Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-31-2008, 09:13 PM   #1
Veteran Member
user440's Avatar

Join Date: Jan 2007
Location: St. Louis, MO
Photos: Gallery
Posts: 350
Diagnose Lens Problem (pictures)

I have a Focal 2.8 135mm lens that I picked up on eBay some time ago, that clearly has a problem.

The front lens element appears seems to be lose in it's housing. It appears to shift within it's own vertical axis, but does not shift for or aft. Does that make sense?

I really needed a cheap 2.8 lens in this length, I would be willing to rip it apart and fix it if that is possible.

Pictures below












Thoughts?

01-31-2008, 09:32 PM   #2
Veteran Member
Gooshin's Avatar

Join Date: Sep 2007
Location: Toronto, the one in Canada.
Posts: 5,611
focusing mechanism is miss aligned, or something in the focusing mechanism is FUBAR

if this is a manual lens, go ahead and take it apart, i cant explain here whats inside, but its pretty straight forward, if nothing is bent or broken off you should be able to put it back together.

if this is an A lens with autofocus mechanisms things can get dicy
01-31-2008, 09:39 PM   #3
Veteran Member
user440's Avatar

Join Date: Jan 2007
Location: St. Louis, MO
Photos: Gallery
Posts: 350
Original Poster
It is indeed manual focus.
01-31-2008, 09:42 PM   #4
Veteran Member
Gooshin's Avatar

Join Date: Sep 2007
Location: Toronto, the one in Canada.
Posts: 5,611
QuoteOriginally posted by user440 Quote
It is indeed manual focus.
if its anything like my Chinon 50mm, its a very simple design of twin screw tubes.

think of a nut and a bolt

think of the nut as the outside of the lens, and the bolt a tube with all the lens elements in it.

they need to be properly aligned


start by taking off the rear cap and just dig in, once you get to a special set of little clips or bolts or clips that are bolted down, you should be able to completly twist the inside cylinder out of the casing

then its just a matter of twisting it back in, and securing it in the proper alignment with those same clips that were originaly preventing it from screwing out

that is.. if they are not broken.

02-01-2008, 06:02 AM   #5
Veteran Member
user440's Avatar

Join Date: Jan 2007
Location: St. Louis, MO
Photos: Gallery
Posts: 350
Original Poster
Excellent input - thank you.

Every time I see these pictures, it makes me think that that I was drinking while focusing or something...

I'll rip into it this weekend, hopefully it is just a matter of tightening everything up.

Thanks again -
02-01-2008, 11:29 PM   #6
Pentaxian
ryan s's Avatar

Join Date: Jan 2008
Location: Madison, WI
Photos: Gallery
Posts: 2,370
The first and last are actually pretty sweet...have a pinhole quality to them.
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!
k-mount, lens, pentax lens, shift, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Problem with K10 - Green pictures arratetxu Troubleshooting and Beginner Help 10 05-05-2010 03:18 AM
HELP: *ist DL Died, please diagnose? AMBIVALENCE Pentax DSLR Discussion 18 10-27-2009 09:18 PM
Help me diagnose a lens problem germar Pentax SLR Lens Discussion 10 05-21-2008 12:16 AM
Problem - My pictures have lines Dani22 Pentax DSLR Discussion 21 01-19-2008 02:49 PM
problem posting pictures chals Post Your Photos! 1 12-12-2007 11:07 PM



All times are GMT -7. The time now is 10:56 AM. | See also: NikonForums.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