View previous topic :: View next topic |
Author |
Message |
ilguercio
Joined: 08 Mar 2012 Posts: 414 Location: Southern Italy-Calabria!
|
Posted: Fri Mar 16, 2012 11:05 pm Post subject: S-M-C Takumar 50 1.4 mechanical problems |
|
|
ilguercio wrote:
I just received this Tak but i've noticed that the aperture won't close down past half stop before f/5.6.
Also, i can hear a subtle click when moving the focus ring from 0,7 m to 0.8 m, it sounds like the helicoid touches a diaphragm blade.
Another thing is that i dont have such a hard stop at infinity, it looks like it's different from the end at 0.45 m.
The lens must have been dropped, the filter ring is a bit damaged but the images from the Tak look absolutely perfect.
Any thoughts? |
|
Back to top |
|
|
ilguercio
Joined: 08 Mar 2012 Posts: 414 Location: Southern Italy-Calabria!
|
Posted: Fri Mar 16, 2012 11:19 pm Post subject: |
|
|
ilguercio wrote:
Ok, i guess i've already found the problem.
It's the adapter that either prevents the aperture lever to turn completely or doesn't fully press the pin if not screwed totally.
What should i do? |
|
Back to top |
|
|
ilguercio
Joined: 08 Mar 2012 Posts: 414 Location: Southern Italy-Calabria!
|
Posted: Fri Mar 16, 2012 11:27 pm Post subject: |
|
|
ilguercio wrote:
Update:i tried to move the switch to MAN and i got a preset lens but as i turn the focus ring the whole mechanism makes a weird noise, like metal surfaces gritting against each other. If i set it to AUTO the ring is smooth as silk.
Then i have this problem with the adapter, any ideas?
Even if i hold the big pin down with my thumb there is still that weird noise when focusing.
If i set F16 with the adapter i can't go past 1.5m.
Found something useful:
http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/135293-s-m-c-takumar-50mm-1-4-distance-scale-problem.html
This is for the clicky focusing.
The other problem was fixable by filing down the inner ring of my adapter. It was holding the pin down but was also pushing sideways onto the aperture lever. A good filing action (and a bit of sweat) did the trick. I have set the lens to MANUAL because i suspect that on AUTO the pin is not fully pressed thus not closing the aperture after the above mentioned stop.
Now i really need one of those tools to unscrew the lens assembly if i want to fix this minor issue. |
|
Back to top |
|
|
ilguercio
Joined: 08 Mar 2012 Posts: 414 Location: Southern Italy-Calabria!
|
Posted: Sat Mar 24, 2012 5:44 pm Post subject: |
|
|
ilguercio wrote:
I did a side to side comparison between my Tak and my Zuiko and the latter seems to let more light through at any aperture compared to the former.
Can the Tak be yellow a bit or that only affects white balance?
I can't notice any yellowing but since the lens is radioactive i guess it can yellow over time somehow.
Bu the way, still haven't found a good way to unscrew the nameplate ring, the lens needs a good lube of the focus ring but i need the right tools to do it. |
|
Back to top |
|
|
ilguercio
Joined: 08 Mar 2012 Posts: 414 Location: Southern Italy-Calabria!
|
Posted: Tue Mar 27, 2012 2:46 pm Post subject: |
|
|
ilguercio wrote:
Why can't i tighten the focus ring?
Focus was a bit loose so i removed the front part but the 3 screws are so hard to tighten.
The focus ring is slippery, i have to press it against the brass ring to focus. |
|
Back to top |
|
|
ilguercio
Joined: 08 Mar 2012 Posts: 414 Location: Southern Italy-Calabria!
|
Posted: Tue Apr 03, 2012 6:08 pm Post subject: |
|
|
ilguercio wrote:
Solved with a bit of metal epoxy, i guess i will need some sort of hammer if i ever have to disassemble it again.
The lens isn't the prettiest of them all but works, perhaps the focus ring is a bit slow albeit smooth. |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|