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Message: <blockquote data-quote="John Dracon" data-source="post: 1760193" data-attributes="member: 14799">Frank - I have a pair of those AG marked Nikon 10x32 roofs.  Have wondered myself about the letters AG.  Assumed it was connected to the serial number in some way.The Nikon brochures mention the HG models had silvered prisms which must mean they have SP prisms?  This generation of Nikon alphas is an outstanding glass. I haven't been able to compare them to the eco glass models.  Had a pair of Nikon 8x42 Ventures with AG marked on them.  On a trip to Fort Jefferson off the Florida coast in 2002, I ran into a professional bird guide, the kind with a vest covered with all kinds of patches proclaiming his expertise.  He was using a Swarovski El 8.5 x 42, and mighty please with it.  We exchanged glasses for about an hour.  His comments about the ELs were toned down a bit after that.  I understand that Nikon had to go to the EDG - monkey see, monkey do, or imitation is the sincerest form of flattery.  But the older Nikon AG can hold it own with any glass.  A little bit on the heavy side.JohnJohn</blockquote>