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Pentax K 1.2/50mm Disassembly pics
Posted By: Sliver-Surfer, 11-09-2014, 12:37 PM

I wanted to remove haze from this lens and I documented the various stages It so I could put it back together. notice my work surface no screws escaping here

































Remove rubber grip and unscrew flanged ring in front of grip to access front elements(not Descriptive beauty ring on lens face)



Remove screws hidden by this ring



lift of the ring after screws removed and when this is done you can then access the front elements by unscrewing the descriptive beauty ring








Last edited by Sliver-Surfer; 11-09-2014 at 01:47 PM.
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11-09-2014, 01:25 PM   #2
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Thanks for taking the time to post this. Always appreciate great reference material like this on the he forum!
11-09-2014, 01:45 PM   #3
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Just how scary is that...

I'll leave anything that needs doing like that in the future, to the hands of the professionals.
11-09-2014, 01:54 PM   #4
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QuoteOriginally posted by Kerrowdown Quote
Just how scary is that...

I'll leave anything that needs doing like that in the future, to the hands of the professionals.
Haha thats why I took pictures. My motto is how do you know you can't fix it if you don't try.
Video or photograph yourself doing it..I videoed as well but too much cursing.

11-09-2014, 04:43 PM   #5
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Yikes! You're braver than me! Thanks for posting.
11-09-2014, 04:49 PM   #6
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I don't know for sure that I would have tried that, but its nice to have the pictorial instructions.

11-09-2014, 06:44 PM   #7
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QuoteOriginally posted by interested_observer Quote
I don't know for sure that I would have tried that, but its nice to have the pictorial instructions.

It's not the taking apart that's the hard part with anything, I find - It's the putting back together! I often have spares left over!
11-10-2014, 06:54 AM   #8
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Do we get photos of the rest of the process? Were you able to successfully remove the haze?

11-10-2014, 08:07 AM   #9
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QuoteOriginally posted by narual Quote
Do we get photos of the rest of the process? Were you able to successfully remove the haze?
I did remove the haze. It was condensed oil on the elements from evaporated lubricant. I did not take pictures of the element cleaning because it was a simple process and my intent was to create a photo map of how to put it back together..sorry. I used 99% isopropl alcohol, microfibre cloth and compressed air to clean it.
11-10-2014, 04:32 PM   #10
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If you're fixing up nicer lenses like these, you might want to consider getting some lab-grade alcohol (99.99%). I've had trouble with impurities on 99% grade. Higher grade stuff doesn't cost much and can reduce the time it takes to get the elements really clean. http://www.amazon.com/MG-Chemicals-Isopropyl-Alcohol-Cleaner/dp/B005DNQX3C

Thanks for sharing! much appreciated!
11-16-2014, 10:29 AM   #11
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My two cents as someone who cleans a lot of lenses:

If you've stripped a lens down to this level, the best way to clean barrel parts off is gentle scrubbing with warm water, dish detergent, and a soft toothbrush. Organic solvents like alcohol, etc. can strip off engraving paints. This process also works quite well to remove helical grease, for which hotter water can be used.

Unpainted interior mechanics can be soaked in pure acetone. Just don't leave steel parts in there too long, as acetone is hydrophilic and can cause rust. For aperture blades and other painted surfaces, I find the most effective and relatively safe cleaner is naptha (e.g. Ronsonol or Zippo lighter fluid). It evaporates quickly without residue and is not as toxic as some of the other volatile cleaners others use.

Naptha also makes an extremely effective lens surface cleaner in conjunction with clean microfiber cloths, as it does not attack modern coatings (if you are using a 1950's or older lens, be very careful with any solvents or cleaning, since the coatings can be quite soft, particularly interior ones), and is very effective at removing oily residue.

Avoid using naptha on assembled lenses, however, as it can migrate quite easily into the interior and carry impurities it has dissolved with it.

As with any organic solvents, use naptha in a well-ventilated area only.

Alcohol is a cleaner that is perhaps good for many cleaning applications, but is not really great for any.

QuoteOriginally posted by jbondo Quote
If you're fixing up nicer lenses like these, you might want to consider getting some lab-grade alcohol (99.99%). I've had trouble with impurities on 99% grade. Higher grade stuff doesn't cost much and can reduce the time it takes to get the elements really clean. http://www.amazon.com/MG-Chemicals-Isopropyl-Alcohol-Cleaner/dp/B005DNQX3C

Thanks for sharing! much appreciated!
11-16-2014, 12:24 PM   #12
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QuoteOriginally posted by dcshooter Quote
Alcohol is a cleaner that is perhaps good for many cleaning applications, but is not really great for any.
Agreed. And thanks for the recommendation on naptha. It's one of the few solvents I've not used.
11-17-2014, 07:16 AM   #13
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I just got my copy of this linse, it has a single tiny hair inside, i newer noticed it on pictures so i will keep this post, if one day i will deassemple it
My lens also have some damage om the front lens thread, but overall in good shape
11-17-2014, 07:55 AM   #14
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@Thor: Can ytou tell which element the hair is on? Is it behind or in front of the aperture blades? With luck, you might be able to do only the front disassembly, which is somewhat easier.
01-02-2015, 12:10 AM   #15
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Thanks silly surfer, I will try to get this added to the disassembly database thread for you.
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