I recently got my uncle's old cameras and accessories and I found 2 filters that are fitting on my Nikon D5000 kit lens.
I believe one of them is an ND filter? What do the C-P-L letters mean?
This one? What is the purpose and is it useful for anything?
This was taken without the filter:
And a similar shot with the the filter:
Frankly, I can see very little difference between the 2.
So, In what situation could I use this?
Thanks for any help you can provide.