Aperture after half focus is higher than before?

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Invanovich22 Junior Member • Posts: 45
Aperture after half focus is higher than before?

I use NEX-5T and Sony 16mm F2.8 pancake lens in "M" mode, ISO 100

When i press shutter button half way it auto focus and image becomes brighter, also histogram change towards more white.

This is major inconvenience because i need to set settings lower than needed so image don't get overexposed, is this some feature of the camera i can disable?

NEX-5T
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