could anybody please tell me is it normal? I remember it was f/3.5 in A mode with over-exposure warning LED blinking. The shutter tried to be quicker than 1/500 and thats the result?
At the shortest time, almost all the exposure will be done with the shutter blades partially closed - and leaf shutter blades do have a very distinctive shape.
There is no stickiness, this is just the shape of the shutter blades.
Shutters don't open and close instantaneously. As Sevo pointed out, at 1/500s a significant part of the exposure is done through partially-closed shutter blades even if the shutter is working perfectly.
Because part of the exposure is when the shutter blades are opening or closing they act as a stop increasing the depth of field. That's why the logos on the side of the building have ben resolved. If you had taken the picture with the lens stopped down more you wouldn't have seen the effect so much. At large apertures leaf shutters are inefficient and their efficiency increases as the lens is stopped down.
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