B+W 67mm UV MRC Filter
 

LNIB, still have the box
selling because I want matching T* coating to my lenses

very high quality F-Pro brass threaded filter
glass is Made in Germany by Schott which is the supplier for Zeiss
multi-resistant coating beads water off and is dust repellent/scratch resistant
I've used this to protect my lenses, which also makes it a bit contrasty
never had an issue with ghosting/glare during night photography
pretty much near perfect reviews online

don't forget you can use step-up/down rings on your lenses so this isn't limited to 67mm threads...you can get 'em off ebay for a buck or two.

http://images.craigslist.org/00M0M_3...kE_600x450.jpg

asking $60

https://www.vistek.ca/store/CameraFi...-screw-fi.aspx