Tero
Retired
This one was an 8x21 roof prism, before I sawed it open. Looks to be aluminum partly:
http://i9.photobucket.com/albums/a57/Tero1111/bino1.jpg
The small lenses next to it, and the metal ring, were the eye piece. There was a plastic barrel inside the metal one that moves the 21mm lens back and forth. Normally the big lens does not move.
Inside the barrel was a housing holding the two prisms. The first one that came out is shown here, along with metal pieces tha held it in place.
http://i9.photobucket.com/albums/a57/Tero1111/bino3.jpg
With some jiggling, the other prism came out. The left one is toward the eye piece.
http://i9.photobucket.com/albums/a57/Tero1111/bino2.jpg
It sure was strange looking, and I did not figure out how they had fit together, but one rested on the other somehow. I guessed that the point had to face the eye piece, then you have two flat glass surfaces against each other. The right one has a mirrored surface inside, painted black outside.
OK, I have not learned much. But the prisms fit in nicely, smaller than I expected. I guess they are at the point where the beam of light is fairly narrow.
http://i9.photobucket.com/albums/a57/Tero1111/bino1.jpg
The small lenses next to it, and the metal ring, were the eye piece. There was a plastic barrel inside the metal one that moves the 21mm lens back and forth. Normally the big lens does not move.
Inside the barrel was a housing holding the two prisms. The first one that came out is shown here, along with metal pieces tha held it in place.
http://i9.photobucket.com/albums/a57/Tero1111/bino3.jpg
With some jiggling, the other prism came out. The left one is toward the eye piece.
http://i9.photobucket.com/albums/a57/Tero1111/bino2.jpg
It sure was strange looking, and I did not figure out how they had fit together, but one rested on the other somehow. I guessed that the point had to face the eye piece, then you have two flat glass surfaces against each other. The right one has a mirrored surface inside, painted black outside.
OK, I have not learned much. But the prisms fit in nicely, smaller than I expected. I guess they are at the point where the beam of light is fairly narrow.