Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Canon Cameras, Lenses & Accessories Canon Lenses 
Thread started 08 Jun 2008 (Sunday) 13:23
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

Cleaning a lens - have I messed up?

 
Andy_Cam
Senior Member
Avatar
385 posts
Joined Jan 2008
Location: Netherlands
     
Jun 08, 2008 13:23 |  #1

I was out an about taking photos today and had a couple of lens swaps. When I got back, I gave my kit a check over, blowing most of the dust etc off with a rocket blower.

Now the painful part. On the rear element of my 24-105 there was a spot that would not go away, a bit like a water mark or something. I got out my brand new (unused) microfibre cloth and rubbed it fairly hard from one side to the other... only to notice a large streak across the lens. A bit more gentle rubbing with clean faces of the cloth has got rid of said mark and streak but it has resulted in what looks me rubbing off a film/ coating off the lens! This is only visible in direct sunlight though and not under a normal desktop light.

So, the questions:

1) Has anybody done this before?
2) Is there some sort of film on the rear element of a lens?
2) How do I fix it?
3) Does it matter anyway if I cannot see any trace of it on my photos?

Thanks for any input. I am hoping to hear that I am not as much of a cretin as I now feel.


Gear | flickr (external link)

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
WMS
"Escargot on the Hoof"
Avatar
2,886 posts
Joined Nov 2006
     
Jun 08, 2008 13:34 |  #2

Before deciding that I had done something wrong I would wet clean the lens element in question. I normally keep Zeiss premoistened lens cloths in my camera bag for this but any good lens cleaning liquid and lens tissue is as good (although less convenient)

Wayne


I'm just a simple maker of love charms and tokens,who occasionally takes a picture or two.
Gear list: more toys than I need, Fewer than I want.

  
  LOG IN TO REPLY
ed ­ rader
"I am not the final word"
Avatar
23,359 posts
Gallery: 4 photos
Likes: 549
Joined May 2005
Location: silicon valley
     
Jun 08, 2008 13:38 |  #3

WMS wrote in post #5684129 (external link)
Before deciding that I had done something wrong I would wet clean the lens element in question. I normally keep Zeiss premoistened lens cloths in my camera bag for this but any good lens cleaning liquid and lens tissue is as good (although less convenient)

Wayne

good suggestion. i'd think you'd have to be using some serious elbow grease to remove lens coatings with a micro fiber cloth :D.

ed rader


http://instagram.com/e​draderphotography/ (external link)
5D4, 80d, 16-35L F4 IS, 24-70L II, 70-200L F4 IS II, 100-400L II, sigma 15 FE, sigma 14 f1.8 art, tc 1.4 III, 430exII, gitzo 3542L + markins Q20, gitzo GT 1545T + markins Q3T, gitzo GM4562

  
  LOG IN TO REPLY
Andy_Cam
THREAD ­ STARTER
Senior Member
Avatar
385 posts
Joined Jan 2008
Location: Netherlands
     
Jun 09, 2008 00:26 |  #4

Thanks both. I will buy some lens cloths and give it a shot. :D


Gear | flickr (external link)

  
  LOG IN TO REPLY
muscleflex
Goldmember
3,013 posts
Likes: 3
Joined Jun 2005
Location: UK
     
Jun 09, 2008 06:20 |  #5

let us know the result


:cool:Canon 1D MK III:cool: | Canon EOS 20D | Canon 16-35 II [COLOR=red]L [COLOR=black]| Canon 100-400 [COLOR=red]L IS | [COLOR=#000000]Canon 50mm II 1.8 | Canon 580 EX II

  
  LOG IN TO REPLY
MichSt
Goldmember
Avatar
1,115 posts
Gallery: 128 photos
Likes: 352
Joined Oct 2006
Location: Lansing, MI
     
Jun 09, 2008 08:07 |  #6

WMS wrote in post #5684129 (external link)
Before deciding that I had done something wrong I would wet clean the lens element in question. I normally keep Zeiss premoistened lens cloths in my camera bag for this but any good lens cleaning liquid and lens tissue is as good (although less convenient)

Wayne

I also use this product for cleaning, and keep a few in the bag just in case. They're not cheap, but they work well.


Mario.Q

Canon EOS R

  
  LOG IN TO REPLY
Marnault
Member
112 posts
Joined Aug 2007
     
Jun 09, 2008 10:04 |  #7

Andy_Cam wrote in post #5684089 (external link)
A bit more gentle rubbing with clean faces of the cloth has got rid of said mark and streak but it has resulted in what looks me rubbing off a film/ coating off the lens! This is only visible in direct sunlight though and not under a normal desktop light.

It sounds like you removed the multi-coating on the rear element of your lens. Multi-coating is designed to prevent reflections, improve contrast, and improve light transmission. Since this is the back of the rear element the improved light transmission from the coating is very minor, but the the anti-reflective property is fairly important. Without the coating you may end up with a reflection of the sensor appearing in your images. This is probably the only thing that you will notice from the loss of the coating. You most likely wont see any signs of this is most images, but it might happen once in a while.

As for fixing it, applying multi-coating is a very precise job as the thickness of the coating needs to be nearly identical across the element. I'm sure if you sent it into canon they could fix it, but I have no idea how much it would cost, but I doubt it would be very cheep.


When cleaning lenses in the future it is best to wait until you are at home, and can work under a bright light. Unless the element is filthy theres a good chance that any dust or crud that a rocket blower wont remove wont even show up in any images. Also you should never rub with lots of pressure, if anything the amount of pressure should be as little as possible, ideally just the weight of the lens cleaning tissue, the trick is to just use more tissues. Just remember a dirty lens will generally perform better than a poorly cleaned lens.


Canon 400D & 40D - Sigma 10-20 F4-5.6 - Canon 17-55mm F2.8 IS - Canon 28-105mm F3.5-4.5 - Sigma 70-200mm F2.8 - Canon 50mm F1.8 - Canon 100mm F2.0 - Canon 400mm F5.6http://www.flickr.com/​photos/marcarnault/ (external link)

  
  LOG IN TO REPLY
Tee ­ Why
"Monkey's uncle"
Avatar
10,596 posts
Likes: 5
Joined Feb 2006
Location: Pasadena, CA
     
Jun 09, 2008 12:18 |  #8

It sounds to me like some oily residue on the rear element since you can smear it.
But before using a microfiber, I'd recommend blowing on the lens or better yet moistening a microfiber with a bit of a lens cleaning solution, use that to initially clean the lens and then drying it off with a dry part of the micro fiber.

I doubt you did any damage, but dry cleaning a lens which may potentially have something on it with a microfiber is not a good idea. Also, you generally should clean lightly with the fiber to prevent accidentally scratching the lens.

Good luck.


Gallery: http://tomyi.smugmug.c​om/ (external link)

  
  LOG IN TO REPLY
Woolburr
Rest in peace old friend.
Avatar
66,487 posts
Gallery: 115 photos
Best ofs: 2
Likes: 140
Joined Sep 2005
Location: The Tupperware capitol of eastern Oregon...Leicester, NC!
     
Jun 09, 2008 12:24 |  #9

Marnault wrote in post #5689010 (external link)
It sounds .... Without the coating you may end up with a reflection of the sensor appearing in your images. ....

You could just as well end up with a reflection of Elvis.:shock: Have you ever documented a reflection of the sensor? I would honestly like to see this one verified.


People that know me call me Dan
You'll never be a legitimate photographer until you have an award winning duck in your portfolio!
Crayons,Coloring Book, (external link) Refrigerator Art (external link) and What I Really Think About (external link)

  
  LOG IN TO REPLY
bsmotril
Goldmember
Avatar
2,536 posts
Gallery: 11 photos
Likes: 350
Joined Feb 2006
Location: Austin TX
     
Jun 09, 2008 13:20 |  #10

The reflections the coatings minimize don't make a ghost image show up on the sensor. Those reflections, just like those inside a lens, cause a general reduction in contrast and color saturation.

Never dry rub a lens with anything IMHO. At a minimum, fog it with your breath first. And only do that after a blower or brush treatment first to remove any surface debris.


Gear List
Galleries: http://www.flickr.com/​photos/smopho/ (external link) --- http://billsmotrilla.z​enfolio.com/ (external link)

  
  LOG IN TO REPLY
tryandcatchme
Mostly Lurking
16 posts
Joined Mar 2008
     
Jun 09, 2008 14:43 |  #11

MichSt wrote in post #5688460 (external link)
I also use this product for cleaning, and keep a few in the bag just in case. They're not cheap, but they work well.

I've also been using the disposeable zeiss cleaning cloths and never looked back. I've found them as cheap as $7 for a 21 pack.

The biggest problem with those micro fiber cloths is they're exposed, so any dust or crap thats on them that you dont know about can get wiped on or scratch up your element.




  
  LOG IN TO REPLY
ed ­ rader
"I am not the final word"
Avatar
23,359 posts
Gallery: 4 photos
Likes: 549
Joined May 2005
Location: silicon valley
     
Jun 09, 2008 15:20 |  #12

tryandcatchme wrote in post #5690574 (external link)
I've also been using the disposeable zeiss cleaning cloths and never looked back. I've found them as cheap as $7 for a 21 pack.

The biggest problem with those micro fiber cloths is they're exposed, so any dust or crap thats on them that you dont know about can get wiped on or scratch up your element.

i just paid $10.90 delivered for a box of 90 from evil bay :D. these look like they will work great.

ed rader


http://instagram.com/e​draderphotography/ (external link)
5D4, 80d, 16-35L F4 IS, 24-70L II, 70-200L F4 IS II, 100-400L II, sigma 15 FE, sigma 14 f1.8 art, tc 1.4 III, 430exII, gitzo 3542L + markins Q20, gitzo GT 1545T + markins Q3T, gitzo GM4562

  
  LOG IN TO REPLY
bryank930
Senior Member
814 posts
Likes: 1
Joined Oct 2007
Location: Racine, WI
     
Jun 09, 2008 15:40 |  #13

You can get the zeiss cloths from walmart for fairly cheap.


Canon EOS 60D | Google Nexus 7 | Samsung Galaxy S4 / SPH-L720 | Tamron SP AF 17-50mm f/2.8 XR Di-II LD ASP IF | Canon EF 85mm f/1.8 USM EF-S 55-250mm f/4-5.6 IS | Yongnuo YN-565 YN560

  
  LOG IN TO REPLY
MichSt
Goldmember
Avatar
1,115 posts
Gallery: 128 photos
Likes: 352
Joined Oct 2006
Location: Lansing, MI
     
Jun 09, 2008 16:07 |  #14

bryank930 wrote in post #5690898 (external link)
You can get the zeiss cloths from walmart for fairly cheap.

What department do they carry them in??


Mario.Q

Canon EOS R

  
  LOG IN TO REPLY
ben_r_
-POTN's Three legged Support-
Avatar
15,894 posts
Likes: 13
Joined Nov 2007
Location: Sacramento, CA
     
Jun 09, 2008 16:13 |  #15

Order a Lenspen while you're at it!


[Gear List | Flickr (external link) | My Reviews] /|\ Tripod Leg Protection (external link) /|\
GIVE a man a fish and he'll eat for a day. TEACH a man to fish and he'll eat for a lifetime.

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

3,250 views & 0 likes for this thread
Cleaning a lens - have I messed up?
FORUMS Canon Cameras, Lenses & Accessories Canon Lenses 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is Bruceruth1988
694 guests, 228 members online
Simultaneous users record so far is 15144, that happened on Nov 22, 2018

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.