Famous Stiff Focus Ring Lighter Fluid Ideas. Web the good man said 'yes, easy', took a can of lighter fluid and applied it to letting it run into the slight gap between the barrel and the focus ring, then gave the ring some full turns and wiped off the remaining lighter fluid! Web if you're feeling somewhat reckless you can use a small bit of lighter fluid on the focus helicoil from the back and work it in.

If the lens front barrel is not bent, the only reason for stiff. Web the good man said 'yes, easy', took a can of lighter fluid and applied it to letting it run into the slight gap between the barrel and the focus ring, then gave the ring some full turns and wiped off the remaining lighter fluid! It it acceptable for focusing directly by hand, but using a follow focus system.