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

• DA Prime Lenses
  • SMC DA 14mm F2.8 ED [IF]
  • SMC DA 15mm F4 ED AL Limited
    • Repairing a damaged DA15 - PentaxForums.com
  • SMC DA 21mm F3.2 Limited
    • RiceHigh's Pentax Blog: Disassemble the DA21 Limited (and the Secret of the QSF Mechanism)
  • SMC DA 35mm F2.4 AL
  • SMC DA 35mm F2.8 Limited Macro
  • SMC DA 40mm F2.8 Limited
    • Pentax DA40 Limited repair @ iMGSRC.RU
  • SMC DA 50mm F1.8
  • SMC DA 70 F2.4 Limited
  • SMC DA 560mm F5.6
  • SMC DA* 55mm F1.4 SDM
  • SMC DA* 200mm F2.8 ED [IF] SDM
  • SMC DA* 300mm F4 ED [IF] SDM
• DA Zoom Lenses
  • SMC DA 10-17mm F3.5-4.5 Fish-Eye ED [IF]
  • SMC DA 12-24mm F4 ED AL [IF]
  • SMC DA 16-45mm F4
  • SMC DA* 16-50 F2.8 ED AL [IF] SDM
    • DIY SDM repair v1.0
    • https://www.pentaxforums.com/forums/attachments/114-maintenance-repair-artic...-al-if-sdm.pdf
  • SMC DA 17-70 F4 AL [IF] SDM
  • SMC DA 18-55mm F3.5-5.6 AL
  • SMC DA 18-55mm F3.5-5.6 AL II
    • Pentax 18-55 DA II Disassembly/Reassembly - a set on Flickr
  • SMC DA 18-55mm F3.5-5.6 AL WR
  • SMC DA 18-135mm F3.5-5.6 ED AL [IF] DC WR
  • SMC DA 18-250mm F3.5-6.3 ED AL [IF]
  • SMC DA 50-200mm F4-5.6 ED
  • SMC DA 50-200mm F4-5.6 ED WR
    • Lens disassembled and with a problem: SMC Pentax-DA L 50-200mm F4-5.6 ED WR - YouTube
    • Disassemble front element of zoom lens SMC DA 50-200mm WR - PentaxForums.com
  • SMC DA 55-300mm F4-5.8 ED
  • SMC DA* 50-135mm F2.8 ED [IF] SDM
  • SMC DA* 60-250mm F4 ED [IF] SDM
• DA L Zoom Lenses
  • SMC DA L 18-55mm F3.5-5.6 AL
    • RiceHigh's Pentax Blog: Disassemble a DAL 18-55
  • SMC DA L 50-200mm F4-5.6 ED
  • SMC DA L 55-300mm F4-5.8 ED
• D FA Prime Lenses
  • SMC D FA 50mm F2.8 Macro
  • SMC D FA 100mm F2.8 Macro
  • SMC D FA 100mm F2.8 Macro WR
• DA XS Prime Lenses
  • SMC DA 40mm F2.8 XS

Film Era K-Mount Lenses

• FA Prime Lenses
  • SMC FA 20mm F2.8
  • SMC FA* 24mm F2 AL [IF]
  • SMC FA 28mm F2.8 AL
  • SMC FA 28 F2.8 Soft
  • SMC FA 31mm F1.8 AL Limited
    • (Password: "Pentax") Exploded Diagram - http://www.pentax-manuals.com/manuals/service/fa31.pdf
  • SMC FA 35mm F2 AL
  • SMC FA 43mm F1.9 Limited
  • SMC FA 50mm F1.4
    • FA50 disassembly and infinity focus adjustment - PentaxForums.com
  • SMC FA 50mm F1.7
  • SMC FA 50mm F2.8 Macro
  • SMC FA 77mm F1.8 Limited
    • (Password: "Pentax") Exploded Diagram - http://www.pentax-manuals.com/manuals/service/77mm_parts.pdf
  • SMC FA* 85mm F1.4 [IF]
  • SMC FA 85mm F2.8 Soft
  • SMC FA 100mm F2.8 Macro
  • SMC FA 100mm F3.5 Macro
  • SMC FA 135mm F2.8 [IF]
  • SMC FA* 200mm F2.8 ED [IF]
    • http://www.pentax-manuals.com/manuals/service/fa200.pdf
  • SMC FA* 200mm F4 Macro ED [IF]
  • SMC FA* 300mm F2.8 ED [IF]
  • SMC FA* 300mm F4.5 ED [IF]
  • SMC FA* 400mm F5.6 ED [IF]
  • SMC FA* 600mm F4 ED [IF]
• FA Zoom Lenses
  • SMC FA 20-35mm F4 AL
  • SMC FA 24-90mm F3.5-4.5 AL [IF]
  • SMC FA* 28-70mm F2.8 AL
  • SMC FA 28-70mm F4 AL
    • I (fully) dismounted my FA 28-70/4 !! Part I: Pentax SLR Talk Forum: Digital Photography Review
  • SMC FA 28-80mm F3.5-4.7
  • SMC FA 28-80mm F3.5-5.6
  • SMC FA 28-80mm F3.5-5.6 AL
  • SMC FA 28-90mm F3.5-5.6
  • SMC FA 28-105mm F3.2-4.5 AL [IF]
  • SMC FA 28-105mm F4-5.6
  • SMC FA 28-105mm F4-5.6 [IF]
  • SMC FA 28-200mm F3.8-5.6 AL [IF]
  • SMC FA 35-80mm F4-5.6
  • SMC FA 70-200mm F4-5.6
  • SMC FA* 80-200mm F2.8 ED [IF]
  • SMC FA 80-200 F4.7-5.6
  • SMC FA 80-320 F4.5-5.6
  • SMC FA 100-300mm F4.5-5.6
  • SMC FA 100-300mm F4.7-5.8
  • SMC FA* 250-600mm F5.6 ED [IF]
• FA J Zoom Lenses
  • SMC FA J 18-35mm F4-5.6
  • SMC FA J 28-80mm F3.5-5.6 AL
  • SMC FA J 75-300mm F4.5-5.8 AL
• F Prime Lenses
  • SMC F 28mm F2.8
  • SMC F 50mm F1.4
  • SMC F 50mm F1.7
  • SMC F 50mm F2.8 Macro
  • SMC F 85mm F2.8 Soft
  • SMC F 100mm F2.8 Macro
  • SMC F 135mm F2.8 [IF]
  • SMC F* 300mm F4.5 ED [IF]
    • Pentax F* 300 4.5 disassembly | Flickr
  • SMC F* 600mm F4 ED [IF]
• F Zoom Lenses
  • SMC F 17-28mm F3.5-4.5 Fish-Eye
  • SMC F 24-50mm F4
  • SMC F 28-80mm F3.5-4.5
    • RiceHigh's Pentax Blog: Disassemble the Old Takumar-F 28-80 Zoom Lens
  • SMC F 35-70mm F3.5-4.5
  • SMC F 35-80mm F4-5.6
  • SMC F 35-105mm F4-5.6
  • SMC F 35-135mm F3.5-4.5
  • SMC F 70-210mm F4-5.6
    • Pentax 70-210 Repair
    • Pentax-F 70-210mm - PentaxForums.com
  • SMC F 80-200mm F4.7-5.6
  • SMC F 100-300mm F4.5-5.6
  • SMC F* 250-600mm F5.6 ED [IF]
• A Prime Lenses
  • SMC A 15mm F3.5
  • SMC A 16mm F2.8 Fish-Eye
  • SMC A 20mm F2.8
  • SMC A 24mm F2.8
  • SMC A 28mm F2
  • SMC A 28mm F2.8
  • SMC A 35mm F2
  • SMC A 35mm F2.8
  • SMC A 50mm F1.2
  • SMC A 50mm F1.4
  • SMC A 50mm F1.7
    • How to Remove Fungus: A 50mm F1.7 lens - PentaxForums.com
    • Pentax 50mm lens fix
    • (Password: "Pentax") Exploded Diagram - http://www.pentax-manuals.com/manuals/service/smca5017.pdf
    • Pentax-A 50mm f1.7 Aperture ring repair - PentaxForums.com
  • SMC A 50mm F2
    • Youtube Video
  • SMC A 50mm F2.8 Macro
  • SMC A* 85mm F1.4
  • SMC A 100mm F2.8
  • SMC A 100mm F2.8 Macro
  • SMC A 100mm F4 Macro
  • SMC A* 135mm F1.8
  • SMC A 135mm F2.8
  • SMC A* 200mm F2.8 ED
  • SMC A 200mm F4
  • SMC A* 200mm F4 Macro ED
  • SMC A* 300mm F2.8 ED [IF]
  • SMC A* 300mm F4
    • A* 300mm disassembly/cleaning guide - PentaxForums.com
  • SMC A* 400mm F2.8 ED [IF]
  • SMC A 400mm F5.6
  • SMC A* 600mm F5.6 ED [IF]
  • SMC A* 1200mm F8 ED [IF]
• A Zoom Lenses
  • SMC A 24-50mm F4
  • SMC A 28-80mm F3.5-4.5
  • SMC A 28-135mm F4
  • SMC A 35-70mm F3.5-4.5
  • SMC A 35-70mm F4
  • SMC A 35-80mm F4-5.6
  • SMC A 35-105mm F3.5
  • SMC A 35-135mm F3.5-4.5
  • SMC A 35-210mm F3.5-4.5
  • SMC A 70-210mm F4
  • SMC A 80-200mm F4.7-5.6
• M Prime Lenses
  • SMC M 20mm F4
  • SMC M 28mm F2
  • SMC M 28mm F2.8
    • SMC PENTAX-M 1:2.8 28mm version 1 disassembly.
  • SMC M 28mm F3.5
  • SMC M 35mm F1.4
  • SMC M 35mm F2
  • SMC M 35mm F2.8
    • SMC PENTAX-M 1:2.8 35mm disassembly.
  • SMC M 40mm F2.8
  • SMC M 50mm F1.4
    • (non-English) M50 1.4
    • Youtube video dissassembly
  • SMC M 50mm F1.7
  • SMC M 50mm F2
    • Pentax 50mm repair 1
    • Youtube video
      
  • SMC M 50mm F4 Macro
  • SMC M 85mm F2
    • Disassemble SMC Pentax-M 85mm 1:2______Picture slide show - YouTube
  • SMC M 100mm F2.8
  • SMC M 100mm F4 Macro
  • SMC M 120mm F2.8
  • SMC M 135mm F3.5
    • Youtube Video
  • SMC M 150mm F3.5
  • SMC M 200mm F4
    • Pentax M 200/4 repair - wiratama.net
  • SMC M* 300mm F4
  • SMC M 400mm F5.6
  • SMC M Reflex 2000mm F13.5
• M Zoom Lenses
  • SMC M 24-35mm F3.5
  • SMC M 24-50mm F4
  • SMC M 28-50mm F3.5-4.5
  • SMC M 35-70mm F2.8-3.5
  • SMC M 40-80mm F2.8-4
  • SMC M 75-150mm F4
  • SMC M 80-200mm F4.5
• K Prime Lenses
  • SMC K 15mm F3.5
  • SMC K 17mm F4 Fish-Eye
  • SMC K18mm F3.5
  • SMC K 28mm F3.5
  • SMC K 20mm F4
  • SMC K 24mm F2.8
  • SMC K 24mm F3.5
  • SMC K 28mm F2
  • SMC K 28mm F3.5
    • Pentax K 28mm F3.5 Disassembly for cleaning - PentaxForums.com
  • SMC K 28mm F3.5 Shift
  • SMC K 30mm F2.8
  • SMC K 35mm F2
  • SMC K 35mm F3.5
  • SMC K 50mm F1.2
    • Pentax K 1.2/50mm Disassembly pics - PentaxForums.com
  • SMC K 50mm F1.4
  • SMC K 50mm F4 Macro
  • SMC K 55mm F1.8
  • SMC K 55mm F2
  • SMC K 85mm F1.8
  • SMC K 85mm F2.2 Soft
  • SMC K 100mm F4 Bellows
  • SMC K 100mm F4 Macro
  • SMC K 105mm F2.8
  • SMC K 120mm F2.8
  • SMC K 135mm F2.5
  • SMC K 135mm F3.5
  • SMC K 150mm F4
  • SMC K 200mm F2.5
    • How to fix infinity focus on K 200mm f2.5 - PentaxForums.com
  • SMC K 200mm F4
  • SMC K 300mm F4
  • SMC K 400mm F5.6
  • SMC K 500mm F4.5
  • SMC K 1000mm F8
  • SMC K Reflex 1000mm F11
  • SMC K Reflex 2000mm F13.5
• K Zoom Lenses
  • SMC K 28-50mm F3.5-4.5
  • SMC K 45-125mm F4
  • SMC K 80-200mm F4.5
  • SMC K 85-210mm F3.5
  • SMC K 85-210mm F4.5
  • SMC K 135-600mm F6.7
  • SMC K Reflex 400-600mm F8-12
• Non SMC Prime Lenses
  • Takumar A 28mm F2.8
  • Takumar 28mm F2.8 Bayonet
  • Takumar 135mm F2.5 Bayonet
  • Takumar 135mm F2.8 Bayonet
• Non SMC Zoom Lenses
  • Pentax A 28-80mm F3.5-4.5
  • Pentax F 28-80mm F3.5-4.5
  • Takumar A 28-80mm F3.5-4.5
  • Takumar F 28-80mm F3.5-4.5
  • SMC Pentax AF 35-70mm F2.8
  • Pentax A 70-200mm F4
  • Takumar A 70-200mm F4-5.6
  • Takumar F 70-200mm F4-5.6
  • Takumar F 70-210mm F4-5.6
  • Takumar A 70-210mm F4-5.6
  • Takumar 80-200mm F4.5 Bayonet

M42 Screw Mount Lenses

• Extreme Wide-Angle Primes
  • SMC Takumar 15mm F3.5
  • SMC Takumar 17mm F4 Fish-eye
    • Fish Eye Takumar 17/4 - wiratama.net
  • Takumar 18mm F11 Fish-eye
  • SMC Takumar 20mm F4.5
  • SMC Takumar 24mm F3.4
• Wide-Angle Primes
  • SMC Takumar 28mm F3.5
    • Youtube video Part 1
    • Youtube Video Part 2
    • Youtube Video Part 3
  • SMC Takumar 35mm F2
  • Auto Takumar 35mm F2.3
  • SMC Super Auto Takumar 35mm F3.5
    • Takumar Super Multi Coated 35/3.5 disassembly - wiratama.net
    • Auto-Takumar 35mm 3.5 Rebuild - YouTube
  • Takumar 35mm F4
    • http://pentax-manuals.com/repairs/takumarlens_s.pdf
• Normal Primes
  • Super Takumar 50mm F1.4 (Early 8-Element Variant)
  • SMC Takumar 50mm F1.4
    • http://homepages.ihug.co.nz/~Srawhiti/pentax50mmf1.4.html
  • SMC Macro Takumar 50mm F4
    • Repairing a Takumar 50mm f4 Macro - PentaxForums.com
  • SMC Auto Takumar 55mm F1.8
    • Takumar 55mm disassembly guide for regreasing - PentaxForums.com
    • Youtube Video
  • Auto Takumar 55mmF1.9
  • Takumar 55mm F2
    • Super Takumar 55/2 disassembly - PentaxForums.com
  • Auto Takumar 55mm F2.2
  • Takumar 55mm F2.2
  • Takumar 58mm F2
  • Takumar 58mm F2.4
• Telephoto Primes
  • Takumar 83mm F1.9
  • SMC Auto Takumar 85mm F1.8
  • SMC Takumar 85mm F1.9
    • JB Media | S-M-C Takumar 1.9 85mm Refurbish
  • Quartz Takumar 85mm F3.5
  • Ultra Achromatic Takumar 85mm F4.5
  • Takumar 100mm F2
  • Takumar 100mm F3.5
  • SMC Bellows Takumar 100mm F4
  • SMC Takumar 100mm F4 Macro
  • Auto Takumar 105mm F2.8
  • SMC Takumar 105mm F2.8
  • SMC Takumar 120mm F2.8
  • SMC Takumar 135mm F2.5
  • SMC Takumar 135mm F3.5
    • Favorite Classics / Pentax Super Takumar f/3.5 135mm
  • Auto Takumar 135mm F3.5
  • SMC Takumar 150mm F4
  • Takumar 200mm F3.5
  • SMC Takumar 200mm F4
    • asahisuper-takumar200mmf4 - davidimagephotography
  • Takumar 200mm F5.6
  • SMC Takumar 300mm F4
  • Takumar 300mm F4 (1958)
    • Disassembly and Re-greasing of a Takumar 300mm F4 (3-element, 1958 model) - PentaxForums.com
  • Takumar 300mm F4 (1962)
  • Aultra Achromatic Tkumar 300mm F5.6
  • Takumar 300mm F6.3
    • JB Media | Tele-Takumar 6.3 300mm
• Extreme Telephoto Primes
  • SMC Takumar 400mm F5.6
  • SMC Takumar 500mm F4.5
  • Takumar 500mm F5
  • SMC Takumar 1000mm F8
• Zooms
  • SMC Takumar 45-125mm F4
  • SMC Takumar 70-150mm F4.5
  • SMC Takumar 85-210mm F4.5
  • SMC Takumar 135-600mm F6.7

[barbosas]

Thanks for sharing this, might be useful somewhere down the road.

[tim60]

I have recently acquired a Super Takumar 300/f4 which is missing the auto/manual switch. The externally visible switch is missing (and obviously the internal non-visible section of the same part.)

Does anyone have a picture of (photo, exploded lens repair manual or technical drawing) of the Auto/Manual switch part which is missing?

I am thinking of fabricating a part to replace it but life would be much easier if I can see what shape to original part is and if there are things it is meant to connect to.

I will also put this post on Takumar Club.

[RedMist]

Does anyone have experience of disassembling a DA 40mm Ltd lens?

I need to fix the infinity focusing which no longer works beyond 25m on my K-30.

Would like to try and repair it myself first if possible so any advice would be appreciated before I give up and take it to a specialist.

I've seen a guide on fixing the same issue on the 21mm Ltd so I assume it is similar but I'm not sure if I need to remove the name ring or not which I am struggling to do at the moment (need to find a proper rubber ring perhaps). The smaller ribbed centre section around the lens opening within the name ring can be removed and reveals 3 little screws but I'm not sure if there are more screws lurking under the name ring. Maybe the name ring on the 40mm doesn't remove as it does on the 21mm due to the smaller lens opening and therefore different design?

TIA

[TropicalMonkey]

Disassemble a DAL 18-55

Original link is in this article
RiceHigh's Pentax Blog: Disassemble a DAL 18-55

English translation here:
Google Translate

[Louarn]

Hello,

I encounter an issue on my pentax A 28-80 lens (on a P30T).
Here are some pics: I think that a spider was inside and make its net !


I remove the front bezel with the cap of a shaving foam spray.
Then the lens came, more or less easily. A suction pad can help (look in the bathroom !)


On the back side, I remove the screws with difficulties; one has to be drilled.
Then unscrew the lens, and the bezel. No real difficulties neither.


The only big issue was with the pin which indicate the automatic mode for the aperture.
This small §#$! pin jump out off the lens, as it is only locked by the big bezel !
Once this one is removed, it stand in place thanks to the hand of God, in my opinion.



I spent nearly 2 hours to put it back in place.
So if you have to disassemble the lens, take care to block this pin (with some tape or blue tag for example).



By the way, I clean up all the lens, and the result is very fine now.

[tim60]

Hello,

I encounter an issue on my pentax A 28-80 lens (on a P30T).
Here are some pics: I think that a spider was inside and make its net !

It is more likely your lens suffered from fungus. That is how the kind of fungus that grows in lenses looks.

[glasbak]

M28/2.8 and M35/2.8 Here

[tim60]

Could someone advise where to buy JIS screw drivers of suitable sizes for maintenance of the old Super Takumar lens (and similar series).

Must be a vendor willing to ship to Australia.

[kcobain1992]

Super Takumars use flat screws. For others, I got a set of 4 Moody screwdrivers from ebay (the same seller don19470 that has them now).

[tim60]

Super Takumars use flat screws. For others, I got a set of 4 Moody screwdrivers from ebay (the same seller don19470 that has them now).

Thanks Vlad.

I am sure I have seen some of these screw heads in my Taks and certainly read about them.

[tim60]

Super Takumars use flat screws. For others, I got a set of 4 Moody screwdrivers from ebay (the same seller don19470 that has them now).

Vlad, thanks. I found the e
Bay seller. And then though i might use an Amazon ift card I was sent fro a minor job I did for soemone. I sources Moody JIS drivers from an Amazon supplier, including postage to Australia, but 4 blades (same sizes) and one interchangeable handle for just less thant he eBay seller had them.

And now what to do with the remaining $8.75 on the gift card?

Awaiting delivery to my office.

[Roland Karlsson]

Here is a good tutorial how to disassemble a Pentax-M 28 F2.8

SMC PENTAX-M 1:2.8 28mm version 1 disassembly.

[Chaos_Realm]

Disassemble a DAL 18-55

Original link is in this article
RiceHigh's Pentax Blog: Disassemble a DAL 18-55

English translation here:
Google Translate

M28/2.8 and M35/2.8 Here

Here is a good tutorial how to disassemble a Pentax-M 28 F2.8

SMC PENTAX-M 1:2.8 28mm version 1 disassembly.

These have been added to the list,
Thanks for the input guys. Sorry i took so long to get them on there

[Jean Poitiers]

Bonjour,

Thanks ... just what I needed ... have already quickly cleaned the front elements ... merci !

• SMC Takumar 200mm F4
  • asahisuper-takumar200mmf4 - davidimagephotography

Salut, J

[blackest]

50mm ka f2.0 this was fairly easy to clean partly anyway. The inside front is a friction fit and can be unscrewed anti clockwise once this is removed 3 screws are visible unscrewing these takes of the front housing with the filter ring under this is a brass ring held by 3 screws unscrew this the front element comes out access to the inside of the rear element can be gained carefully through the aperture. The front element assembly has 2 pieces of glass with finger nails i was able to anti clockwise unscrew the retaining ring giving me bare glass front element and access to the inside of the rear face. reassembly is just the reverse and pretty difficult to get wrong. I think its possible to separate the rear element pair from the back but it was too tight for me so i left it with 99% of the fungus removed already I didn't see a need to go further. Pretty easy and it all fits together with no problems.