BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Reply to thread

Message: <blockquote data-quote="Kammerdiner" data-source="post: 2855708" data-attributes="member: 75300">I once called this "barrel slop," but I've never seen a technical term for it. It's caused when one barrel has more freeplay/slop in the focus mechanism than the other side. As a result good focus only happens arriving from one direction because one barrel lags behind going the other way. You can use the diopter to change the direction in which good focus occurs, or if it's not too bad split the difference and hope your eyes can accomodate, but you can't focus well from both directions no matter what you do. I agree it is annoying. I suspect when folks say they have to "hunt" for perfect focus, or that it doesn't "snap" into focus they might in fact be experiencing barrel slop (or whatever you might choose to call it).I think if you explain what's happening, the repair technicians should easily see it too.A Zeiss wouldn't be involved would it? Holger mentioned seeing two samples of the new 8x32 Conquest HD that had this problem.Mark</blockquote>