Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-05-2012, 07:40 AM   #1
New Member




Join Date: May 2012
Posts: 2
50mm 1.7 rear element yellowish haze

Got a Pentax M 50mm 1.7 from local flea market. Clean all the fungus on the front & rear element by following helpful instruction on this forum. Really helpful and thanks.

Anyone can help to get rid of these yellowish haze at the rear element, its in between 2 glass and I think it glued together?

Attached Images
View Picture EXIF
Canon EOS 600D  Photo 
View Picture EXIF
Canon EOS 600D  Photo 
05-05-2012, 08:43 AM   #2
Senior Member




Join Date: Jun 2010
Location: Saarbrucken
Photos: Gallery
Posts: 241
Hi,
if this is an element of two lenses from the rear as it shown on a sheme on a link - than the haze is a lens separation. In such case, unfortunetely, there is nothing that could be done. I had similar issue with SMC 55/1.8 - it is a group of two lenses glued together.
http://kmp.bdimitrov.de/lenses/primes/_optics/50f1.7.gif
This haze most probably would not affect hte image quality.
Sorry for the bad news.
Yuriy
05-05-2012, 09:00 AM   #3
Inactive Account




Join Date: Feb 2010
Photos: Gallery | Albums
Posts: 12
I have seen three examples of the 1.7 and all of these had blurred rear elements attributed to lens separation. it seems that this is an inherent weakness of the 1.7 lens. two of these lenses were given to me but were useless.
05-05-2012, 05:05 PM   #4
Veteran Member
kcobain1992's Avatar

Join Date: Dec 2010
Location: Bucharest, Romania
Photos: Gallery
Posts: 1,409
May I ask what did you use to clean the fungus, and if the haze is not actually on the lens surface?

05-05-2012, 06:10 PM   #5
Site Supporter
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 27,682
QuoteOriginally posted by yurko_yr Quote
In such case, unfortunetely, there is nothing that could be done.
If, indeed, there is separation, the group elements can be re-cemented by a good tech, though it is probably not worth the trouble or expense. To be honest, I must echo kcobain1992...what did you use to remove the fungus. If the infestation was bad enough to etch the coatings (usually the case) removing the fungus will likely result in damage to the coatings or even the glass itself. I have seen two lenses in the last month where this was the case.

As for the M 50/1.7 being prone to rear element separation...that is a new one for me. I have been active here for several years and have never heard of such a thing. Fungus growing in the balsam cement, yes...separation, no.

BTW...to the OP...Welcome to the Pentax Forums!


Steve

(...has one way to deal with fungus...immediate removal to sealed plastic bag...thorough hand washing and cleaning of work area...deposit in trash or send back to seller...)

Last edited by stevebrot; 05-05-2012 at 06:20 PM.
05-05-2012, 07:45 PM   #6
New Member




Join Date: May 2012
Posts: 2
Original Poster
I use moniter cleaner which did quite a good job to the rest of the lens. The haze is in between the 2 glass lens so probably its the cement getting hazy. may b will try to seperate n re cement myself?

Yup best way to deal w fungus......back to seller. Unfortunately cant return.

Thanks for the warm wecome!
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!
50mm, element, haze, pentax help
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
8 element vs 7 element 50mm f1.4 RMJ Troubleshooting and Beginner Help 8 09-19-2011 12:11 PM
Will Pentax M50/2 rear element group fit M50/1.7? altopiet Troubleshooting and Beginner Help 8 08-20-2011 09:22 AM
50MM Rear Element Seperation Sloglass Troubleshooting and Beginner Help 3 05-31-2011 02:52 AM
Push-on/slide-on rear element lens caps Edgar_in_Indy Pentax Camera and Field Accessories 12 04-16-2011 09:20 AM
Damaged rear lens element on F70-210, can the element be replaced? WendyB Pentax SLR Lens Discussion 13 01-05-2008 08:41 AM



All times are GMT -7. The time now is 10:46 PM. | 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