terence_tong1 Posted July 5, 2006 Share Posted July 5, 2006 I just got my 17-40 and discovered there's a rubber ring around the metal lens mount. presumablly for dust/moisture prevention. How come my 70-200 f4 doesn't have it? is it a newer addition? because my old 100-300L, didn't have one either. Can you add on yourself? buy the ring from Canon and glue it on? Thanks TT Link to comment Share on other sites More sharing options...
gluteal cleft Posted July 5, 2006 Share Posted July 5, 2006 Not all "L" lenses are weather-sealed. Link to comment Share on other sites More sharing options...
franklin_polk Posted July 5, 2006 Share Posted July 5, 2006 You could buy a rubber ring (although not from Canon, they would have to be fitted to a specfic lens), but it really is not worth it, as for weather sealing on your other lenses, you'd also have to put gaskets for the distance window, weather seal the focus ring, etc. Weather sealing is more than just a ring around the lens mount. In addition, for full weather sealing, with your 17-40mm, you also have to add a filter. Link to comment Share on other sites More sharing options...
PuppyDigs Posted July 5, 2006 Share Posted July 5, 2006 Also, for a really tight seal, the lens mount on the 1D series sports an 0-ring as well. However, I'm sure the single seal on the lens is helpful even if you don't have a 1V or 1D- series body. Sometimes the light’s all shining on me. Other times I can barely see. - Robert Hunter Link to comment Share on other sites More sharing options...
jcolwell Posted July 5, 2006 Share Posted July 5, 2006 You can find a list of rubber ringed lenses in FAQ 17 at the <a href="http://www.photozone.de/8Reviews/canonFAQ.htm">PhotoZone Canon FAQ</a> Link to comment Share on other sites More sharing options...
terence_tong1 Posted July 6, 2006 Author Share Posted July 6, 2006 Is there a rhyme or reason to which lens is Tropicalized? Wouldn't one use a 70-200 f/4 more out door? or because 17-40 is the wide angle/landscape lens, it's used as outdoor landscape lens? Thanks for the FAQ! good list Link to comment Share on other sites More sharing options...
steve_dunn2 Posted July 6, 2006 Share Posted July 6, 2006 <p>Yes, there's a rhyme or reason. The IS superteles were the first Canon lenses to have this level of dust- and water-resistance, including the rubber O-ring. AFAIK, all L lenses introduced since then have also included these features. Your 70-200 and 100-300 both predate these features.</p> Link to comment Share on other sites More sharing options...
lovcom_photo Posted July 11, 2006 Share Posted July 11, 2006 Steve does the Mark II 85L have the gasket too? Link to comment Share on other sites More sharing options...
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