变焦环

(photography) focus ring

to change / to become different / to transform / to vary / rebellion

(photography) zoom / (optics) to adjust the focus

surname Jiao

burnt / scorched / charred / worried / anxious / coke / joule (abbr. for 焦耳[jiao1 er3])

surname Huan

ring / hoop / loop / (chain) link / classifier for scores in archery etc / to surround / to encircle / to hem in