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="oleaf" data-source="post: 1647638" data-attributes="member: 52491">I've read many posts where folks actually measure their IPD and set their bins and forget it.  I believe the IPD changes a few mm based on distance.  I've been doing this method for a while without thinking about it.  Seems to work for me and requires no measurements.  And can be adjusted for every distance.Find a target at the distance you'll be viewing.  Defocus your binoculars so everything is blurry.  Notice you can now see the FOV (circle of view) edges clearly.  Open bins wider and close down until the circles overlap.  But, don't try to watch the edge of the FOV while doing this.  Just look in the center of the defocused FOV.You'll actually "feel" when the circles overlap perfectly.Seems like a fast way to nail the IPD at any distance... try it and see if it works for you.I think if you do this with everything in focus you can't see the FOV circles overlap the way they should.Cheers</blockquote>