> ... What is the "real" justification for adding another piece > of glass to an expensive lens?
Some time ago I got an Olympus E20 and happily transferred my 'dust/knock protector' from another lens. First set of test files all looked a little pink - turned out it was a Skylight filter that I'd been using for several years. A UV filter fixed that. The other problem was the wide-angle teleconvertor which has a huge aspheric front element. No way was I easily going to get a filter for that - so I just became very careful :-) With my 1DS I have UV filters on 16-35, 24-70 and 70-200. They are there to protect the front element (they get used outdoors a lot). I've already replaced one after it was put away with a splash of Pepsi on it (I washed it later and now it's a spare) I suppose the real justification is that I'm happier to clean a cheapish filter than the front element of an expensive lens that I hope to keep for several years (which I thought was the real reason all along :-) bye for now Keith Cooper Northlight Images http://northlight-images.co.uk Photography - Digital Imaging - Apple Mac Consultancy Tel +44 (0)116 291 9092 Mobile +44 (0)780 162 9397 =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
