Robert Mueller wrote: > > Why must the viewfinder optics for the eye be shared with the laser? Just > put the laser below or above, though as near as possible. Of course. > magnification can be included. With separation you have no danger to the > eye except maybe if you measure the distance to a mirror! > > Bob > > Kalart designed their rangefinder to be used with an accessory device called the Focuspot for very low level light work. A beam splitter prism allows outgoing light to travel the same optical path as incoming light for measurement with the eye. Since the beam splitter is not 100% effective in blocking light to the rangefinder viewing eyepiece, there is some spillover. The same optics are used. In considering a laser to replace the focused light bulb of the Kalart Focuspot, it is prudent to block the normal rangefinder eyepiece during laser operation do that laser light does not enter the operator's eye.
It also simplifies the construction of the "low light level focus" device which can use the port provided for that purpose. Regards, Marv _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
