Need help repairing a planar 50mm 1.4

eddie3dfx · Joined: 12 Sep 2013 Posts: 9

I picked up a planar 50mm 1.4 from someone with the sale based on the sale that the aperture was stuck wide open.

I took the back apart to take a look at the aperture blades.

In the picture that I shown, I wanted to confirm that 1 goes to 1 and 2 goes to 2.
How and where does level 2 on the top with shim connect into the assembly. (to left of assembly 2, to the right of it, or clicked into it somehow.. is there a spring that's missing?)

The reason why I ask this is because level one opens and closes the aperture with little effort. I'm assuming this means it's not stuck from grim/grease but something else that is wrong.

I put a question mark in where lever 1 moves the aperture but seemingly goes to far leaving it wide open (which I believe is what's happening.

Any ideas? I am at a loss

I looked at pictures of other peoples repairs but it was hard to see the inner workings of where these levers were and what moved what.

I also attached 2 videos (vimeo takes 20 mins to upload, so if it doesn't work, it will shortly)

http://postimg.org/image/xil8oyyjp/
http://postimg.org/image/df1mcx6jp/

https://vimeo.com/74398712

https://vimeo.com/74398711

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Nordentro · Expire: 2015-01-29

eddie3dfx · Joined: 12 Sep 2013 Posts: 9

Thank you, not sure why I have such a hard time uploading pics Shocked

Nordentro · Expire: 2015-01-29

eddie3dfx · Joined: 12 Sep 2013 Posts: 9

I have come to the conclusion it's one of two things.
I kind of ghetto wedged a tighter spring in between the hole and the plastic piece. It now snaps back to f4 through F1.4.
So either the original spring has lost tension or .. the aperture blades are dirty causing the loss of spap back... It's hard to tell because I thought I could solve this with just pulling the back apart.. No, i'll have to do a full clean.
I misunderstood the mechanics of the lens... I must be cleaned..

Besides lighter fluid, what can I use to clean the barrel, components? What kind of grease do you use on the threads?

Clarkee · Joined: 25 Sep 2013 Posts: 2 Location: United Kingdom

It only takes a tiny bit of oil to stop an aperture working.
Just think how much tension is on that tiny spring?
And how much tension your fat fingers can exert? (No offence meant).
Take all the glass out & flood clean it. With lighter fluid.
Unsure if this can be done without taking the helicoids apart.
(Make a note of exactly where they come apart on dissassembly!)
I use Silicon grease for O rings etc.
but some people say it is unsuitable. Different lenses do require difference grease Viscositys.
Molybdenum Disulfite is also popular.
Depending on tolerances, I assume the grease you would need for a Zeiss is quite thin.
Is it Contax/Yashica mount?
I have one but never stripped it down.

Lloydy · Expire: 2022-01-01

eddie3dfx · Joined: 12 Sep 2013 Posts: 9

Had to send it in to get the aperture cleaned. I couldn't get the front unscrewed (zeiss puts a tab of glue to hold it in)
Didn't want to break it and I felt the price was reasonable enough to get it cleaned.
Yeah, the aperture blades were dirty and he said the top piece holding it in was also screwed on too tight, which caused it to be too tight as well.