After pulling your old single-lens-reflex (SLR) camera out of storage, you notice that the focus ring resists movement when you attempt to rotate it. Don’t worry – this is a very common problem that plagues many vintage manual-focus lenses during their lifetimes. Lenses are given small doses of lubricant before they leave the manufacturer. Over time, it can dry up and become sticky, resulting in the sluggishness you feel when trying to focus. Warnings Writer Bio
