Canon Digital Photography Forums  

Go Back   Canon Digital Photography Forums > 'Equipment Talk' section > Canon EF and EF-S Lenses
Register Rules FAQ Members List Search Today's Posts Mark Forums Read



Reply
 
Thread Tools Display Modes
Old 24th of March 2011 (Thu)   #1
fotoworx
"I get 'em pregnant"
 
fotoworx's Avatar
 
Join Date: Mar 2009
Posts: 4,547
Default How to clean the Back element of a Lens?

How do I go about cleaning the back element of a lens?

I don't want to mar the black non reflective coating.
__________________
.
Jim
.
f o t o w o r x
fotoworx is offline   Reply With Quote
This ad block will go away when you log in as member
Old 24th of March 2011 (Thu)   #2
John_B
Cream of the Crop
 
John_B's Avatar
 
Join Date: Sep 2006
Location: Hawaii
Posts: 6,731
Default Re: How to clean the Back element of a Lens?

For me, unless I got my finger print on the glass I would just use a rocket blower.
John_B is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #3
bsmotril
Goldmember
 
bsmotril's Avatar
 
Join Date: Feb 2006
Location: Austin TX
Posts: 2,332
Default Re: How to clean the Back element of a Lens?

Rocket blower for dust. IF smudged, after blowing, then fog with breath and use a micro fiber lens cloth.
bsmotril is offline   Reply With Quote
This ad block will go away when you log in as member
Old 24th of March 2011 (Thu)   #4
mr. bates
Member
 
mr. bates's Avatar
 
Join Date: Mar 2011
Location: Leeds
Posts: 41
Default Re: How to clean the Back element of a Lens?

If its a weathersealed lens use rocketblower otherwise I dont because Ill just be forcibg the dust to go inside the lens. For smudges then I breath on it then use pecpads, for dust, I tend to use arctic butterfly, yes the one for sensor.
mr. bates is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #5
fotoworx
"I get 'em pregnant"
 
fotoworx's Avatar
 
Join Date: Mar 2009
Posts: 4,547
Default Re: How to clean the Back element of a Lens?

Am I being to anal?

Can you ever look through a lens aimed at say a desklamp and expect to see NO dust whatsoever?
__________________
.
Jim
.
f o t o w o r x
fotoworx is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #6
MGW172
Member
 
Join Date: Nov 2006
Location: Tennessee
Posts: 503
Default Re: How to clean the Back element of a Lens?

Sounds like dust on the rear element? Either way, I'd use a rocket blower first, then a lenspen for both dust and fingerprints if necessary.
__________________
7D | 20D | Canon 10-22 | Canon 15-85 | Canon 70-300 L | Canon 100-400 L
MGW172 is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #7
Bokehlicious
Member
 
Bokehlicious's Avatar
 
Join Date: Jan 2011
Posts: 809
Default Re: How to clean the Back element of a Lens?

Rocket blower, lenspen and blower again.
Bokehlicious is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #8
SkipD
Cream of the Crop
 
SkipD's Avatar
 
Join Date: Dec 2002
Location: Southeastern WI, USA
Posts: 19,721
Default Re: How to clean the Back element of a Lens?

This works for the glass on either end of a camera lens:



A squeeze-bulb blower such as a Rocket Blower by Giottos, quality lens tissue (such as that sold by Kodak and now Tiffen), a good lens cleaning fluid, and PROPER TECHNIQUE is the way that I have cleaned my lenses for decades.

What is "proper technique"?

First - the goal is to clean the lens (or filter - I would use the very same process) without grinding any dirt/debris into the lens. To me, this absolutely dictates single-use surfaces for anything that touches the lens. That's why I use lens tissues instead of a washable cloth or - particularly - something like a lens pen.

Here are the steps that I use to clean a lens:

1. Use a squeeze-bulb blower to blow any loose dust off the lens. 90% of the time, step 1 is all that is necessary.

2. Take a lens tissue out of the pack. Fold it once, holding only what was the ends of the tissue. You want to be extremely careful to NEVER TOUCH the areas of the lens tissue that will be touching the lens. This will avoid transferring oils from your fingers to the lens.

3. Moisten the folded portion of the lens tissue with a little lens cleaner. You don't want the tissue dripping wet, but it must be damp.

CAUTION: NEVER apply lens cleaner directly to the lens (though it won’t hurt a filter, you don’t want liquid leaking into the lens’ innards).

4. Wipe LIGHTLY across the lens ONCE with the damp tissue. Then either turn it over or fold it so that you can wipe again, but with an unused surface. You can do this as often as needed, as long as you never wipe the lens twice with any surface of the tissue. This prevents scratches. Again, make sure you never touch an area of the tissue that will touch the lens.

5. Ensuring that the lens is actually clean, use a dry tissue, handled the same way as above, to wipe the lens dry. Since you have already removed the dirt, there's no risk of scratching the lens with the dry tissue.

6. Dispose of the used lens tissues in a proper trash receptacle.

That's it in a nutshell. Simple and effective. I've been cleaning my lenses this way for over 40 years, and all of them have pristine glass (and none have ever worn "protective" filters).
__________________
Skip Douglas
A few cameras and almost 50 years behind them .....
..... but still learning all the time.
SkipD is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #9
MGW172
Member
 
Join Date: Nov 2006
Location: Tennessee
Posts: 503
Default Re: How to clean the Back element of a Lens?

I respect your advice Skip and with your method, I'm sure you have never damaged a lens surface.

But I'm not sure about the value of insisting on a single surface use of a cleaning device in most cases. What I don't understand is that if there is something on the lens that the blower didn't get, then what prevents it from creating the scratch during that first wipe? The dirt on the lens is there even though the tissue is pristine, no matter how many tissues you use. I agree you shouldn't try to grind any particles into your optics, but it seems to me it's more important to use light pressure more than one swipe and no more with a individual tissue.

I've used a rocket blower then a lenspen, microfiber cloths and cleaning fluid in that order as needed, and never seen any damage to my optical surfaces, both camera lenses/filters and telescopes/eyepieces.

Have I just been lucky and do I need to change my methods? Skip, I'd like to hear your thoughts.
__________________
7D | 20D | Canon 10-22 | Canon 15-85 | Canon 70-300 L | Canon 100-400 L

Last edited by MGW172 : 24th of March 2011 (Thu) at 19:33.
MGW172 is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #10
mr. bates
Member
 
mr. bates's Avatar
 
Join Date: Mar 2011
Location: Leeds
Posts: 41
Default Re: How to clean the Back element of a Lens?

^ this is why I use arctic butterfly
mr. bates is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #11
MGW172
Member
 
Join Date: Nov 2006
Location: Tennessee
Posts: 503
Default Re: How to clean the Back element of a Lens?

Quote:
Originally Posted by mr. bates View Post
^ this is why I use arctic butterfly
For cleaning lenses?
__________________
7D | 20D | Canon 10-22 | Canon 15-85 | Canon 70-300 L | Canon 100-400 L
MGW172 is offline   Reply With Quote
Old 24th of March 2011 (Thu)   #12
SkipD
Cream of the Crop
 
SkipD's Avatar
 
Join Date: Dec 2002
Location: Southeastern WI, USA
Posts: 19,721
Default Re: How to clean the Back element of a Lens?

Quote:
Originally Posted by MGW172 View Post
What I don't understand is that if there is something on the lens that the blower didn't get, then what prevents it from creating the scratch during that first wipe? The dirt on the lens is there even though the tissue is pristine, no matter how many tissues you use.
The first wipe is with a WETTED tissue (using lens cleaner) and almost no pressure. That takes all the particulates off the lens without risk of scratching the surface.
__________________
Skip Douglas
A few cameras and almost 50 years behind them .....
..... but still learning all the time.
SkipD is offline   Reply With Quote
Old 25th of March 2011 (Fri)   #13
MGW172
Member
 
Join Date: Nov 2006
Location: Tennessee
Posts: 503
Default Re: How to clean the Back element of a Lens?

Quote:
Originally Posted by SkipD View Post
The first wipe is with a WETTED tissue (using lens cleaner) and almost no pressure. That takes all the particulates off the lens without risk of scratching the surface.
Okay, gotcha. Thanks!
__________________
7D | 20D | Canon 10-22 | Canon 15-85 | Canon 70-300 L | Canon 100-400 L
MGW172 is offline   Reply With Quote
Old 25th of March 2011 (Fri)   #14
JustinJi
Member
 
Join Date: Oct 2010
Posts: 50
Default Re: How to clean the Back element of a Lens?

The hell is a rocket blower? Compressed air??
JustinJi is offline   Reply With Quote
Old 25th of March 2011 (Fri)   #15
MGW172
Member
 
Join Date: Nov 2006
Location: Tennessee
Posts: 503
Default Re: How to clean the Back element of a Lens?

Quote:
Originally Posted by JustinJi View Post
The hell is a rocket blower? Compressed air??
No need to swear! Just kidding......no compressed air (dont ever use that on precision optics), a rocket blower is a special bulb type blower Here: http://www.giottos.com/Rocket-air.htm

Works great for blowing dust off and away.
__________________
7D | 20D | Canon 10-22 | Canon 15-85 | Canon 70-300 L | Canon 100-400 L
MGW172 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
What do you use to clean the rear element? slr_noob Canon EF and EF-S Lenses 16 26th of January 2010 (Tue) 13:00
How's to clean the glass on back of lens? tonyhoang Canon EF and EF-S Lenses 6 14th of January 2010 (Thu) 13:27
The things that cover the back element of Lens when not on camera??? DallasPhoto Accessories & Storage 17 10th of January 2009 (Sat) 09:38
how do I clean the back of my lens? greatshot Canon EF and EF-S Lenses 6 18th of September 2008 (Thu) 18:00
How to take apart your 70-200 lens to clean under the front element. Nightscape Canon EF and EF-S Lenses 73 14th of August 2008 (Thu) 12:41


All times are GMT -5. The time now is 23:14.


Powered by vBulletin® Version 3.6.12
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
This forum is not affiliated with Canon in any way and is run as a free user helpsite by Pekka Saarinen, Helsinki Finland. You will need to register in order to be able to post messages. Cookies are required for registering and posting. HTML in messages is not allowed, plain website addresses are automatically made active by the board.