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D-638.
What you see in the photo is actually the edge of the beamsplitter plate, a 1mm thick piece of glass.
I think its possible they used a triangle as a beam splitter and printed the reticle on the glass perpendicular to the optical axis. Since im using a beam splitter plate at a 45 degree angle, a horizontal wire is in focus across its length but not a verticle one. If a wire is suspended in free space ahead of the beamsplitter plate i get a double image, and its really difficult to get the position of the wire perfect. -but it does work.
The reason the color is yellow is because i bought a 1/20 wavelength 3" mirror for the target that is selectively coated to reflect green light at a 45 degree angle, and for the 2" mirror missing inside the d638 i bought a mirror selectively coated for 638nm, and im using an led flashlight for a light source. Should improve with a green led.
What you see in the photo is actually the edge of the beamsplitter plate, a 1mm thick piece of glass.
I think its possible they used a triangle as a beam splitter and printed the reticle on the glass perpendicular to the optical axis. Since im using a beam splitter plate at a 45 degree angle, a horizontal wire is in focus across its length but not a verticle one. If a wire is suspended in free space ahead of the beamsplitter plate i get a double image, and its really difficult to get the position of the wire perfect. -but it does work.
The reason the color is yellow is because i bought a 1/20 wavelength 3" mirror for the target that is selectively coated to reflect green light at a 45 degree angle, and for the 2" mirror missing inside the d638 i bought a mirror selectively coated for 638nm, and im using an led flashlight for a light source. Should improve with a green led.
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