What should I do if the cpl filter can be removed?

Generally speaking, it is recommended not to twist hard and never twist in the wrong direction again. You should calm down first and find the right direction (counterclockwise means loosening). If it is really in extreme temperature, you may wish to wait for the lens to return to room temperature before screwing it. When twisting, you can use some foreign objects to increase friction and avoid cutting your hands, such as using a rag, or try to tie a rubber band or cable belt to the filter element and then twist it hard.

In addition, the photographer can also put the lens on a rubber object (such as a mouse pad, a non-slip rubber pad, or even rubber slippers), with the filter facing the rubber surface, and then try to loosen the filter.

Some filters need to be disassembled frequently, such as CPL polarizers, so now some manufacturers add Telfon coating on the screws to facilitate screwing in and out and reduce the situation of jamming.

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If the spiral position of the filter has been deformed by collision, and the above method doesn't work, you may have to ask the maintenance department of the manufacturer for help. Of course, many photographers will go to Dont Ask For Help to dismantle the filter in their own way, but at this time, they must accept the fact that the filter will be damaged.

No matter what destruction method is used, protecting the lens itself is the first, but it is also extremely difficult. If you don't have tools or are worried about something, give it to the maintenance staff.