help with canon 2x III extender autofocus

[ptapaskar]

Hi 

I have a canon 100 400 IS II USM lens and have recently purchased a canon 2x III extender. 

I have a canon 6D mark II camera.

I need help/advice. on the following issues.

1. I cannot auto focus using the extender. In fact the autofocus option disappears once the lens and extender is mounted on the camera. 

2. The pictures are a bit hazy. 

3. Any other tips to take wildlife photos using the extender. 

Thank you. 

1. 

[wq9nsc]

I don't use the 100-400 lens but every generation of it of which I am aware has a maximum aperture of f4.5 which puts it at f9 and outside of the f8 capability when using a 2X extender.

Rodger

[normadel]

You need to read the lens's manual carefully. This is what  it says: