Konica Hexanon GR II 210mm

[JohnArs]

Hi all

I have the Konica Hexanon GR II 210mm and it is dirty in the middle of the lens. This is a called a barrell lens for reproduction wich does not have a shutter.
Is it possible to take apart or not for cleaning or is it a must for a repairman?

[acroell]

If "the middle of the lens" is the glass facing the aperture, you can probably do it, provided the 210mm is built the same as the 260mm GR II which I own. On each side of the barrel there are 3 tiny set screws sunk into the barrel, securing the lens cells. You have to remove/loosen those with a tiny screwdriver. After that each lens cell assembly can be unscrewed from the barrel by turning it.

[scootermm]

I have a 300mm Konica Hexanon GR II the front and rear elements just unscrew to get to the interior. after removing the set screws.

[JohnArs]

Thanks I did it and it worked well on my 210mm, but now on my 260mm wich I also have there is the dirth inside of the front element I tried to unscrew the front but had no luck so I think I must send it to a repairshop.