![]() ![]() ![]() Turning this centre knob calibrates the unit, so all I needed to do was look at something on the horizon, set the scale to infinity, and then adjust the central wheel until the images in the eyepiece aligned. When I looked closely at the unit, I could see there is a knurled knob in the centre of the distance scale. The actual calibration of the unit at infinity was the simplest issue to fix. As it happens, both of these issues were easy to fix, as I’ll describe below. When I took it out of its leather case and tried it out, I found it was a bit out of calibration at infinity, and also the two images didn’t line up vertically when I looked through the eyepiece to try it out. When you turn the distance scale, the images move and when the two images are superimposed on each other and line up, you can read the distance that object is from you on the scale. One is slightly yellow/green and the other a normal view. When you look through this eyepiece at a scene, you see two images. Just to clarify how the rangefinder is used, there is a small eyepiece on the side of the unit where the distance wheel is. I picked up my Medis Rangefinder when I recently bought a Braun Paxina 35 medium format camera, and the Medis was included with it – in fact, the inclusion of the rangefinder was a big reason for buying the Paxina. ![]() Medis Rangefinder back view Medis Rangefinder front view Accessory shoe fitting The distance scale The unit out of its case Closer view of the unit The Mirror and Glass Adjustment screw for vertical alignment Screw re-sealed My Medis Rangefinder In this gallery there are some photos of the Medis Rangefinder and some shots of the internal workings. ![]() I remember my Dad had a rangefinder – probably a boots unit because he bought much of his photo equipment at boots 1, and used it with his Boots Beiretta viewfinder camera. Although cameras with a built-in rangefinder were common at that time, many photographers had cameras with adjustable focus which didn’t have a rangefinder, and this type of device was a simple and cheap way to help correctly measure the distance from the camera to a photo subject. The Medis Rangefinder is an example of a very popular add-on accessory for many amateur photographers in the 1950s and 1960s. ![]()
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