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: 3437718" data-attributes="member: 133897">Hi,that question is easily answered - they traded a smaller zoom range for higher AFOV at the low maginification end, as did all manufacturers with wide-angle zooms to varying degrees.With the new Zeiss we have a 2x zoom with an AFOV of around 60 degrees at the low mag end and around 80 at the short end, as with Leica, Meopta and the Swaro ATS/STS wide angle EPs. The Kowa WA zoom for the big bodies and the Swaro ATX/STX eyepiece module have 2.4x with about the same AFOV range as the 2x models mentioned above, which makes them quite sweet.For astro scopes there's 1.7x zooms with a constant AFOV of 80 degrees (Speers Waler Zoom or the discontinued Astro Zoom Kit).Joachim</blockquote>