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="jring" data-source="post: 3333351" data-attributes="member: 133897">Hi,what is called 3D effect is based on the widening of the stereo base when using binoculars with a non-linear light path, eg. pairs with normal Porro or some Abbe-Koenig prisms.With straight through bins with Schmidt-Pechan prisms the stereo base stays the same as your interpupilary distance and the view is flatter.So I'm not sure what people mean when comparing two pairs with Schmidt-Pechan prisms and saying one has a better 3D effect.There is another effect that the brain needs a certain amount of field curvature for a good impression of space, so a very flat field as you get with high end bins using a field flattener lens might actually me counterproductive here. But I think the Conquest series does not have a field flattener...Have a good start into 2016,Joachim</blockquote>