One of the longest standing debates in photography circles: To put a protective filter over the front lens-element, or not?
Not more of the the usual blah...blah...blah on the topic, Lens Rentals gets all science-y and reports their findings:
My Not Quite Complete Protective Filter Article
The one Hoya filter scored very well on all the tests and only averages $20. That's a bargain plus it is the thinner profile which is more advantageous for wide angle lenses. Thanks for the info.
https://www.bhphotovideo.com/c/sear...&N=0&InitialSearch=yes&sts=ma&Top+Nav-Search=