Dismantle 1939 Hektor 135/4.5 Optical block

[Baybers]

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Hello, hope this is the appropriate forum.

I have the above lens which has some dirt and light haze inside. I have unscrewed the optical block from the focus body and now want to remove the front element and access the other elements. The topics I have looked at are mainly concerned with later variations of this lens and don't seem applicable to this dinosaur.

My question is do I need to remove this screw before attempting to unscrew the front element and does it come apart where I have arrowed? Or perhaps remove the aperture ring? Any help is appreciated. Cheers.

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[jerzy]

no, you do not need to remove the screw for the first element. But you need to remove screw and the ring with scale (sleve) if you want to clean the aperture ring which is advisable in any case. Removing the sleve might be tricky, very often it sits very firm. But you may use aperture ring to initiate sleve removal. Remove the 2 screws on aperture ring, remove the screw on the sleve and start to unscrew the aperture ring. It is screwed on, after few turns unscrewing it the sleve shall start to move up. If not than apply a bit of WD40 under the sleve and lave it for 1-2 hours so that WD40 can penetrate. After unscrewing aperture ring few turns the thread ends but then you shall be able already to pull the ring up together with the sleve.

[jerzy]

... but may clean the haze as well from the backside, could be easier. Unscrew that rear group and with aperture opened you ay reach the innser side of the first lens. Haze is usually locate4d on the surfaces adjacent to aperture

[Baybers]

Thank you jerzy, I cannot see a notched retaining ring or any other means of accessing the rear group. This obviously changed throughout the life of this lens as many of the articles suggest this, but on later models of the lens. 

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[jerzy]

the rear lens does not have retaining ring, the part marked with arrow screwes out together with the lens. But you might need special tool to unscrew it. Try to unscrew the front group, photo shows Hektor 468689, 1938, should shall be the same#

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[Baybers]

Cheers, will try this, thank you.