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Carl Zeiss Planar 1.8/50 QBM reassembly
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PostPosted: Sun Aug 24, 2014 11:07 pm    Post subject: Carl Zeiss Planar 1.8/50 QBM reassembly Reply with quote

Today at a local flea market I found lovely bag containing a Rollei SL 35 with many accessories, a beautiful Carl Zeiss Planar 1.8/50 (non hft, made in West Germany - I guess from the early '70s), a Tamron adaptall-2 3.5/200 with qbm mount and a Vivitar 2.8/28 close focus in nikon mount. The planar has stff focus, but the whole bag was really cheap so I bought it.
At home I disassembled the Planar quite easily, remembering the steps from a thread here. The old grease became completely solid: it took me a while to scratch it off the two helicoids, but now the lens is clean and freshly re-lubed with lithium grease.
My problem is that I can't figure out how to put it back together: the thread is without images now, and I can't find the correct order in which to reassemble the two helicoids while keeping the focus guide and aperture arm in the correct position.
This is the thread : it would be really great if somebody that knows this lens could help me, or if user Srdjan could re-upload the pics in that precious old thread.
Thanks.


PostPosted: Mon Aug 25, 2014 1:27 am    Post subject: Reply with quote

http://www.digicamclub.de/showthread.php?t=17682
Good luck!
Thomas


PostPosted: Mon Aug 25, 2014 11:11 am    Post subject: Reply with quote

duckrider wrote:
http://www.digicamclub.de/showthread.php?t=17682
Good luck!
Thomas


Thanks, I'll try again later.


PostPosted: Thu Sep 11, 2014 7:03 pm    Post subject: Reply with quote

Alesandro,

I'm sending some pics showing the lens inside and try to explain how to re-assemble the lens back. Stay tunned,





Renato


PostPosted: Thu Sep 11, 2014 7:39 pm    Post subject: Reply with quote

... And starting...

Firstable, excuse me for the quality of the photos, were made with a cell phone and my 6 y.o daughter had used it before me, and the lens of the phone was dirty!

In the pic bellow you see the lens in the order will be mounted - from bottom to top:



Helicoid group, diaphragm ring and back metal cover with focus displacement track and pin for wide open metering.

The position of the double threaded helicoid is more or less the same as showed in this photo:



The copy version is a Made In Singapore, it can be different from Germany born one, as I only have this one, I guess the construction is the same, nut only guess.

The position of the smaller diameter helicoid, the one which focus near and far with greater displacement can be screwed until the end - don't force, instead clean and relube. The other helicoid is used for infinity focus, it can be assembled at middle way, don't pay to much attention now to it as the infinity will be adjusted later with the lens mounted.

following...

Renato


PostPosted: Thu Sep 11, 2014 8:02 pm    Post subject: Reply with quote

... continuing...

Placing the main lens group face down, just put the aperture ring over it, it's better if the small ball which clicks in the position of the aperture is placed at the upper metal cover in its hole - the one with a spring inside - instead on this ring. You can put a very small amount of grease for placement purposes.
The position of the aperture ring is with the point of its brass pin facing up, opposite side of the lens group.

After that, it's time to put the "metal cover" of the back of the lens. It has to have the pin of the wide open metering, and the track for focus helicoid displacement already fixed before. In the picture above we can see only the pin fixed but not the track, The track must be in place before fit.



Lens group and aperture ring fitted. The next step is to fit the metal back/cover.

... continue...


PostPosted: Thu Sep 11, 2014 9:02 pm    Post subject: Reply with quote

Fitting the metal back cover of this lens is maybe the trickiest part of the job. Many parts of the lens have to be perfectly aligned to permit the back to fit in the aperture ring and the main lens group. These parts are:

- brass metal plate of the aperture ring - fits on the aperture of the brass metal ring of the group opening blade plate,
- small ball bearing - already grease semi-fixed, goes in the right place when the position of the back plate is fitted,
- wide-opening pin - connects to the thin brass stick for wide open focus procedure,
- focus displacement track and,
- register pin at the aperture ring.

The less obvious, maybe, is the register pin at the aperture ring: it has to be positioned, aligned to the unique hole in the metal back in which doesn't fit a screw:

The register pin is at 7 o'clock in the right image bellow:



This pin must fit inside a hole in the metal back, which can be clearly seen at position 3 o'clock in the following pic:





... continue...


PostPosted: Thu Sep 11, 2014 10:53 pm    Post subject: Reply with quote

Going further:

If everything fits nicely, pushing a bit the metal back and turning the aperture ring you have to be able to listen the clicks of the ball bearing.

Now the second trick:

There are 3 screws to fix the metal back in its place. One of these screws is longer then the other two: is the "red" painted one in the previous pic.
This screw, being longer, has an un-threaded end. This end - crossing to the other side of the helicoid - will work as infinity stop when you turn the lens, as well as a near focus stop. If you place it anywhere else, fix the 3 screws in the front of the lens, the exact mark of infinity will be in another place of the barrel, not in its mark. Until you place the 3 screws in front of the lens and its brass ring, you'll not be able to turn the lens focus:



PostPosted: Thu Sep 11, 2014 11:01 pm    Post subject: Reply with quote

To adjust infinity focus is easy: Do it after the lens is completely assembled but not the front/name ring:

Loose the 3 screws by the front of the lens as showed in the previous picture.
Put the live view of the camera in 10X or more if possible and focus a distant point supposed to be in infinity focus region,
Without turning ( block it with your hand to not turn - the focus threaded barrel, turn gently the big metal ring with the distance marks carrying with this turn the register pin until reach infinity mark, tight the 3 screws. If infinity is a bi far or near the ideal point, repeat the procedure.

Doubts? Ask,

Cheers,

Renato Salles - RSalles


PostPosted: Thu Sep 11, 2014 11:13 pm    Post subject: Reply with quote

Thank you very much Renato, I will let you know how it goes.


PostPosted: Thu Sep 11, 2014 11:26 pm    Post subject: Reply with quote

Aanything wrote:
Thank you very much Renato, I will let you know how it goes.


Ok, Alessandro, glad to know it will be useful, if anything is not clear just ask,

Cheers,

Renato


PostPosted: Tue Feb 23, 2021 8:11 pm    Post subject: Reply with quote

RSalles wrote:
Alesandro,

I'm sending some pics showing the lens inside and try to explain how to re-assemble the lens back. Stay tunned,





Renato


After watching your image carefully, I just realized I ad set the inner helicoid upside down, thank you so much.