideal, but the internal resource is already approaching a critical point.

The peculiarity of the A-mount and the translucent mirror is that the mirror is stationary. However, the mechanical shutter still takes every frame. And it is the intensity of use of serial shooting that is the main wear factor. Buying “blindly” without checking the mileage may result in the need for an expensive replacement of the bolt block in the first months of use.

Shutter life and design reliability of the A77 II

At the heart of the ILCA-77M2 is a 24.3 megapixel APS-C sensor. The shutter of this model was originally designed for serious reporting loads. The manufacturer set a resource of 150,000 operations, which is quite respectable for crop cameras of that generation. In practice, with careful operation without constant long series “on the floor”, the mechanics can easily take care of 200-250 thousand frames.

It is important to understand that wear and tear depends not only on the number of clicks, but also on conditions. Shooting in the cold, high humidity or dust (even though the carcass has basic moisture protection) affect the lubrication of the mechanics. Therefore, the mileage figure is the basic and most important indicator of the health of the camera, from which you need to start when assessing the remaining life.

Accurate mileage determination using EXIF ​​data

Despite the complex electronics, Sony did not hide camera usage statistics from users. The BIONZ X processor keeps a strict and continuous record of every movement of the mechanical curtains. This log is not stored somewhere in inaccessible service memory, but is automatically duplicated into a hidden MakerNotes section within the EXIF ​​data of each photo taken.

This means that any fresh image (both RAW .ARW format and regular in-camera JPEG without processing in editors) contains an accurate frame counter for the entire life history of the device. And, what is most valuable, this counter cannot be “twisted” by a software reset or firmware update. The number in the metadata always reflects the real state of affairs.