Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-07-2019, 12:19 PM - 1 Like   #1
New Member




Join Date: Nov 2019
Posts: 5
Takumar 200mm F3.5 repair

Hello !

So, i recently acquired a takumar 200mm F3.5 preset lens on ebay.

It was quiet cheap and sold "as is". BUT, i can't get infinity focus and the photos looks very soft wide open.
I guess the lens has been reassembled wrong. Problem is, i can't find anywhere how to disassmble this lens.

I don't think the only 2 screws i found will help me much for the moment(on the photo).
There's also a place for a lens spanner in the rear of the lens close to the 2 screws -as you can see on the photo- i tried to unscrew it without success, but i went quiet softly as i am afraid of damaging it.
I'm also able to take out the front and rear optical element but can't go any further.

So, may anybody help me ?

Thank you all very much!

Attached Images
View Picture EXIF
Redmi Note 7  Photo 
View Picture EXIF
Redmi Note 7  Photo 
11-09-2019, 04:10 AM   #2
Site Supporter
Site Supporter
Nick Rowland's Avatar

Join Date: Oct 2019
Location: Eastbourne, Sussex, UK
Posts: 36
This is a little vague but might help Tele-Takumar 200/5.6 Preset Disassembly

Nick
11-15-2019, 04:39 AM   #3
Site Supporter
Site Supporter




Join Date: Mar 2014
Photos: Gallery
Posts: 1,272
See if there is any adjustment left in your helical, otherwise you need to rebuild it
11-26-2019, 02:48 AM - 2 Likes   #4
New Member




Join Date: Nov 2019
Posts: 5
Original Poster
Hi, problem solved !

You just need a lens spanner to unscrew a ring at the back of the lens, the one you can see on the second picture above ( not the retainer ring of the rear optical element). The lens will come apart as 2 pieces.

One piece with all the optical element and aperture control.
The other one is the focusing system.

With a small screwdriver and a lens spanner you'll ne able to adjust it correctly. Unfortunatly i forgot to take picture of it, sorry !

Thank you and have a nice day

12-02-2019, 01:50 PM   #5
Pentaxian




Join Date: Dec 2009
Location: Dallas / Yucatan
Posts: 1,147
QuoteOriginally posted by yocry Quote
Hi, problem solved !

You just need a lens spanner to unscrew a ring at the back of the lens, the one you can see on the second picture above ( not the retainer ring of the rear optical element). The lens will come apart as 2 pieces.

One piece with all the optical element and aperture control.
The other one is the focusing system.

With a small screwdriver and a lens spanner you'll ne able to adjust it correctly. Unfortunatly i forgot to take picture of it, sorry !

Thank you and have a nice day
Thank you for sharing the solution. From time to time, I'm tempted to take another lens apart (only a couple so far) and it is helpful to know how others solved the puzzle.

Do you have any photos of the pieces after they were disassembled? How is the focusing system adjusted once out?

Thank you again!
12-04-2019, 11:32 PM - 2 Likes   #6
New Member




Join Date: Nov 2019
Posts: 5
Original Poster
Hi, i just disassembled the lens once again just for you guys.

So first you need to unscrew the retainer ring at the back of the lens, like i said above. You'll get this :



From left to right : optical block and aperture control, retainer ring, focusing block.

Now, unscrew the 4little screw here (2 on each side) :



Take off the 2 little piece.

What you mat do now is putting the optical block back in the focusing block, put the lens on your camera, and try to get infinity focus, then take thé lens off and fond a way to know thé distance between each blocks, like so :



Now : you'll need a lens spanner to remove this :



Screw it back from another thread, screw on one of the small pièces previously removed, put the lens to infinity focus and checké if distance is correct. If not, repeat last step, if it is, you may re-assemble everything.
12-05-2019, 05:24 PM   #7
Pentaxian




Join Date: Dec 2009
Location: Dallas / Yucatan
Posts: 1,147
Wow, that's great! I think there's a Maintenance & Repair Forum that might be a good place for a write-up like this one. But even writing it up here with the photos is a super service to everyone else who may have to work on these older prime lenses.
05-11-2020, 05:25 AM   #8
New Member




Join Date: May 2020
Posts: 4
Hello everyone!
I am new here but I have use the forum for sometime now for usefull information about lenses.
I own a Takumar 200mm F3.5, and I have tried to open it for cleaning the lens inside but I have some problems doing that. I cannot unscrew the retainer ring on the back. I have a lens spanner but it did not help me much. Can you help with an advice for what to use? The retainer ring does not have a place for the lens spanner.

05-11-2020, 09:10 PM   #9
Pentaxian




Join Date: Dec 2009
Location: Dallas / Yucatan
Posts: 1,147
QuoteOriginally posted by bonico Quote
Hello everyone!
I am new here but I have use the forum for sometime now for usefull information about lenses.
I own a Takumar 200mm F3.5, and I have tried to open it for cleaning the lens inside but I have some problems doing that. I cannot unscrew the retainer ring on the back. I have a lens spanner but it did not help me much. Can you help with an advice for what to use? The retainer ring does not have a place for the lens spanner.
Hello Bonico,

Welcome to PentaxForums! Hope you find the place useful.

I don't have that particular lens so I cannot look at it to see what you are referring to. If the following links don't help, maybe making your own post with a photo of your lens would help draw attention to where the problem is or the ring without slots? People may not find your comment within this (older) post.


This is a similar lens, but maybe not assembled the same, I dunno: 200mm F4 Takumar Dissambly Guide - PentaxForums.com

This is a guide to the various lens repair / assembly guides that may help if there is one for a similar situation as you have:

Pentax Lens Disassembly Database - Page 12 - PentaxForums.com
05-13-2020, 02:22 AM   #10
New Member




Join Date: May 2020
Posts: 4
Thanks a lot for your info and reply!
05-22-2020, 06:24 AM   #11
Senior Member




Join Date: Feb 2012
Photos: Gallery
Posts: 136
My copy also wouldn't focus to infinity. But the problem was that the 3 lenses in the front element weren't tightened properly. Front element is easily unscrewed and than that whole piece is able to be unscrewed yet again. I don't have a spanner but I managed to tighten the lens rings with measuring calipers. Not only did it start to focus to infinity but the lens is now tack sharp. It was very smudgy and soft earlier.
05-23-2020, 10:39 PM   #12
New Member




Join Date: May 2020
Posts: 4
My copy has good focus but is dirty inside and I do not know how remove the inner elements to clean them. Any ideas?!
05-24-2020, 11:41 AM - 2 Likes   #13
Senior Member




Join Date: Feb 2012
Photos: Gallery
Posts: 136
QuoteOriginally posted by bonico Quote
My copy has good focus but is dirty inside and I do not know how remove the inner elements to clean them. Any ideas?!
Here are the pictures. It's very easy.


As I said. the front 3 lenses are housed in one single housing that is easily unscrewed by hand.


1. Hold the lens firmly with your left hand at the bottom (near the mount) and with your right hand start unscrewing the front part of the lens which has a red dot for aperture indication. It's a fine thread and it takes a while to unscrew it.
2. After you unscrew the whole front 3 lens assembly, unscrew it even further and you'll get the rear part of the assembly which you can clean easily.
3. Front part consists of two lenses, one front one which is held by the front ring with name and serial number and inner lens which is held by its own retaining ring.


You have to remove either one of those to get access to both lens for cleaning, or just remove everything if you want to clean it carefully.
I used calipers for the rings because I don't have a spanner.

The fourth lens is the lens near the mount. I couldn't get to that lens because I have a same problem as you do. I was unable to unscrew the rear retaining ring. But if you open the aperture, you could in theory take a long Q tip and clean that rear lens with alcohol.







Unscrew the front assembly



Front assembly which consists of 3 lens


Unscrew it even further and you'll get one part with only one lens on the left and part with two lens on the right


The middle lens is held by its own retaining ring. If you remove that lens you'll get access to front lens as well.


Rear lens is theoretically accessible for cleaning from the inside just make sure not to close aperture accidentally, keep it wide open.





Sorry for bad photos I'm on my way out. But I think you'll manage it's not complicated.


P.S.

Those 3 lens in front assembly were not tightened down properly with their retaining rings in my case which caused inability to focus to infinity and very soft images. Who knows, maybe over time they got loose or something.
05-24-2020, 11:15 PM - 1 Like   #14
New Member




Join Date: May 2020
Posts: 4
Wow, this is great! Is exactely what I need to do the job right. Thanks a lot! You are a life savier.
Best regards,
Bogdan

---------- Post added 05-24-20 at 11:23 PM ----------

Oh, by the way, your lens it looks great compare to mine whitch it has a gray finish looks.
Thanks again!
05-25-2020, 03:15 AM   #15
Senior Member




Join Date: Feb 2012
Photos: Gallery
Posts: 136
QuoteOriginally posted by bonico Quote
Oh, by the way, your lens it looks great compare to mine whitch it has a gray finish looks.Thanks again!
tnx. I just bought it on ebay last week from a guy in Germany. I was looking on takumarguide website and it seems that mine is in a middle of production (paralell DOF guide). Only thing I think is weird is the serial number. Mine is 1195660 and the author of the site stated that this batch is ending at 1195630. I would really like to know a little bit of history of my particular copy.

1 : 3.5 f=200 (338) - Takumar Field Guide
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
200mm, f3.5, lens, pentax service, photo, repair, screws, service, takumar, takumar 200mm f3.5, thanks, warranty
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
SMC Takumar f3.5 135mm or the SMC Pentax f3.5 135mm - Which to keep? Martinhind Pentax SLR Lens Discussion 8 04-04-2019 08:37 AM
To repair or not to repair??? david94903 Troubleshooting and Beginner Help 10 02-18-2018 09:18 PM
Sankyo kohki super komura unidapter 200mm f3.5 repair help needed Charlie Victor Repairs and Warranty Service 10 04-06-2017 08:08 AM
Super Takumar 200mm f4 repair question akfreak Pentax SLR Lens Discussion 5 07-08-2010 09:32 AM



All times are GMT -7. The time now is 04:25 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top