A7Riv 200-600 lens help needed!

[Piscavian]

I have the above lens and have been using it for a few months (new to the A7riv and this lens). I have just purchased a (second hand) TT Artisans 50mm manual focus lens as a second option. This lens apperes to work fine (though will take some getting used to). I have just put my zoom lens back on, but now there is no image unless I press the AF-On button (which I have set for back-button focus). there is absolutely no image in the viewfinder unless this button is pushed (lens is set to autofocus- this has not changed). Anyone know what I have done wrong?

Cheers,
Mark

 

[Uncle Kevriano]

I have the above lens and have been using it for a few months (new to the A7riv and this lens). I have just purchased a (second hand) TT Artisans 50mm manual focus lens as a second option. This lens apperes to work fine (though will take some getting used to). I have just put my zoom lens back on, but now there is no image unless I press the AF-On button (which I have set for back-button focus). there is absolutely no image in the viewfinder unless this button is pushed (lens is set to autofocus- this has not changed). Anyone know what I have done wrong?

Cheers,
Mark

You have probably inadvertently put the monitor setting to manual and selected monitor, not viewfinder. or auto. I have mine set to auto on the A1, but viewfinder constantly on the A7RiV as it's eye detect sensor is a bit rubbish. Anyway, the old lens will have changed it, so just go into the menu and look at your viewfinder settings.
As an aside, I reprogrammed my focus hold button on the lens to switch between finder and monitor.