Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
09-23-2009, 08:57 PM   #1
Site Supporter
ismaelg's Avatar

Join Date: Apr 2009
Location: Puerto Rico
Photos: Gallery
Posts: 962
Freebee lens fixed!


Years ago, a distant relative gave me this lens that happened to be Pentax K-mount. I remember using it once in my K1000. Recently, I re-discovered it. It was dirty, missing some screws and had fungus inside. Didn't look very good at all. So I decided to try and "fix" it. I've done that with other cheap lenses before and been a freebee, I was not risking much.
Found some spare minutes today under a massive thunderstorm and took apart the lens. I was able to disassemble it completely including all 3 glass elements, without molesting the delicate aperture mechanism. The elements had fungus, dust, dirt etc. Cleaned it up, put it back together and tested it. The aperture was not working so took it apart again, this time more carefully took apart some of the aperture mechanism, noticing how it works and figuring how it should work. At the end, the aperture ring is a bit flimsy but it works! I tried it several times on an empty film body before attempting the DSLR. I finally did and here you can see some rather boring quick indoors test results. I guess that outdoors in sunny bright light, it should work fine. So now I have a 135mm (202 eq in DSLR) free lens. Not that it will be used a lot but cool nonetheless.

Here is how it looks now. Unfortunately I didn't take any pics while disassembled. I was too concentrated on it trying not to mess it up.

Quick tests:

100% crop, untouched

Not too bad for a freebee!
If anything, I got from this exercise more than a free cheap lens. I got knowledge and experience!
I'm building up courage to attemp the same to my Pentax A50 f2


09-23-2009, 09:26 PM   #2
Senior Member
Hawki's Avatar

Join Date: Oct 2006
Location: North Face of Mount Shasta
Photos: Albums
Posts: 107
Very cool Ismael ... have fun with it.
09-24-2009, 05:20 AM   #3
Veteran Member
Matthew's Avatar

Join Date: Feb 2008
Location: Hawkesbury
Photos: Gallery
Posts: 378
How about adding it to the lens database...

QuoteOriginally posted by ismaelg Quote
including all 3 glass elements,
Three elements is a little unusual and I have never heard of the brand. The multi-coating looks very neutral in colour.
It would be great to add this one to the lens database once you have given it a bit more of a trial.
09-24-2009, 05:36 AM   #4
Veteran Member
pcarfan's Avatar

Join Date: Sep 2007
Location: Dayton, Ohio
Photos: Gallery | Albums
Posts: 2,960
Cool,..... also I have the exact same model flat top stove at home

09-24-2009, 06:14 AM   #5
bdery's Avatar

Join Date: Mar 2008
Location: Quebec city, Canada
Photos: Gallery
Posts: 5,831
Three elements is a little unusual and I have never heard of the brand.
It's more likely three GROUPS, each made of more than one element. I doubt three elements would make a good or even decent 135 mm lens.

Fine work, it's sad that you didn't have the time to document it while working. If I ever take a lens apart, I'll make sure to do so, for posterity and such

Good work.
09-24-2009, 06:40 AM   #6
Site Supporter
ismaelg's Avatar

Join Date: Apr 2009
Location: Puerto Rico
Photos: Gallery
Posts: 962
Original Poster
Hello again,

Thanks for the comments. It only has 3 elements. 3 pieces of glass, that's all. One small behind the aperture blades (this had the most fungus), the front element and the third grouped with the front one. When I get a chance I'll take it apart again to document it and see if I can improve the aperture ring.
Good idea to include it in the database. I'll do more tests on it.

09-26-2009, 07:20 AM   #7
Senior Member

Join Date: Nov 2007
Location: Kitchener/Waterloo, Ontario, Canada
Photos: Gallery | Albums
Posts: 221
nice repair job - looks like you have a sharp lens on your hands for 0$ now i want one

  • 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!
aperture, dslr, elements, freebee, fungus, k-mount, lens, mechanism, pentax, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fixed aperture manual lens help Joe Troubleshooting and Beginner Help 7 09-01-2010 10:38 PM
Freebee HP Cartridges, 45 (B), 78 (C) Phil1 Digital Processing, Software, and Printing 2 12-25-2009 08:59 AM
Fast fixed or zoom lens for sports? Davidparis Pentax SLR Lens Discussion 14 11-13-2009 08:29 AM
Where is pentax 135 mm fixed lens? ogl Pentax SLR Lens Discussion 54 05-24-2008 10:26 PM
1 everyday fixed lens: advice requested arthur pappas Pentax DSLR Discussion 23 01-24-2008 05:12 PM

All times are GMT -7. The time now is 02:23 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]