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="WJC" data-source="post: 3416861" data-attributes="member: 25191">Hi Clive:If purchased new, EVERY “bin” you’ve seen has had it! That’s why a 6-footer can hand his binocular to his 6-year old daughter with both of them enjoying the same good image. The last time it was addressed in literature for consumers was 1953. It is not “mythical.” I recognized it back in 1976, have fought to get the reality recognized for 40 years, and finally got the concept recognized by SPIE in 2012 and published in their magazine PROCEEDINGS.Please read the attached PDF, and you will see why my “chirpy cheerfulness” has been brushed aside trying to wrest inaccurate notions from those who would help their neighbors screw up their binos by saying all you need to collimate your binocular is a roofline and a screwdriver.BillPS The reason you haven’t seen Conditional Alignment is because I coined the term. But, fortunately, it has been used, referenced, and explained on BF, and other forums, many times over the last few years.I was speaking about the condition with a professor at the University of Arizona’s Optical Sciences Center, and in mentioning the “problem,” he said: So!?I told him to think about it, and the phone got really quiet for a while. Then I heard:Oh … Oh, my … OH, MY!!!A few hours later, I was invited to give a lecture on the topic at the 2012 SPIE Conference in San Diego. The PhD types never have a need to address the issue and the public doesn’t even know they should. It was a harsh reality that needed a name and, having worked with binoculars for decades, I gave it one.</blockquote>

Verification