Roof Prism Binocular Collimation

Contain 2 prisms called dach or dachkanten prism and derive their name from abbe koenig ak prism design.

Roof prism binocular collimation.

These are easy to hold for you are more compact and more expensive than porro prism binoculars. The arrowed screws in the images are the collimation screws that pass to the outside through the housing. Aligning the prisms the typical cause of porro prism binoculars losing collimation is being dropped or receiving a knock that shifts one of the prisms. The eccentric ring ajustment is more often found on roof prism bins and is extremely difficult to adjust without the correct equipment and some experience.

The prisms are held onto a mounting plate with a metal clip. Provided the binoculars are not severely out of collimation the collimation is accomplished using the porro prisms housed just in front of the eyepieces. The system used in binoculars consists of two prisms with at least one prism having a roof edge. This can cause eyestrain headaches and a degraded user experience.

In a roof prism binocular the prisms reflective surfaces resemble those of a rooftop hence the name. Normally the collimation is adjusted by screws on porro prism bins which i assume that 20x60s will be.