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="Binastro" data-source="post: 3227499" data-attributes="member: 111403">.Dear oracleman,. Thank you very much for the PDF link.If this is accurate, then it indicates that the stabilisation method has not substantially changed to the method of the 2014 8×25 image stabilised binocular.It says that it has a doublet field flattener. I don't know if this is in addition to a five element eyepiece. If it was then I would expect the edge performance to be better than my older 10×30, where the edge performance is not as good as the better Canon image stabilised binoculars. However, I'm always suspicious of manufacturer's written specifications and the only way to check really would be to dismantle a 10×30 II, which of course I wouldn't do.Your query earlier about different apparent fields of view is only because the simple 6° times 10 gives a 60° apparent field of view and the iso-standard uses the tangent of the half angle to give a smaller number, even though both are the same.I think that Holger Merlitz, I hope I have the spelling correct, suggests that the correct apparent field of view may depend on the distortion of the binocular eyepieces, but that is a complication we don't have to go into here.I can't remember if the 10×30 also has optical windows in the front of the objectives. I'll have a look later.</blockquote>