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Adjusting a Hugo Meyer range finder

 
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45PSS



Joined: 28 Sep 2001
Posts: 3206
Location: Mid Peninsula, Ca.

PostPosted: Fri Jun 08, 2012 4:03 am    Post subject: Adjusting a Hugo Meyer range finder Reply with quote

http://graflex.org/speed-graphic/hugo-meyer.html
are the adjustment instructions buried on this site.

I currently have two Anniversary Speeds in for repair, both with Model 4C Hugo Meyer side range finders.

The focal length the range finder is made for is printed on the base of the range finder which is next to the camera body when the range finder is installed on a camera.

The adjustments are under the thin long plate at the base of the range finder next to the camera body (referenced instructions, 7th bulleted line). One of these RFs adjustment screws has slot head screws and one has the 1/16 allen wrench socket head screws. The socket head screws are the easiest to adjust. The Name plate between the windows has no internal access under it.

The window glass is cemented in place on both RFs and removing the covers only allowed the outside of the glass to be cleaned easily.

The end caps of the main square tube can be removed by carefully prying them out with a small slot (common) screwdriver by placing the tip between the tube and cap. The caps are installed by placing them onto the main tube and taping into place with a screwdriver handle until they are flush to the tube.

The two screws on the outside edge about 1/3 the main tube length from the top hold the 50/50 fixed mirror prism in place and provide the lateral adjustment. Removing the screws allow the prism and its mount roll pin to slide the length of the tube. The roll pin lays into a slot on the prism between the mount/adjustment screws.
The lateral adjustment is accomplished by loosening one screw while tightening the other.

With the range finder removed from the camera and the bottom tube cap removed loosed the set screw holding the movable mirror block to the cam shaft. Remove the spring between the lower cam and body. The long side goes against the body and is positioned down with the shorter side up and against the cam below the adjustment screw.
Work the cam shaft back and forth while pulling outward until it comes out of the range finder. The movable mirror block will drop out also.

The gold transparent contrast coating came off both of these rf's mirrors when touched with a cotton swab moistened with Windex. The coating was bad on both making it hard to see anything through them.

The mirror block goes into the tube with the set screw at the rear and the mirror facing the window. The cam shaft slides in until it bottoms against the case and the back edge will be flush on the back side of the tube.

Set the adjustment screw on the lower and intermediate cams to center, equal number of screw threads either side of the cams. Reassemble the range finder base and mount it on the camera.
Attach the actuator arm.
Set up the lens infinity if not already done.
Focus the lens on a test target 3 feet away.
Secure the actuator arm according to the linked instructions.
Now move the movable mirror until the range finder is in coincidence and secure the movable mirror to the shaft with the set screw.

Focus the lens on the infinity target.
Adjust the top rf adjustment screw until infinity is in coincidence and adjust the lateral adjustment if needed.
Return to the 3 foot target and adjust the lower rf adjustment screw until coincidence is obtained.
Continue switching between infinity and 3 foot until no adjustment is needed to either.
Check the range finder against the ground glass image at several intermediate distances. They should match.
Install the bottom tube cap.
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45PSS



Joined: 28 Sep 2001
Posts: 3206
Location: Mid Peninsula, Ca.

PostPosted: Mon Jun 11, 2012 11:15 pm    Post subject: Reply with quote



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