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We <a href="http://www.canonrumors.com/canon-ef-600mm-f4-do-br-at-canon-expo/">learned about the development of the EF 600mm f/4 DO IS</a> way back in September 2015 at the Canon EXPO in New York City.</p>
<p>We’re being told that one or two additional DO lens is being developed alongside the EF 600mm f/4 DO IS and the plan is to announce them in late August 2018 ahead of Photokina 2018 in Cologne, Germany.</p>
<p>We’re not sure how well the EF 70-300mm f/4.5-5.6 DO IS sold, but I haven’t seen too many of them in peoples kits over the years. A replacement doesn’t make too much sense to us. It definitely wasn’t a bad lens, but I don’t think it was good enough or small enough to justify a purchase once the space saving 70-300mm f/4-5.6L IS was announced.</p>
<p>As always, lenses can be hard to nail down as far as announcement time frames go, but we’ll keep asking.</p>
<p><em>More to come….</em></p>
<p><em>image credit // <a href="http://www.popphoto.com/canon-is-working-on-600mm-do-br-telephoto-lens-with-its-latest-optical-tech">popphoto</a></em></p>
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