This type of filters are recommended to be kept on a lens at all times!!!
It has a triple effect:
1) improves image quality by blocking UV light, which causes hazy images
2) protects your front element against cleaning marks
3) protects your lens against light to medium knocks
(to view my ebay shop listings, please click on the link below)
http://stores.ebay.co.uk/classic-photography-england?_trksid=p2047675.l2563
Any questions can also be sent directly to:
classic.photography.uk@gmail.com
Thank you for visiting!