why internal zooms not so desireable?

Started Feb 7, 2013 | Discussions thread
Veteran MemberPosts: 3,176
Not true
In reply to FrankParis, Feb 7, 2013

FrankParis wrote:

Is it true that only internal zooms can be weather and dust sealed?

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Frank Paris

Wiping seals can be installed on extending lens barrels. For exmple, see the 12-60 FT lens.

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