Message:

<p>[QUOTE=&quot;afantiques, post: 91116, member: 25&quot;]Not 19th C.</p><p><br /></p><p>Mention of prismatic binoculars (invented in the 1890s or so, indicates this. These are early 20th C.non prismatic binoculars unusual in their extreme range of focus. I have no idea why anyone would want this feature. </p><p><br /></p><p>WWI period is most likely. </p><p><br /></p><p>Try some practical experiments with that extreme range of focus. You may be able to determine how it works in the field. </p><p><br /></p><p>It just may be that they are prismatic without the usual&nbsp; pentaprism shape, and with some peculiar optics that dictate the odd shape.</p><p><br /></p><p>The objective lenses should unscrew, a glance inside would show either the expected straight through construction or something else more interesting.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in