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Message: <blockquote data-quote="fotojack" data-source="post: 214389" data-attributes="member: 16"><p>And for those of you with the extension tubes that have the electrical contacts, here's a little tip: use dielectric grease on the contacts, and even on the mating surfaces of metal connections, to make installing smoother and easier. I'm talking a micro thin layer here...don't slather it on! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> This even works on all lenses with metal connections. Prevents corrosion of metal surfaces.</p></blockquote><p></p>