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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 13 Jun 2014 (Friday) 21:20
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Cleaning smudges on a lens

 
Henik
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Jun 13, 2014 21:20 |  #1

I was at a dog off-leash are trying out a new canon 100-400 lens. I stopped to talk to someone and had my lens pointing downward and before I realized what happened, a dog had stuck his nose into the lens hood, smearing the lens element with his nose. I used ziess lens wipes to clean the element, but still see slight streaks. Can anyone recommend a way to get a lens spotless, as in factory clean. Generally I use B W filters on my lenses but was testing lens without filter.




  
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dpds68
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Jun 13, 2014 22:02 |  #2

A Lens Pen may be helpful .


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RayinAlaska
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Jun 14, 2014 02:18 |  #3

a. With a lens brush, even the one on a lens pen, brush the glass to remove any dust
b. On a clean microfiber lens cloth, put a couple of droplets of liquid lens cleaner, and wipe the glass with the wet spot on the cloth on a circular motion
c. Now use a dry spot on the cloth to wipe the lens in a circular motion to remove any traces of the lens cleaning solution

Liquid lens cleaner can be found at most photo shops.




  
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xhack
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Jun 14, 2014 03:36 |  #4

Decades ago, a lens-freak friend gave me a cleaning tutorial in which he insisted that the final dry after isopropyl cleaning should be radial, ie from the centre to the edges.

I've unthinkingly adhered to this technique; only now am I wondering whether he was blowing air through a sphincter. Is there a sensible rationale for this, or should I just revert to a more intuitive circular motion. Thoughts?


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pwm2
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Jun 14, 2014 03:52 |  #5

xhack wrote in post #16970814 (external link)
Decades ago, a lens-freak friend gave me a cleaning tutorial in which he insisted that the final dry after isopropyl cleaning should be radial, ie from the centre to the edges.

I've unthinkingly adhered to this technique; only now am I wondering whether he was blowing air through a sphincter. Is there a sensible rationale for this, or should I just revert to a more intuitive circular motion. Thoughts?

Don't just overthink it. Prio 1 is to remove dust before starting to wipe so you don't grind the front element. As soon as you have taken away the dust, you have lots of options.


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MalVeauX
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Jun 14, 2014 04:11 |  #6

Heya,

I don't clean my lenses very often. I don't see the point. I think cleaning them, if done improperly is more dangerous, any kind of physical rubbing can damage the coatings, or scratch things up. Cleaning them properly is just a pain to me. I only do it if it's really, really necessary. I walk through swamps and in the humid nastiness that is Florida. I touch my lenses all the time. Stuff hits my elements all the time. I don't use clear/UV filters, they're useless to me. Just lens hoods. Plenty of protection. Anyhow, the reality is, you can have all kinds of stuff in and on your lens. It takes a ton of blockage for it to actually stop enough light to matter. It takes serious smudges, smears and all kinds of debris or cracks to really effect the image seriously. I don't have time to worry about stuff on my lenses when I'm out shooting.

Anyhow, I may sound a little extreme about it, but here's an example of how indelicate it is. Lenses are plenty strong, plenty durable and I wouldn't worry about it so much to the point of spending all your time cleaning your lenses only to breath near them and put your own droplets right back on the front element.

I just took a fungus filled super takumar 50mm F1.4 (m42 mount) lens, put my finger prints all over it and then shook some sand off my arm (I was crawling in the dirt a little bit ago, doing some ground macro work on some spiders heh), then attached to my camera and shot through it. What do I notice happens with all that nastiness? The contrast goes down heavily due to the fungus and lack of coatings of a modern lens, but the finger prints and dirt really don't do much. But hey, you be the judge:

Fungus:

IMAGE: https://farm3.staticflickr.com/2900/14231557877_ecccf0a754_z.jpg
IMAGE LINK: https://flic.kr/p/nFAs​kx  (external link) IMG_5474 (external link) by Mwise1023 (external link), on Flickr

Finger prints & sand:

IMAGE: https://farm4.staticflickr.com/3879/14231557047_49ffbc72ed_z.jpg
IMAGE LINK: https://flic.kr/p/nFAs​6e  (external link) IMG_5475 (external link) by Mwise1023 (external link), on Flickr

Shot through all that to produce this:

IMAGE: https://farm4.staticflickr.com/3917/14231556397_595b579282_z.jpg
IMAGE LINK: https://flic.kr/p/nFAr​U2  (external link) IMG_5483 (external link) by Mwise1023 (external link), on Flickr

Very best,

My Flickr (external link) :: My Astrobin (external link)

  
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Nick3434
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Jun 14, 2014 13:18 |  #7

really? So no one else rolls with their T shirt??? T shirt when using and a microfiber cloth in the bag seems to work fine. I will let you guys know when I rub off all the special coatings and the lens no longer works.


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2ndviolinman
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Jun 14, 2014 13:52 |  #8

MalVeaux, that's the look I'm after in my work, for sure, so I'll treat my lenses just like that from now on.

Actually, it isn't, so I try to keep them from getting dirty. Dirt scratches, smudges kill contrast and promote flare, I don't like that look, so if one is dirty, I'll clean it. RayinAlaska's advice is good, I use good quality lens tissue, no heavy pressure. If there is grease that does not lift easily with lens cleaner, I'll go to another solvent, like isopropyl alcohol.

If that doesn't get it, and I get flack every time I mention it, but in days gone by, ether was a popular choice for grease based smudges. You don't want that stuff around, so if I recommend xylene for the occasional greasy smudge that just smears with lens cleaner, please don't flame me. It will get it factory clean after you have done the milder cleaning. Use it in a ventilated area. It is not good to breath, but no worse than pumping your own gasoline. Use no more than necessary to get the smear off, keep it off paint and plastic. I have never damaged a lens doing this, and it is better than excess rubbing when a smudge will not lift with a milder solvent.


David
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Cleaning smudges on a lens
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