I can't seems to get my camera into focus (all blur) using extension tubes. I am sure it's user error but could use some guidance. I did ensure I followed the tube's instructions to mount the tube to the camera prior to mounting the lens.
Canon 100 2.8L
Kenko Extension Tubes
I tried various combinations of the tube sizes and also for curiosity tried an 18-135 lens just to see what would happen.
Any guidance would be appreciated it.