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04-07-2020, 06:25 AM   #1
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Pentax 43mm: AF function broken, looking for a repairing service in Berlin

Hi there,

My lens dropped down on the floor by my mistake. Now the AF function doesn't work. I disassemble the lens and just found that one of the AF's gear was not tied correctly: Something was broken.

Is that possible to replace the gear? And is there any service in Berlin that helps?

Thanks a lot for your reading.

Best

04-07-2020, 06:39 AM - 1 Like   #2
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See listing for Germany.

Pentax Repair Facilities (Wordwide listing) - PentaxForums.com
04-07-2020, 08:47 AM   #3
icy
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QuoteOriginally posted by jlstrawman Quote
Thanks lot. There is one service in Germany but not in Berlin unfortunately. I will send them an email anway.
04-08-2020, 02:29 AM   #4
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I think Maerz used to have a facility in Berlin, but not anymore. They can fix it in Hamburg.

04-08-2020, 11:20 PM   #5
icy
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Thanks @zapp. You're right. I contacted them, and they told me to send the lens to Hamburg, they would get back to me with the quote and the plan. I will try it out.
06-26-2020, 03:01 AM - 1 Like   #6
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I fixed that myself. I can use the lens as a MF lens now, as you can see from the image , I removed the AF gear and its shaft. The gear was a bit broken.

The AF function of a 43mm is not so awesome to me anyway

---------- Post added 06-26-20 at 05:06 PM ----------

Fyi, I used a PH00 screwdriver
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07-12-2020, 08:46 PM   #7
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QuoteOriginally posted by icy Quote
I fixed that myself. I can use the lens as a MF lens now, as you can see from the image , I removed the AF gear and its shaft. The gear was a bit broken.

The AF function of a 43mm is not so awesome to me anyway

---------- Post added 06-26-20 at 05:06 PM ----------

Fyi, I used a PH00 screwdriver
Wow brave! Do you have more photos of the process and was resetting the infinity focus easy? I think mine hits the stop just a fraction before infinity.
07-29-2020, 10:15 AM - 1 Like   #8
icy
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QuoteOriginally posted by FotoPete Quote
Wow brave! Do you have more photos of the process and was resetting the infinity focus easy? I think mine hits the stop just a fraction before infinity.
Hi FotoPete, I'm sorry for my late response. I just didn't check my email box often.


Let me share my story first.


I used to disassemble a few lenses (Some M42 / Manual Pentax lenses). And also Pentax zoom lens 18-55mm which was already a bit broken before I played with it. Yeah it's few years ago already. I even learnt how to short lens contacts, to trick the body to see some M42 lens as an A lens (Kr: short contacts to change aperture when using M42 lens ? - Page 2 - PentaxForums.com)


That meant, I actually practiced quite a lot before going with my Pentax 43 mm. I intended to send the lens to some repairing service, however it's not such one in Berlin, and sending the lens a few hundreds miles to another city, is quite risky. So I decided to convert the lens to a MF lens -- the AF feature for my 43mm wasn't so awesome, so why not just remove it?

The good news that I know is the design of Pentax lens is quite simple. It's even simpler than some MF lenses that I've known. So I was very confident. In my first attempt, I failed to remove the rear part (with a few contacts used by AF system): The cause was that I didn't have the right/strong screwdriver. Then I spent quite a lot of time waiting and searching for the one: I finally found one from OBI baumarkt in Berlin ( OBI Baumarkt & Online-Shop - alles fr Heim, Haus, Garten und Bau ). I didn't try to buy one from online shop: it's easy to get a wrong one again

Then, on my second attempt, everything was perfect. You know what, the most challenging thing is to remove the name ring (the front ring, with all text about your lens). Sometimes you have to use a very special tool: But I was lucky with my hands. Once again, Pentax lens is very awesome because it's very easy to play with it.

In my case, I had to disassemble the lens from both sides: front part, and rear part. I then removed the AF gear and shaft. Then I assembled them. Well, once again, this was also very challenging because I didn't know anything about this 43mm lens structure before. On my 3rd attempt, I could make correct tuning for the focus ring. Except for the AF function, the lens now works identically as before.

Now, back to your issue, and your question. First question first: Are you pretty sure that's a mechanical issue? I meant, do you really think that just small tuning for the ring will help?

If yes, then welcome. You can fix that. And you only need to play with the front part of the lens. The rear part has a lot of tiny stuff and if you are not carefully enough you can easily break and/or lost them on the floor / carpet. ^^

How? Quite easy (but, here my instructions without any warranty: it really depends on your tools and some skills )

0. Requisite: Buy/Get the right/strong screwdriver


1. Open the name ring, which you can already try to do it now. If you can't open the name ring with your hand, you can try it another time. It's that pressing the ring with two fingers a bit strong, and then rotate the ring (counter)clockwise (hey, you would need to rotate in both redirections a bit, so it can be loosen easily.) Please don't rush, try that today. Try again another day, until you can open that.


1b. If you can't do that with your hands/fingers, please stop and buy some special tools, and/or look for some instructions already on the internet. There are a few tricks to do that. Please keep in mind that the name ring is very beautiful: Don't use any mechanical tool against it please :P

2. Open the front parts -- well, I don't have any pictures now, as I didn't think that's useful for anyone. Looked like I was wrong:P


3. Fix the focus ring. Quite easy I would show you then.


Well, I have a few days off this week, and I will disassemble the lens probably on this Saturday, take some pictures, and send to you.


So, stay tuned.

PS: I have a plan to fix my lens AF gear/shaft. However I really need some very strong glue that can deal with cooper gear. Do you know one?


Last edited by icy; 07-29-2020 at 10:50 AM.
07-29-2020, 10:41 AM   #9
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Thanks for the details Icy!

I think its just a small re-alignment of the outer focus ring and the collar behind it that attaches the helicoid to the focus ring. I can see in live view that I hit the hard stop just before the focus reaches infinity. The building across the street is sharp but the buildings in the distance aren't as sharp.

I'll have to try wiggling the name ring with a rubber stopper again, it seems pretty tight. Does the name ring unscrew like most takumar and Pentax manual focus lenses? I've opened up 50mm takumars and SMC K/M lenses before so I have an idea where the issue might be but looking at your photos and the money spent on the lens, I want to be sure haha! Nothing else sees out of place on my lens.

Last edited by FotoPete; 07-29-2020 at 10:49 AM.
07-29-2020, 11:04 AM   #10
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QuoteOriginally posted by FotoPete Quote
Thanks for the details Icy!
np. I should have taken a lot of picutes during my fix


QuoteQuote:

I think its just a small re-alignment of the outer focus ring and the collar behind it that attaches the helicoid to the focus ring. I can see in live view that I hit the hard stop just before the focus reaches infinity. The building across the street is sharp but the buildings in the distance aren't as sharp.
If you are lucky the problem maybe that the screws were loosen, and that makes the core component (with glasses) rotated, and that forced the focus ring to stop. That's quite tricky to understand, but that's actually a problem you need to solve when assembling the lens =))


QuoteQuote:

I'll have to try wiggling the name ring with a rubber stopper again, it seems pretty tight. Does the name ring unscrew like most takumar and Pentax manual focus lenses?
Yes. I can rotate it with my two thumbs/fingers. If you have a rubber stopper, that definitely helps.


QuoteQuote:
I've opened up 50mm takumars and SMC K/M lenses before so I have an idea where the issue might be but looking at your photos and the money spent on the lens, I want to be sure haha! Nothing else sees out of place on my lens.
Woh, awesome. It's great that you've tried to fix some lenses before. I'm pretty sure that this Pentax 43mm is a lot a lot easier, though it's more complex (esp the rear parts with electric contacts). In the past, I had a chance to fix a manual CZ lens for my friend: It's manual, old lens. But it's very complex/hard and I totally broke it lolz


You can fix your problem I think :P
07-29-2020, 06:29 PM   #11
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QuoteOriginally posted by icy Quote
If you are lucky the problem maybe that the screws were loosen, and that makes the core component (with glasses) rotated, and that forced the focus ring to stop. That's quite tricky to understand, but that's actually a problem you need to solve when assembling the lens =))
I hope the problem is accessible once I get the name ring off and not have to remove any more parts, : I've ruined a few lenses myself before
08-02-2020, 10:15 AM - 2 Likes   #12
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The upload function of the forum is broken from my side. I have tried to upload several times, and the I almost reached the quota limit.

So I have all pictures here https://postimg.cc/gallery/LLrTGqW.

The images, in order:

00. The original lens
01. Now with the hood and lens filter removed. You see the name ring on the top
02. Now the lens with its name ring removed
03. Same as 02 picture, from another view. You see there are 3 screws which is used to fix
a protector ring. This ring is seen on the pictures 06 and 08.

I created the marker atop, very next to the screw. Which isn't really necessary though.
You will see the marker in the 05 picture. (The marker must be removed when you finish)



05, 06, 07, 08.


Now how it's after the protector ring unscrew/removed. At this step, it's very safe. You can even
attach the lens to your camera body, and give some tests :P That's because core component (glasses)
are actually fixed by 3 other crews (you see that these screws attach the aluminum ring (it's not a ring
actually; it's just a ring on the picture). Let's name them internal body screws (sorry, I don't know the name)


Now, to fix you problem, rotate the focus ring until you reach the infinity mark
(seen on the 07 picture). Then loosen the internal body screws a little bit, and shift the core component
a little bit, and then unloosen the screws. (or not, it's up to you). At the same time, attach the lens
to the body, and take any picture for testing.

Repeat the step until you think the issue is fixed. unloosen the internal body screws, and enjoy.




















---------- Post added 08-03-20 at 12:48 AM ----------

PS: If you are not sure, remember to create some marks (as I created on the picture 05), however, for the internal body screws. If these screws are loosen and the core component is rotated too much / a bit far from its original position, it's nightmare, as it's very very hard to correct them: The core component must be aligned well at two positions (infinity and nearest position) of the focus ring.

Last edited by icy; 08-02-2020 at 10:54 AM.
11-03-2020, 03:04 PM   #13
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Sorry for the late update. I was able to adjust it and had to break the locktite. It appears re-tightening the screws can shift the core helicoid enough to throw the focus which was probably what happened at factory. I will have to verify infinity focus on a current-gen pentax dSLR when I have the chance but it looks good on my Sony with Rayqual adapter now.
3 Days Ago   #14
icy
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QuoteOriginally posted by FotoPete Quote
Sorry for the late update. I was able to adjust it and had to break the locktite. It appears re-tightening the screws can shift the core helicoid enough to throw the focus which was probably what happened at factory. I will have to verify infinity focus on a current-gen pentax dSLR when I have the chance but it looks good on my Sony with Rayqual adapter now.
no worries. It' great that you could try to fix that issue. Such small issue doesn't really need some expensive service
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