Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-12-2011, 09:26 AM   #1
New Member




Join Date: Feb 2011
Posts: 5
Cleaning inside of Pentax-M 135/3.5

Hi everybody!

This is my first post here - nice to see there is an active Pentax community.

I'm having trouble with a 135/3.5 lens... it seems some tiny buy (more like a flea) has climbed inside and decided to die on the inside of the front lens. Probably won't influence image quality too much, but it still bothers me.

I have some trouble disassembling the lens... I've succeeded in screwing off the front ring with the printed type numbers etc, but I have no idea on how to proceed. There are no "three screws" visible as described for other lenses etc... Anyone ever disassmbled the front part of this lens?

Thanks...

berferd.

02-12-2011, 01:35 PM   #2
Giveaway winner!
MysteryOnion's Avatar

Join Date: Dec 2007
Location: beantown
Photos: Albums
Posts: 933
I have yet to land a M135/3.5 for myself, but I would wonder if you see any of the following.
A. Two spanner rings. As one is around the front and the other is nested behind.
B. Flat face or no seam that holds the front.
C. Single heavy slotted spanner ring.

Lacking a shroud that comes off with the three screws, the entire front group is part of the front shroud. This means that it will twist off from the helicoid and lower portion. The hint is usually condition B.
02-12-2011, 01:59 PM   #3
New Member




Join Date: Feb 2011
Posts: 5
Original Poster
I've attached a picture of the front part, front ring (with the lens data printed into it) removed. Seems like type B.

Do you have any information on how I can twist this off? I have read elsewhere that (for another lens, Takumar 135) the right way to do is to set focus to "close", extend the hood, grab the lens between hood and focus ring and screw if off counter clock wise. This does not seem to work here, though. Any ideas?

Thanks, berferd
Attached Images
 
02-12-2011, 04:31 PM   #4
Veteran Member




Join Date: Dec 2009
Location: Ontario
Posts: 550
Disassembling the lens can be very very tricky. I have one right now apart that I have not been able to put back together yet as the barrel is screw design and it right now is not focusing properly. So keep that in mind if you are taking it apart try to record all you steps and the key location points. As you may end up with focusing issues if the register distance is changed.

02-12-2011, 04:40 PM   #5
Veteran Member
Gashog's Avatar

Join Date: Apr 2010
Location: NY
Photos: Albums
Posts: 523
This looks like a non AI nikkor 50mm. When unscrewing the ring that holds the front group in, try a pair of dish washing gloves. They give you superman grip and multiply your twisting force like 1000 times!

I see that little bug.
02-12-2011, 09:55 PM   #6
Pentaxian
Just1MoreDave's Avatar

Join Date: Feb 2007
Location: Aurora, CO
Photos: Gallery | Albums
Posts: 4,859
QuoteOriginally posted by berferd Quote
I've attached a picture of the front part, front ring (with the lens data printed into it) removed. Seems like type B.

Do you have any information on how I can twist this off? I have read elsewhere that (for another lens, Takumar 135) the right way to do is to set focus to "close", extend the hood, grab the lens between hood and focus ring and screw if off counter clock wise. This does not seem to work here, though. Any ideas?

Thanks, berferd
It's a sneaky design, probably to work in the sliding hood. You have to loosen and slide off the rubber grip on the focus ring. Slide a pocket knife in there and run it around once to break the old glue. Get it about halfway up and you'll see six holes. Slide the hood forward and focus to infinity, and three screws will line up with three holes.

I'm not sure what the next step is - never had to do that. The front of the lens comes off somehow after you remove the three screws.

If you have trouble, the bug is probably not within the APS-C frame anyway.
02-13-2011, 04:46 AM   #7
New Member




Join Date: Feb 2011
Posts: 5
Original Poster
ugh... this sounds troublesome...
unfortunately I'm not using APS-C but good old-fashioned 35mm analog.. not sure as how bad this bug will affect image quality... probably not worth the hassle?
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!
front, k-mount, lens, pentax lens, slr lens, trouble
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cleaning the dust inside the lens rustynail925 Pentax SLR Lens Discussion 10 01-10-2010 08:37 PM
Cleaning out the focusing screen and the inside. LeDave Troubleshooting and Beginner Help 12 09-14-2009 06:55 AM
Cleaning an old lens inside simons-photography Pentax SLR Lens Discussion 2 01-07-2009 03:12 PM
Pentax M 50/1.7...Something Seems to Shake Inside--Please Help zx-m Pentax SLR Lens Discussion 9 05-14-2008 11:34 AM



All times are GMT -7. The time now is 08:25 AM. | 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