a6300 won’t go wide open in shutter priority

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Bluerio Regular Member • Posts: 241
a6300 won’t go wide open in shutter priority

I’ve a strange behaviour from my a6300 and sigma 35mm art mounted through an MC-11 adapter.

When in shutter priority the aperture goes down till f/2 and then starts to bump up the iso instead of going to f/1.4. Has anyone notice that or any setting I am missing?

In manual or AV no problem.

 Bluerio's gear list:Bluerio's gear list
Sony a6300 Sony Alpha a7R III Canon Extender EF 1.4x II Canon EF 70-200mm f/4L IS USM Sony E 10-18mm F4 OSS +6 more
Canon PowerShot A630 Sony a6300
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