These are the 20x,25x and the 30x power eyepieces for the Nikon EDG spotting scopes. They are huge! The 20x ocular lens(glass) is 30mm, the 30x is 32mm and the 25x eyepiece has an ocular lens size of 37mm. These are as large and in many cases larger than many Astronomy eyepieces now available. Here is a picture showing all three from left to right.... 20x , 30x , 25x in comparison to a silver US quarter and a gold colored 40mm coin.
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