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Playing around with a stock 18-55 and a Sigma 70-300 ...
Now, with an SMC Takumar 105 and a CZJ Flektogon 35 too ...

Wednesday, May 14, 2008

Cleaning a Flektogon 35mm (chrome barrel) ... (2/3)

... Continued from previous post.

7. I focused on infinite the lens, fully opened the diaphragm (don't know if required, but, just in case of ...), and started to unscrew the outer ring ... For safety reasons, instead of fixing the lens and turning the compass, i hold the compass strongly, and turned the lens on its rear cap, to be sure i didn't scratch the front element ...
07 - IMGP4712

8. The lens open-hearth near its front cell ...
08 - IMGP4724

9. The front cell, where the sick lens is, side view ...
09 - IMGP4727

10. Just in case, since it was accessible, i checked the diaphragm blades, wide open ...
10 - IMGP4730

11. ... and fully stopped down: no oil traces - maybe the lens was really quite in "mint conditions" ?
11 - IMGP4732

12. Believing that the element to be cleaned was at the bottom of the front cell, i started cleaning at first with an optical lens cleaning fluid and a micro-fiber cloth ...
12 - IMGP4734

13. ... then i ended up with the big gun, Zippo fluid ...
13 - IMGP4737

After that, i realized that the haze was somewhere inside the front cell, so i managed to disassemble it ... I noticed a screw thread at the bottom of the front cell, so:

14. I unscrewed the rear ring of the front cell, to extract the rear group ...
14 - IMGP4740

15. The rear ring removed, notice that the rear group is not glued on the ring, but it is still in the bottom of the front cell ...
15 - IMGP4741

16. I turned upside down the front cell, and the rear group felt in my hand. Here it lies in the rear ring on the right ...
16 - IMGP4743

17. I noticed that the front cell contained the front element, but also a middle one (where, according to the Murphy's law, the haze was, aaaaaaaaagh!) ...
17 - IMGP4746

18. ... so i had to remove the front element, too. Again, with the "spanner wrench", i unscrewed the retaining ring - remember, there where two rings on the front cell ... and be REALLY CAREFUL HERE! It's easy to scratch the front lens ...
18 - IMGP4752

19. The front cell, with the lens front element and its retaining ring ... The dirty element was the one still in the front cell, so i cleaned it with the Zippo fluid first, and the lens cleaner liquid after, using some "Cotton fiocs" (sorry, don't know the english name) you can see on the right and the micro fiber cloth after ...
19 - IMGP4754

20. The front cell, almost totally disassembled - no need to remove the middle element from the cell, it's easily accessed for cleaning on both sides ...
20 - IMGP4757

To be continued. Click here for the last part ...

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4 Comments:

Anonymous Anonymous said...

"Cotton fiocs" are usually given the name of the biggest brand in the US, Q-tip. In Britain they seem to be called cotton buds.

May 18, 2008 at 9:31 PM  
Blogger IndianaDinos said...

Hi, thanks for the hint.

May 19, 2008 at 12:36 AM  
Anonymous Anonymous said...

Thx a lot for the tuto... you helped me save a Lens :)
I came out of optical paper while cleaning so i've used "silk paper" instead... worked like a, charm... and "silk paper" is much cheaper.

April 27, 2013 at 2:23 PM  
Anonymous Anonymous said...

Hi there,
I've got the same problem on my Flek but can't unscrew the rear lens from the front cell.
I tried to loosen it by soaking the threads with alcohol, but it's all stuck. Unfortunately there are no holes in the rear element housing.
Any ideas?
Thanks,
Nick

August 8, 2014 at 10:21 PM  

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