Sony A7R II / IBIS / crop factor

[bristo]

Hi everybody,

I have a question about the stabilization with the A7R II.

When I use a non native lens like a zeiss sonnar ZM 50 mm f1,5 with an adaptator ring in APSC mode what is the focal I have to specify in the steady focal lens menu?

Is it 50 mm or 75 mm  in APSC mode?

thanks for your help.

[TheRenaissanceMan]

I haven't used the camera, but I'd assume you use the real focal length: 50mm.

[Don Kotlos]

Always set the actual focal length of the lens. So for a 50mm set it to 50mm. 

The sensor movement is independent of the crop and only depends on the focal length. 

[bristo]

thank you

[Guest Ebrahim Saadawi]

Wouldn't I need the extra stability going to the 80mm-ish FOV/shake vs using it in FF mode? 

I'd personally set it for 80 actually not 50... 

 

[Nikkor]

Wouldn't I need the extra stability going to the 80mm-ish FOV/shake vs using it in FF mode? 

I'd personally set it for 80 actually not 50... 

 

The camera knows it is in aps-c mode.

[Don Kotlos]

Wouldn't I need the extra stability going to the 80mm-ish FOV/shake vs using it in FF mode? 

I'd personally set it for 80 actually not 50... 

The crop factor is irrelevant. 

Think about it: Take an image that is projected on the full sensor. Now you move the camera by x amount. How much the image moves on the sensor depends on the focal length of the lens. Crop it now as much as you want. The physical movement of the camera is the same, the image projected on the full sensor has moved the same as before, so the compensation by the IBIS should be the same.