Sony Alpha Metadata Specifics

Owners of mirrorless cameras **Sony Alpha (A6000, A7, A9 series)** often try to find out the shutter mileage encounter difficulties: the standard file viewer or regular metadata sites refuse to show number of frames.

Why did Sony engineers make the mileage reading structure more complex than Nikon's intuitive approach?

1. Changeable structure of MakerNote across different generations of Sony

If Nikon has been using a constant hex tag `0x00a7` for 20 years for all cameras from D90 to D850, then Sony **changes the MakerNote recording structure from generation to generation**:

• Sony A7/A7R/A7S (1st generation):Gate data is encrypted at tag address `0x9050` in the block `ImageCount`.
• Sony A7 II / A7 III / A6300 (2nd and 3rd generations):Data moved to offset 16-bit array `ShutterCount`.
• Sony A7 IV / A1 / A7R V (4th and 5th generations):Added deep control support electronic front curtain shutter (EFCS).

2. Separation of EFCS shots and mechanical shutters

Most Sony cameras default to **Electronic Front Curtain Shutter (EFCS)** mode. curtain and mechanical second curtain.

Because of this, the load on the drive is distributed differently, and conventional Exif parsers are confused when trying to determine a clean mechanical wear.

Comparative table of mileage availability by brand

Brand	Difficulty reading EXIF	Determination accuracy
Nikon	Very simple (1 tag for all models)	100% accurate from any JPEG/RAW
Sony Alpha	Medium (revision parser required)	95% accuracy on fresh models
Canon	High (requires special software for USB)	Depends on DIGIC generation