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Message: <blockquote data-quote="Alexis Powell" data-source="post: 1458208" data-attributes="member: 5327">Sorry, but the answers are no and no.  Those are the non wide-angle eyepieces that first came on the market in 1981 with the release of the original fieldscope.  The 20x (when used on a 60mm scope; it would be a 13x on the ED50) isn't that bad of an eyepiece--it has good eyerelief and a true FOV about the same as the 24x (on 60mm scope) WA.  The 27x you've listed here has short eyerelief, so I've never used it.  It is remarkable that both are still available.  Their principle utility is for owners of the original Fieldscope since it doesn't work with any eyepieces that extend into the scope body (as all modern fieldscope eyepieces do except for the 24/30x MC).--APPS here's a link to nonDS Nikon Fieldscope eyepieces<a href="http://nikon.com/products/sportoptics/lineup/scopes/mc/index.htm" target="_blank">http://nikon.com/products/sportoptics/lineup/scopes/mc/index.htm</a>And to DS eyepieces (only the first three are for fieldscopes)<a href="http://nikon.com/products/sportoptics/lineup/dsystem/ds/index.htm" target="_blank">http://nikon.com/products/sportoptics/lineup/dsystem/ds/index.htm</a>And by the way, the pics on the webpages you included in your post are accurate but sometimes sellers post the wrong pic (they'll show the MC WA version but be selling the old style) so be sure to check product numbers or specs to be sure waht they're selling.</blockquote>