Using 80A instead of UV or Skylight filter

[DesmondLeong]

Would like to know why some photographers using 80A as their lens front filter
instead of UV or Skylight filter.

Thanks.

 

[DesmondLeong]

Would like to know why some photographers using 80A as their lens front filter
instead of UV or Skylight filter.

Thanks.

Anyone can give some comments ?

Thanks