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Pentax Lens Disassembly Database
Posted By: Chaos_Realm, 03-22-2012, 05:04 PM

Hi all,
I have recently been on the hunt for dis-assembly guides for the purpose of dust removal etc. They seem to be turning up in various places across the forum, so I plan on creating a list of all the Pentax lens disassembly posts here. I will categorise each lens like they are in the 'lens database' and you should be able to see which lenses have a guide and which do not. If I come across multiple guides then I will list them all under that lens so there is coverage or alternative explanations. And hopefully with your help we will be able to put together a substantial resource for the DIYer's here, although I do realize some lenses will never have an owner brave enough to strip down themselves due to the shear value. I know this will take quite some time but I think it will be worth it. I have restricted time at this point but I want to get the ball rolling. So here is what we have:

NB: Currently this tread is only for Pentax K-Mount & M42 Screw-mount lenses. Maybe once this has developed a bit I might look at introducing other pentax Mounts and or third party lenses and permitting time (and success of this resource) a cleaning guide with tips on tools and techniques. I am trying not to bite off more than I can chew for the moment so we will just stick with lenses listed below.

Digital Era K-mount Lenses Film Era K-Mount Lenses
M42 Screw Mount Lenses


Last edited by Chaos_Realm; 04-22-2017 at 07:27 PM.
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05-28-2016, 10:00 AM   #106
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any idea where can i get AT_X tokina 80-200 2.8 disassembly guide, need to clean the lens deep inside

05-28-2016, 10:05 AM   #107
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I don't have a guide, but it likely follows the same general disassembly principles of most zooms. Is the fungus in front of or behind the aperture iris or both? And is it the AF or manual version?

QuoteOriginally posted by uttam.hathi Quote
any idea where can i get AT_X tokina 80-200 2.8 disassembly guide, need to clean the lens deep inside
05-28-2016, 02:23 PM   #108
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QuoteOriginally posted by uttam.hathi Quote
any idea where can i get AT_X tokina 80-200 2.8 disassembly guide, need to clean the lens deep inside
try the kiron kid home page and look under the vivitar maybe one of those manuals can help you. also be advised a lot of those Japanese lens makers were glue happy.
05-28-2016, 07:04 PM   #109
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@dcshooter haze and not the front glass, need to get inside to check if its decementing or some oil

05-29-2016, 12:55 PM   #110
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Is it this version?


If so, and if the haze is in front of the Iris, I'd start by removing the set screws just below the front ring. This will likely allow you to unscrew the front cell from the barrel. You can then likely proceed inward by removing the inner groups by removing the retaining rings that hold them in. The rings and screws will probably be held in with threadlocker, so applying a solvent like acetone or MEK before removing is advised.

If the haze is behind the iris, then you might be able to access the affected elements by removing the mount and unscrewing the rear groups. What might present problems is if the haze is affecting a floating interior group. If that's the case, you might have to remove it by disassembling the helical guides underneath the rubber grip.

If you have the AF pro version like this one, it doesn't appear to have grub screws, so it will probably be a little different to disassemble:
06-27-2016, 05:14 AM   #111
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Hello.
Does anybody know how to disassembly the front lens of a Sigma 24mm super-wide II? I believe that no differences exist between the MF and AF units.
Thanks in advance.
06-27-2016, 06:41 AM   #112
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I've done one of these before. It's pretty standard IIRC. Don't have one in front of me, but this might be one where the trim ring pries off rather than unscrews. Either way, it is a plastic piece, so more care is required than with typoical metal rings. Once under there, you can get access to the screws holding the barrel in and the front groups. You will porbably need solvent to remove threadlocker on the screw threads.
06-30-2016, 06:06 AM   #113
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QuoteOriginally posted by dcshooter Quote
I've done one of these before. It's pretty standard IIRC. Don't have one in front of me, but this might be one where the trim ring pries off rather than unscrews. Either way, it is a plastic piece, so more care is required than with typoical metal rings. Once under there, you can get access to the screws holding the barrel in and the front groups. You will porbably need solvent to remove threadlocker on the screw threads.
Thanks for the input. I feel discouraged about taking that ring off since I cannot see any space to use a lever, and I don't want to break anything. I just wanted to clean some little fungus on the inner part of the front lens.

08-06-2016, 08:05 AM   #114
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smc DA18-55mm F3.5-5.6 AL WR - disassemble the front glass

Hi,

I bought my first Pentax dslr about 4 years ago. It is a K-5 with 18-55mm kit lens. It has served me well all these years till recently when the lens started to has haze.
So I took the lens apart and found that the haze is actually on the front surface of this glass (see attached picture). And the glass is glued to the plastic structure.Does anyone know to separate them without causing irreversible damage?
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08-23-2016, 07:13 PM   #115
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Video on lens group disassembly for cleaning - Super Takumar 55mm f/1.8 lens

08-25-2016, 05:08 AM   #116
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QuoteOriginally posted by Not a Number Quote
Video on lens group disassembly for cleaning - Super Takumar 55mm f/1.8 lens

Fix Old Cameras: Pentax 55mm Lens - YouTube
Thanks for the link. Added to list. (Plus a couple of new videos on youtube I found that have been uploaded since I last checked)
08-25-2016, 08:01 AM   #117
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QuoteOriginally posted by Chaos_Realm Quote
Thanks for the link. Added to list. (Plus a couple of new videos on youtube I found that have been uploaded since I last checked)
Thanks for the new video links. I just acquired the 55mm f/1.8 Super Takumar with an oily aperture. Some of the videos show how to strip a Takumar down to clean the blades. I like the Fix Old Cameras vidoe I linked above because the presenter doesn't ramble on like most of these videos do. Most of the time I'm thinking "Get to the point" or "Pause or edit the lengthy process parts".

I'll have to look through that channel and see what other germs are in there.
09-18-2016, 08:00 PM   #118
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I just posted a quick description (with images) of how I took apart my Takumar 300mm f4 (3 element 1958 version) to check the infinity focus and re-grease the helical: https://www.pentaxforums.com/forums/58-troubleshooting-beginner-help/330052-d...958-model.html
11-24-2016, 08:53 AM   #119
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Anyone familiar with a SMC Pentax 1000mm f11 reflex lens? Got loads of dust on the rear filters, disassembled as much as I could see possible at the rear but no luck unfortunately.
11-24-2016, 09:22 AM   #120
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I;ve never handled that particular lens, but I've done a mirror lens with a similar rotating filter arrangement before (Kilfitt Reflectar perhaps? it was a while ago). If you post some pics of the rear as it stands now, I might be able to give you some tips on furthe rdisassembly.

QuoteOriginally posted by LayerCake Quote
Anyone familiar with a SMC Pentax 1000mm f11 reflex lens? Got loads of dust on the rear filters, disassembled as much as I could see possible at the rear but no luck unfortunately.
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