Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-24-2008, 06:05 AM   #1
Junior Member




Join Date: Oct 2007
Location: Netherlands
Posts: 35
Cleaning haze on old lenses

Dear all,
I just bought a Pentax SMC-M 100mm f/4 macro lens from someone. There was some haze on the front element of the lens so I disassembled it to take closer look. I stripped the glass from its metal casing. The front element looks like it has two layers of glass glued together and the haze looks to be in between the two layers of glass. This could be attributable to the cementing compounds used to glue the two layers together. Is there a way to clean/dissolve this residue? Does heating the lens help? I'm appealing to all experts on cleaning glass....
best regards

03-25-2008, 09:40 PM   #2
Veteran Member
frank's Avatar

Join Date: Nov 2006
Location: Singapore
Photos: Gallery
Posts: 3,202
QuoteOriginally posted by Mojo_fish Quote
Dear all,
I just bought a Pentax SMC-M 100mm f/4 macro lens from someone. There was some haze on the front element of the lens so I disassembled it to take closer look. I stripped the glass from its metal casing. The front element looks like it has two layers of glass glued together and the haze looks to be in between the two layers of glass. This could be attributable to the cementing compounds used to glue the two layers together. Is there a way to clean/dissolve this residue? Does heating the lens help? I'm appealing to all experts on cleaning glass....
best regards
By my limited knowledge, haze is pretty easy to clean, but fog isn't. Your case sounds like foggy to me. If it's between two elements, don't think it'd be easy to fixed unless you change the elements together.

BTW, here is the optical formular of the M100/4 macro lens:


It's 5 elements in 3 groups structure. The front two elements are cemented together.
03-26-2008, 12:16 AM   #3
Site Supporter




Join Date: Mar 2007
Location: Honolulu, Hawaii
Photos: Gallery
Posts: 92
I had a 100mm f/4 macro lens with the same problem. I disassembled and heated the element but it did not work.
03-26-2008, 02:17 AM   #4
Site Supporter




Join Date: Nov 2006
Posts: 193
QuoteOriginally posted by Mojo_fish Quote
Dear all,
I just bought a Pentax SMC-M 100mm f/4 macro lens from someone. There was some haze on the front element of the lens so I disassembled it to take closer look. I stripped the glass from its metal casing. The front element looks like it has two layers of glass glued together and the haze looks to be in between the two layers of glass. This could be attributable to the cementing compounds used to glue the two layers together. Is there a way to clean/dissolve this residue? Does heating the lens help? I'm appealing to all experts on cleaning glass....
best regards
I think your best bet is to find another lens with some other defect but with a clear front element and do a swap. Depending on the cement used, it might be possible to soak the two-layer element in a solvent to separate them and then re-cement them with special UV-cure cement, but that's a long shot at best.

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!
element, front, glass, haze, k-mount, layers, lens, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cleaning old lenses 8540tomg Pentax SLR Lens Discussion 3 08-16-2010 07:18 AM
Cleaning Lenses bigK Pentax SLR Lens Discussion 7 07-30-2010 11:04 PM
Cleaning Lenses and Mount noVICE Troubleshooting and Beginner Help 3 06-01-2010 08:51 PM
For Sale - Sold: FS: Many Lenses: House Cleaning! Buddha Jones Sold Items 7 11-20-2007 02:52 PM



All times are GMT -7. The time now is 04:50 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