Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
  #1
Lens Scatches repaires to abrasive # 6 micron and/or finer.
Posted By: gmans, 07-11-2018, 11:54 AM

Have # 6 micron and was clean up old glass and then repair hope contrast to the glass.

Anyhow quick little repair or leave it to paper weight. Thanks. Cheers
Views: 567
07-11-2018, 03:18 PM - 1 Like   #2
PJ1
Site Supporter
Site Supporter
PJ1's Avatar

Join Date: Jul 2012
Location: Mosquito Creek, Australia
Photos: Gallery | Albums
Posts: 2,230
I am not sure what you want to do but if the lens coating is damaged it cannot be repaired. I believe a polishing abrasive would remove the coating and that would reduce the contrast of the lens.
07-11-2018, 03:23 PM - 1 Like   #3
Pentaxian




Join Date: Jan 2011
Location: New York
Posts: 4,147
How bad are the scratches?

If they are so bad to hurt image quality, I think the amount of glass you'll need to grind off will have other negative effects on the image quality, such as removing coatings and leaving microstratches over a larger area.

I've read about a trick using a black marker to darken scratches. A black scratch won't flare as much as an untreated scratch. Be careful about permanently staining too much of the lens, though. Trace over a scratch, then immediately wipe off the ink using a lens cloth lightly moistened with an appropriate cleaner (alcohol, lens cleaning, even water might work if you work quickly) so that only ink inside the scratch is left. Test the ink and cleaner on some junk glass first. I TAKE NO RESPONSIBILITY IF THIS RUINS YOUR LENS.
07-11-2018, 11:53 PM - 1 Like   #4
Senior Moderator
Loyal Site Supporter
Loyal Site Supporter
BigMackCam's Avatar

Join Date: Mar 2010
Location: Durham, England
Posts: 10,466
QuoteOriginally posted by gmans Quote
Have # 6 micron and was clean up old glass and then repair hope contrast to the glass.

Anyhow quick little repair or leave it to paper weight. Thanks. Cheers
At the very least, you'll remove the coatings which is going to make the contrast worse still. At worst, you'll change the shape of the element and reduce the optical performance, and/or leave even more micro-abrasions that will make the contrast worse.

If you're not already shooting with a suitable hood on the lens, I'd recommend you do so. That will limit the amount of light coming from outside the lens' field of view.

As @DeadJohn mentions, if you have one or two deeper scratches (on the front element) you can fill these in using black marker or, probably better still, flat black paint (water based acrylic is a good choice). This won't show up on your images.

If all else fails, keep the lens for spares. I've repaired several lenses with parts from my spares box

07-12-2018, 12:47 AM   #5
Site Supporter
Site Supporter
gmans's Avatar

Join Date: Dec 2012
Location: Hunter Valley,NSW, Australia
Photos: Gallery | Albums
Posts: 2,462
Original Poster
QuoteOriginally posted by PJ1 Quote
I am not sure what you want to do but if the lens coating is damaged it cannot be repaired. I believe a polishing abrasive would remove the coating and that would reduce the contrast of the lens.
The best will try a old filter. Thank you and all.

---------- Post added 07-12-18 at 05:51 PM ----------

QuoteOriginally posted by DeadJohn Quote
How bad are the scratches?

If they are so bad to hurt image quality, I think the amount of glass you'll need to grind off will have other negative effects on the image quality, such as removing coatings and leaving microstratches over a larger area.

I've read about a trick using a black marker to darken scratches. A black scratch won't flare as much as an untreated scratch. Be careful about permanently staining too much of the lens, though. Trace over a scratch, then immediately wipe off the ink using a lens cloth lightly moistened with an appropriate cleaner (alcohol, lens cleaning, even water might work if you work quickly) so that only ink inside the scratch is left. Test the ink and cleaner on some junk glass first. I TAKE NO RESPONSIBILITY IF THIS RUINS YOUR LENS.
The response definitly myself. Like black out the idea. Thanks Cheers

---------- Post added 07-12-18 at 05:57 PM ----------

QuoteOriginally posted by BigMackCam Quote
At the very least, you'll remove the coatings which is going to make the contrast worse still. At worst, you'll change the shape of the element and reduce the optical performance, and/or leave even more micro-abrasions that will make the contrast worse.

If you're not already shooting with a suitable hood on the lens, I'd recommend you do so. That will limit the amount of light coming from outside the lens' field of view.

As @DeadJohn mentions, if you have one or two deeper scratches (on the front element) you can fill these in using black marker or, probably better still, flat black paint (water based acrylic is a good choice). This won't show up on your images.

If all else fails, keep the lens for spares. I've repaired several lenses with parts from my spares box
Will be doing as your idea and keeping the bits. Thank you and best. Cheers
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!
cheers, contrast, diy, do it yourself, element, glass, idea, image, ink, lens, lens scatches repaires, micron and/or, quality, repair, scratch, scratches, spares, water, yourself
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Landscape A Finer Summers Day Kerrowdown Post Your Photos! 40 08-14-2018 10:05 PM
Micron to Discontinue Lexar Memory Cards Biro General Photography 1 06-28-2017 06:38 AM
K1 finer details not listed 2351HD Pentax Full Frame 3 02-21-2016 10:35 AM
For Sale - Sold: Pentax lens and teleconverter, Tokina lens and Panasonic cameras coolgobi Sold Items 11 10-24-2014 02:11 PM
Best starting lens? Cheap body and nice lens? or nice body and okay lens? lovemehate Troubleshooting and Beginner Help 52 10-12-2010 07:27 PM



All times are GMT -7. The time now is 05:15 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