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A7Riv 200-600 lens help needed!

Piscavian

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Mark
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
 

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