DPReview.com is closing April 10th - Find out more

RF 70-200 or EF 70-200 with Converter for EOS R

Started Jan 30, 2020 | Questions thread
Nimonus Contributing Member • Posts: 556
Re: That tried and true "air pump" design

The front and rear glass of a lens are the weakest link.

For dust-proof,

  1. Best: zoom and focus are all internal. There have no breath-in or out.
  2. Worst: zoom and focus are all external. There have many breathe in and out.
  3. Moderate: either external zoom, or external focus.

Any breathing will bring in the dust, whatever the filtering system using, it's just when.

Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow