Upload & Sell: Off
Next time you have a few spare minutes, take a picture of your house at night. Or just the street lamp, in such a way that it's off center. You'll end up with two - one exactly opposite, upside down. That's what the filter did.
I used to say that while I understand my filter may in theory change image quality, I've never seen it in practice.
Then I dd some long exposure night photography. Changed my views in one ruined outting.
Look at the front of your filter. Glass is flat. Look at your lens, more than likely it's not. Do you think the filter was made to the same exacting specifications that a high precision lens element is? I think not.
Don't put bad money on a good lens. Besides, what are you protecting it from? If it is rain/snow/blood of the non-believers, the lens isn't weather sealed.
There's in my mind, no reason other than actual protection from real environmental conditions to use a filter. Creative filters not withstanding.