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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; 1 Day Ago at 02:23 AM.
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10-28-2015, 04:22 PM   #91
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I saw a thread around here once where someone had fashioned one out of some thin wire and had success with it. If you post a pic, I might be able to tell if it's interchangeable with one from a different model (and possibly send one if it is ).

QuoteOriginally posted by markoneswift Quote
Hey mate, I've received the lens now and discovered two things - firstly, it has to be torn down from the back, so all the mount electronics etc need to be removed and secondly the 'information relay fork' is mashed. The fork has three of five pins screwed so I need to try and find a replacement......any ideas on how I go about that ? I've emailed a couple of 'Ricoh Imaging Service and Repair' agents here in NZ and in Australia so I'm waiting to see if any parts are available.


Cheers.


10-28-2015, 04:32 PM   #92
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QuoteOriginally posted by dcshooter Quote
I saw a thread around here once where someone had fashioned one out of some thin wire and had success with it. If you post a pic, I might be able to tell if it's interchangeable with one from a different model (and possibly send one if it is ).

Hey, thanks for the quick reply mate. Yes, I've just read the one about the thin wire and it looks great but I'm not much of a one for fabrication I'm afraid !! Here's the offending item - obviously the 'stiff' focusing was due to the pins being bent back underneath themselves and ultimately breaking up.....




---------- Post added 10-28-15 at 04:44 PM ----------

AGH - forget it mate - I just moved the focusing assembly on my desk and the electrical contact strip fell into three pieces !! Looks like what ever was going on the focus issue maybe caused excessive movement of the tiny little ribbon cable and it has disintegrated !!! Looks like it's MF only for me with this lens :-(
11-01-2015, 08:10 PM   #93
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Hey, I've procured the schematics for the DA35mm F/2.4 here :- markoneswift's Album: DA 35mm schematics - PentaxForums.com - can these be added to the database ? Cheers

---------- Post added 11-01-15 at 08:12 PM ----------

QuoteOriginally posted by dcshooter Quote
I saw a thread around here once where someone had fashioned one out of some thin wire and had success with it. If you post a pic, I might be able to tell if it's interchangeable with one from a different model (and possibly send one if it is ).

An update, if you're interested .I've managed to find a Ricoh Imaging sales & service agent here in New Zealand ( Christchurch to be exact ) who have supplied me a schematic for the lens and it looks like the parts I need can be obtained :-)
11-01-2015, 10:13 PM   #94
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Do you have the schematic for the DA* 16-50 f/2.8 lens?

11-01-2015, 11:22 PM   #95
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QuoteOriginally posted by mee Quote
Do you have the schematic for the DA* 16-50 f/2.8 lens?

No mate, I only have the DA35 because I'm buying parts for it. I can ask the service centre though and see if they can help.
11-02-2015, 05:34 AM   #96
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Wow. Very cool that you can procure the parts from Ricoh. Here in the US they don't supply parts to the general public anymore.
11-02-2015, 12:46 PM   #97
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QuoteOriginally posted by dcshooter Quote
Wow. Very cool that you can procure the parts from Ricoh. Here in the US they don't supply parts to the general public anymore.

I'm (hopefully) getting the parts through the Ricoh / Pentax service centre that I found here in NZ, who seem to be fine with selling the parts on to me. They did offer a fitting service using their technician but since it's a relatively low-value lens I'm having a go myself.....it can't get any worse than MF and no aperture control !!!!!
11-02-2015, 02:01 PM   #98
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QuoteOriginally posted by markoneswift Quote
it can't get any worse than MF and no aperture control !!!!!
Yes, it can. A few of *my* lens "repairs" have proven that.

11-02-2015, 03:23 PM   #99
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QuoteOriginally posted by asharpe Quote
Yes, it can. A few of *my* lens "repairs" have proven that.

I suppose no aperture at all or a complete inability to reassemble the lens could be worse :-)
11-12-2015, 02:08 PM   #100
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Question :

Anyone had any experience with a late model SMC Takumar 50/1.4 ?

I just acquired one with a black Spot F, but there's a "huge" debris speck deep center in the lens.

I disassembled form the rear the last two lens elements but was stuck on how to go further ... so I put it all back together for a "punt" and re-think.

Any advice and/or input would be appreciated. Thanks in advance, J
11-13-2015, 08:18 AM   #101
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This lens tends to collect debris on the surfaces of the elements immediately adjacent the aperture blades. If this is where the debris is on yours, you can simply remove the front trim ring and entire front cell then blow it out from the front. The late SMCs are a bit trickier to remove the rear group from due to the extra metering lever.

QuoteOriginally posted by Jean Poitiers Quote
Question :

Anyone had any experience with a late model SMC Takumar 50/1.4 ?

I just acquired one with a black Spot F, but there's a "huge" debris speck deep center in the lens.

I disassembled form the rear the last two lens elements but was stuck on how to go further ... so I put it all back together for a "punt" and re-think.

Any advice and/or input would be appreciated. Thanks in advance, J
12-15-2015, 12:52 PM   #102
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I think the 'zooming contact brush' has had a redesign. I've just received a new one for my DA35 from Japan and it looks different to the old one in as much as the 'forks' are now held together by a plate, rather than being independent of each other - like this :-


12-15-2015, 05:08 PM   #103
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Actually, looks like the contact brush has the little plate on the end to ensure integrity of the forks during transit. There's no way it will fit with it attached and the plate actually broke itself off while I was doing a trial fit. The brush fits much better without the plate. I suppose, thinking about it, the plate would have caused all kind of weird readings - probably would have messed with the resistance etc. Anyway, all reassembled so looking good :-)
01-01-2016, 01:41 AM   #104
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Bonjour,

Looking for advice/input for a M 100/2.8 with light edge fungus in the very front element group.

I tore down to this front element group but got no further with ease.

Is this a screw down cap-ring here or glued ... or maybe both?

I re-assembled and will shoot with the 100 anyway, but it would be nice to clean it up a bit.

Cheers, J
04-03-2016, 09:50 PM   #105
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Hi all,
I am looking for the instruction for DFA 100 Marco WR as it seems to have sticky aperture blades. Please help.
Thanks.
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