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Carl Zeiss Planar 50mm F/1.4 C/Y - oil on aperture blades
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PostPosted: Thu Oct 02, 2014 5:06 pm    Post subject: Carl Zeiss Planar 50mm F/1.4 C/Y - oil on aperture blades Reply with quote
Hello everyone,

received few days ago, CZ Planar 50/1.4 in C/Y mount, the lens is in pretty good shape and i'm planing to replace my canon ef 50/1.4 with it. However i do notice few oil marks on aperture blades. Blades are responsive however and do not stick, but i still would rather not have oil on them. I did search, and seems that this particular lens does suffer from oil on blades a lot. There are vids and tutes on how to clean but, i'm bit concerned about disassembling the entire unit. So i was thinking about removing front and rear glass units, and cleaning the blades with q-tips (swabs) - this seems easy and comfortable enough to do.

Would you recommend any cleaning fluid that will remove oil and dry out/evaporate so i don't have to wipe the blades?


PostPosted: Thu Oct 02, 2014 7:16 pm    Post subject: Reply with quote
The blades can be cleaned with a cotton swab lightly moistened with acetone. I do not believe, however, that the cleaning will be definitive. The oil will probably return. To understand better, take a look at my comments in this thread:

http://forum.mflenses.com/canon-fd-aperture-cleaning-t67963.html


PostPosted: Thu Oct 02, 2014 8:31 pm    Post subject: Reply with quote
Gerald wrote:
The blades can be cleaned with a cotton swab lightly moistened with acetone. I do not believe, however, that the cleaning will be definitive. The oil will probably return. To understand better, take a look at my comments in this thread:

http://forum.mflenses.com/canon-fd-aperture-cleaning-t67963.html


Interesting. Thanks Gerald.

I do notice that blades are only oiled on back side. Front side is dry and clean. Will acetone leave any residue?


PostPosted: Thu Oct 02, 2014 9:00 pm    Post subject: Reply with quote
Jvg wrote:
Will acetone leave any residue?

Acetone evaporates completely and should not leave residues. If any stain is left over after the acetone evaporates, repeat the cleaning process on site of the stain. Use the purest acetone you find.


PostPosted: Fri Oct 03, 2014 6:37 am    Post subject: Reply with quote
Be careful with acetone, it easily dissolves most plastics it comes in contact with. Petroleum-based solvents, like lighter fluid, generally dissolve grease better than acetone (which is more polar, i.e. less chemically similar to the grease). I use household naphta to clean aperture blades. Usually, I drip it onto the blades and open/close the aperture a few times (to get the naphta into the aperture mechanism and not just the surface of the blades). I then dry it off with lint free paper (q-tips/earbuds can leave cotton fibres behind) and finally blow dry with a Rocket blower (while also opening/closing the blades). This is usually enough to get the job done. I check for dryness by smelling; if the smell of gasoline is gone, it's completely evaporated.


PostPosted: Fri Oct 03, 2014 12:54 pm    Post subject: Reply with quote
Thank you Gerald & Sceptic.
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