Opening a MEDICAL NIKKOR for repair

forest bagger

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If anyone is interested in how to open the front of a Medical Nikkor 120/4-32 to clean dusty lenses or an oily aperture:

 

Dan Fromm

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Andreas Thaler said:
What had to be done, and would you like to explain the control electronics in the tube? There's a four-sided circuit board with discrete components inside, unbelievable!
Click to expand...

The 120/4 Medical Nikkor came to market in 1981.
 
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ic-racer

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Looks like it is in nice shape. How is the flash triggered? From the diaphragm movement?
 

Dan Fromm

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I b'lieve they're fixed aperture, could be mistaken. Effective aperture varies with magnification.
 
OP
OP

forest bagger

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Andreas Thaler said:
What had to be done, and would you like to explain the control electronics in the tube?
Is the small light bulb part of a lighting system?
Click to expand...
The small light bulb is the modeling light.
As written before the dusty lenses and the oily aperture had to be cleaned.
This MEDICAL lenses have a aperture that is mechanical coupled with the magnification rate and the focus distance - the smalles magnification rate works only with f/4 at a focussing distance of about 1.5 meters, and the biggest magnification rate is at f/32 at a focussing distance of some 20 centimeters.
The MEDICAL controls the flash power via a photocell located in the bayonet that measures the light reflected from the film surface.
 
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