View previous topic :: View next topic |
Author |
Message |
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Sun Nov 30, 2008 9:40 pm Post subject: Problem to disassemble Carl Zeiss Jena Tessar 2.8/50 |
|
|
Spag wrote:
Hey guys,
I bought today a Carl Zeiss Jena Tessar 2.8/50 for 8€. Problem: the focus ring only goes from 0.35m to 0.7m, and I can't focus between 0.7 and infinity. The focus ring is smooth, it just gets stuck at 0.7.
So I'm trying to disassemble it to see if I can fix the focus ring.
I've found a veeery nice guide to disassemble the lens:
http://oomz.net/tessar/
But I can't remove the focus ring (step 4). I guess I should unscrew it past infinity, but as it gets stuck at 0.7, can't do it.
Here's a shot from the lens, with focus ring stuck at 0.7 and infinity on the left.
Anyone got an idea what I could do to fix this nice lens?
Thanks! _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
|
Posted: Sun Nov 30, 2008 10:09 pm Post subject: |
|
|
peterqd wrote:
Without seeing the lens it's difficult to know exactly the problem, but it sounds as though someone has tried dismantling it before and not reassembled it correctly.
Does the front bezel round the glass turn when you rotate the focus dial? _________________ Peter - Moderator |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Sun Nov 30, 2008 10:20 pm Post subject: |
|
|
Spag wrote:
I guess you're right. I just figured how to remove the focus ring, and you can screw it back many ways, I guess I just have to find the right position to screw it back so I can focus both ends. Right now I can focus from 0.35 to 1, so there's already some improvement. _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
|
Posted: Sun Nov 30, 2008 10:39 pm Post subject: |
|
|
peterqd wrote:
Spag wrote: |
I guess you're right. I just figured how to remove the focus ring, and you can screw it back many ways, I guess I just have to find the right position to screw it back so I can focus both ends. Right now I can focus from 0.35 to 1, so there's already some improvement. |
You didn't answer the question! I was going to say you might need to remove and refix the part numbered 8 on buze's guide and to carefully mark the point where the helix thread becomes separated! Good luck fitting it back, you'll need some patience! _________________ Peter - Moderator |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Sun Nov 30, 2008 11:20 pm Post subject: |
|
|
Spag wrote:
peterqd wrote: |
You didn't answer the question! I was going to say you might need to remove and refix the part numbered 8 on buze's guide and to carefully mark the point where the helix thread becomes separated! Good luck fitting it back, you'll need some patience! |
Oh sorry! If by "front bezel" you mean the one with the CZJ model letters, then no, it doesn't rotate.
My hands are starting to hurt after 1.5 hours of screwing / unscrewing.. _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Mon Dec 01, 2008 1:23 am Post subject: |
|
|
Spag wrote:
Okay I don't get it.
How can the focus ring do a 5/6 of a complete rotation of the lens, when I cannot screw the lens part in the focusing ring more than 4/6 of one full rotation?
(hope it makes sense, my english sucks)
Going to bed before I break the lens _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
the_Suede
Joined: 30 Oct 2008 Posts: 67 Location: Sweden
|
Posted: Mon Dec 01, 2008 3:13 am Post subject: |
|
|
the_Suede wrote:
Try removing nr.8 and THEN turn the lens unit into the barrel as far as it will go - this should be significantly more than 4/6 of a turn. When you hit mechanical stop of the thread or some thing else, back off until nr.8 fits onto the nr.23, which I guess is the guide "male" for nr.8 which should fit OVER the nr.23. You might be on the wrong thread now, I have no idea how far the front should protrude when set at correct infinity.
After remounting the nr8 so that it fits over the nr 23 you should be able to rotate the focusing barrel (ring) correctly.
If you cant get to infinity on the camera after reassembling the lens you have to do it all over again, but this time, MARK the pieces (outer barrel and the front of the lens) together at the angle where the lens innards come loose from the barrel. If you go past infinity then you have to find the next thread where the lens barrel fits the lens assembly clockwise. If you can't reach infinty, you have to find the next thread where the lens assembly fits counter-clockwise. Then try again.
Sorry, but if you don't know the original length of the lens from flange to front when focused at infinity or closest focus, then there's no easier way to do this than by redoing it until you get it right... But if you mark the position you know don't work, then it will be easier. Good luck! _________________ You REALLY should have taken the blue pill... |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Mon Dec 01, 2008 9:20 am Post subject: |
|
|
Spag wrote:
Thank you Suede, but it looks like I hit thread stop at 4/6 of a turn... Tried to force past it but it just won't go further. And the thread doesn't look damaged in any way, so I really don't understand why am I unable to screw it past 4/6.
If I could find another model to compare with... _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
|
Posted: Mon Dec 01, 2008 12:30 pm Post subject: |
|
|
peterqd wrote:
If it helps, on my lens the helix turns one full rotation plus 1 hour, starting from the beginning of the thread. The screw 23 should be at the position of part 8 when the thread bites _________________ Peter - Moderator |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Mon Dec 01, 2008 11:32 pm Post subject: |
|
|
Spag wrote:
Could an owner of this model post one/both of the following picture:
- from the side of the lens with focus set on infinity, so I could see how "deep" should I be able to screw the lens
- from the side of the lens with focus set on 0.35, so I could see how "far" comes the lens out of the focus ring
If I screw the lens starting from position where screw 23 is in position where 8 should be until thread stop, then turn focus ring to infinity before putting 8 back in place (matching perfectly with screw 23 position), I can only focus back to 0.4, after that the lens pops out of the focus ring.
Here's the lens screwed to the max (as if focused to infinity):
And here's the lens just before it pops of the screw (focused on 0.4):
_________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Tue Dec 02, 2008 1:10 pm Post subject: |
|
|
Spag wrote:
Hmm well as seen on this other picture from a funtioning model, I guess something is wrong with the screwing thread on my lens..
But I can't find what's blocking the screwing thread. I'll try to bring it to my camera shop, see what they think. _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Wed Dec 03, 2008 1:13 pm Post subject: |
|
|
Spag wrote:
Okay so I've found the problem...
There was a tiny screw stuck inside the focus ring, I had noticed it since the beginning, but it was stuck in a position I thought it was "there for a reason", so in a last try I thought "okay let's see what happens if I get rid of it". So now the lens is repaired! ^^
Another question though: There is dust inside the back lens, so I'd like to remove #19 and #20. Do I need a special tool to unscrew #19?
Yes, I do suck at mechanics! _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
themoleman342
Joined: 21 Oct 2007 Posts: 2190 Location: East Coast (CT), U.S.A.
Expire: 2013-01-24
|
Posted: Wed Dec 03, 2008 1:40 pm Post subject: |
|
|
themoleman342 wrote:
You could get the right tool which is a lens spanner. They tend to be rather expensive for what they are. There have been some rather inventive methods to make one yourself in this forum. Just give it a search and you'll find them. I will warn you: cleaning the element is easy work but getting it back into place clean is somewhat more tricky. Especially for the smaller elements in the tessar. Unless it is an unnatural amount of dust I say skip it. |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Wed Dec 03, 2008 10:14 pm Post subject: |
|
|
Spag wrote:
Okay thanks! Well the dust isn't that bad, and it looked pretty easy to remove the back lens... but I guess I'll pass for this time.
Next lens to clean: Pentacon 2.8/135 I bought for 5€. But the dust inside deserves to be removed this time. _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
|
Posted: Wed Dec 03, 2008 10:36 pm Post subject: |
|
|
peterqd wrote:
Spag wrote: |
Next lens to clean: Pentacon 2.8/135 I bought for 5€. But the dust inside deserves to be removed this time. |
You'll need this then
http://www.mqcvisions.net/Pentacon_135_2_8/Pentacon_1.html _________________ Peter - Moderator |
|
Back to top |
|
|
Spag
Joined: 28 Oct 2008 Posts: 17 Location: Berlin
|
Posted: Thu Dec 04, 2008 5:53 pm Post subject: |
|
|
Spag wrote:
Thanks! And I need a real set of precision screwdrivers too! _________________ Pentax K100D Super, Pentax K1000
Asahi Pentax: Super-Takumar 4/150 Carl Zeiss Jena: Flektogon 2.4/35, Tessar 2.8/50 Pentacon: 2.8/135 Pentax: smc FA 35mm F2 AL, smc FA 50mm F1.4, smc M 1.7/50, smc DA 55-300 mm F4-5.8 ED Sigma: 10-20mm F4-5.6 EX DC, 17-70mm F2.8-4.5 DC MACRO, 70-300mm f/4-5.6 APO Tamron: SP 70-210mm F/3.5 Model 19AH, SP 90mm F/2.5 Macro Model 52B, SP 2X Tele-Converter Model 01F Vivitar: Series 1 70-210 Kiron, Series 1 70-210 Tokina Zenitar: 2.8/16
flickr |
|
Back to top |
|
|
knox_br
Joined: 03 Jan 2013 Posts: 2 Location: Brasil
|
Posted: Thu Jan 03, 2013 11:41 pm Post subject: up |
|
|
knox_br wrote:
Sadly I need help to service this lens. =(
I just cant unscrew the 12 element from 11.
I´m using a lot of torque with my hands, but is just rock solid.
Any ideas? |
|
Back to top |
|
|
|