I have been facing autofocus issue with Tamron 70-300mm VC USM lens on Nikon D5300. The camera autofocuses fine through viewfinder but it is not able to autofocus at all in liveview, the lens just hunts for autofocus but not being able to autofocus in the end. The camera autofocuses fine in both liveview and viewfinder with all other lenses, which rules out the possibility of being something wrong with the camera. The Tamron lens was working fine like a week back and it suddenly started having this issue. I need help on what might be the cause of this and how to get it fixed. Thanks.
P.S: There are some dirt particles when i look through the viewfinder but it doesn't affect the shots. Just for FYI.