Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
7 Likes  #1
Super-Takumar 1.4/50 dissasembly.
Posted By: thundertwin72, 12-14-2012, 10:32 PM

A few days ago, knowing I had some problems (focus and aperture), I bought it from a fellow from another forum in hopes of getting it back. Since the focusing system is similar in most lenses, comment, as a guide, now the process. I apologize for the translation: I do not speak English and I used Google Translator.

Unscrew (while pressed) the front trim ring. If you do not have a specific tool for it, a rubber drain plug can serve.

Then, removing the three smaller screws, we can remove the ring with thread holder.

To remove the focus ring, we'll remove the three screws on the back burner.

Those at first, fix the headlights and diaphragm to helicoid.

After removing the focus ring, there was a recess in it, which corresponds to the path it takes to rotate. The ends of said recess with a screw cap will be seen later that in accordance advance disassembly.

Mark with a permanent ink pen (with alcohol can then delete) the position of the rim with the inscriptions of depth of field, loosen the three set screws that are around and extract.

Now we can see the screw abuts the focusing ring recess, limiting its travel, does not require disposal.

At the height of the screw, and after the aperture ring, is the steel ball that allows the "click" to diafragmar.

Pulling slowly aperture ring, see the aforementioned ball, you have to be careful because she can jump and lost. Remove the ring.

Now we must remove the back cover, which contains mechanisms and frame stopped down. This will mark the first position, we will remove the three screws around, and she'll pull gently.

We now note inside the lid removed and we pay attention to two points:

On the right, the cam pin which connects the rear of the objective diaphragm lever and whose end is shaped fork.

And at the left, where that pivots the shaft fixed with a screw.

When we return to riding, we must take into account the points mentioned in the previous step, the cradle of the diaphragm cam and the pivot of it, must match in two recesses marked with yellow arrows. On the right, larger, corresponding to the fork. The left, smaller, the pivot. If mounted upside down, the diaphragm mechanism will not work.

Red arrows indicated with and fixed by a pair of screws, plates appreciate that guide and limit the travel of approach; mark in which each side is (are different and if installed incorrectly interfere with the movement of the aperture setting mechanism) and withdrawal.

Holding the brass ring do? where is the focusing screw, screw in the direction indicated by the arrows (contrary thread will), the black color ring until it stops (1/4 turn more or less). Caution: Do not tighten too hard or you can get stuck in a way that is very difficult to undo later.

Now, holding the black ring unscrew in the direction indicated by the arrows, the light clusters forming block, diaphragm and helical. Do it very slowly and check (very important) the exit point of the thread.

Unscrew, as indicated by arrows, brass ring and black ring (the call because I do not know how they are called).

This image shows the three parts making up the focusing mechanism. Each one is threaded into the next and is the intermediate ring with which makes rotation, when mounted, the focus is shifting.

Clean with petrol lighter all traces of grease and / or dirt and re-lubricate sparingly.

I personally use for finer threads, a grease like this: Quilube , is rather smooth. For thicker threads: a thicker grease.

Yet greased and reverse the process and remount all:

first screw until it stops brass rings and black. For the starting point, turn to screw the front block, also until it stops.

Holding back the brass ring, unscrew the black ring about 1/4 turn (remember that going from right to left) until the match accommodations abutting badges with their guides. Screw them in place.

To the rear of approach does not interfere with the movement of the aperture setting mechanism, we turn the brass ring to eject the helicoid.

Riding back cover hours considering diaphragm lever (lower), has to stay in the fork (top) of the cam pin that connects the rear. Mount and tighten.

On both sides of the objectives there guides which delimit the extent of the aperture, which are traversed by respective screws (shown only one shown).

Said screws fit into respective recesses having aperture ring so that, when rotated, moving the screws by guides.

With a little fat, place the steel ball into its housing and pushing it around with the tip of a screwdriver, set the aperture ring.

Replace and tighten the ring with the depth of field scales.

With the lens mounted on a camera and turning the brass ring, focus on a distant object to calibrate infinity.

After that and without touching anything, placing the focus ring so it stops when matching orange diamond (index distances), with the infinity position. Care that nothing moves, screw.

Place and screw the threaded ring with the filter holder and, after this, screw the trim ring.

If care has been taken back to have a lens whose focus is smooth and fluid.

In the picture: the lens at infinity position.

And now in a position minimum focus distance.

Note: The holes in the front of its previous owner.

Views: 7,978
12-15-2012, 09:21 AM   #2
Veteran Member
kcobain1992's Avatar

Join Date: Dec 2010
Location: Bucharest, Romania
Photos: Gallery
Posts: 1,409
Excellent instructional!
01-14-2013, 01:52 PM   #3
Junior Member

Join Date: Oct 2012
Posts: 28
Thanks for the very detailed and useful strip down instructions, TT72, I've just bought a second hand F.1.4, which is in the post, and no doubt when I get it and inspect it it will need a strip down and clean. Brilliant.
01-14-2013, 05:03 PM   #4
ducdao's Avatar

Join Date: Dec 2009
Location: Montreal/Vermont
Posts: 2,160
Great stuff! Thanks!

11-28-2013, 10:45 PM   #5
New Member

Join Date: Nov 2013
Posts: 3
This is so handy! So detailed too. My darling old 1.4 met with a misadventure when my sister borrowed it many years ago. The focus ring is squashed rather horribly and doesnt quite work like it should. I'm fairly handy with disassembling and repairing/upgrading my laptop so I will give this a go.
04-05-2017, 10:05 AM   #6
New Member
Adam Schwarzschild's Avatar

Join Date: Mar 2017
Posts: 2
It's ra relief to have these steps to feel more confident about disassemble this lens. Actually my aperture ring won't turn it's like something wedged it in place. So i followed these instruction and find out 2 free screws inside the barrel, i suppose it comes from the switch thing, anyway there are a pin who is bend, i don't know if it's on purpose?! What other thing could make the aperture ring stuck?

On the picture you can see this little pin just above these two holes where the switch are attached! Is someone already disassembled it and can confirm me the normal state of this pin?

Any help would be really appreciated!
Attached Images

Last edited by Adam Schwarzschild; 04-05-2017 at 10:31 AM.

  • 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!
aperture, arrows, brass, cam, diaphragm, focus, mechanism, position, screw, screws
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Super Takumar 50mm f/1.4 lens, 50/1.4, original caps, plus Pentax Skylight filter grahame Sold Items 4 12-08-2012 01:06 PM
For Sale - Sold: Super Takumar 50/1.4 SMC Pentax-M 50/1.4 ddhytz Sold Items 2 10-01-2012 03:18 AM
Super-Takumar 55/1.8 or 50/1.4? durr3 Pentax SLR Lens Discussion 8 10-02-2011 01:43 PM
For Sale - Sold: Super-Takumar 50/1.4, Super-Takumar 135/3.5, Pentax A70-210/4, yurko_yr Sold Items 6 07-13-2011 05:14 PM

All times are GMT -7. The time now is 06:06 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]