| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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While I can see some merit in using a plain glass protector in front of very expensive and often soft front elements, longer fast lenses with large front elements usually already have an internal filter holder which is part of the optical path.
My view is never to insert additional glass where it is not strictly needed for photographic purposes.
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Robert.