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Thread: Cleaning A Lens of Fog

  1. #1
    Unwitting Thread Killer Ari's Avatar
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    Cleaning A Lens of Fog

    I have a cheap 100mm lens here I'd like to do some macro with, but the inside of the rear element is well-fogged.
    I can disassemble the lens and clean the foggy side of the lens, but I'm wondering how to properly deal with fog.
    I've read that straight vinegar is the cleaner to use, after which, leaving the lens in a box with desiccant will take care of the problem.
    I was going to use distilled water and a scanner wipe, but if there's a better way that you've tried, I'm all ears.

    Any thoughts?
    Thx in advance

  2. #2

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    Re: Cleaning A Lens of Fog

    I'd proceed by trying more mild solutions first. Clean the element as you would a regular lens surface (i.e., lens cleaning fluid or alcohol and a micro-fiber cloth). Only if that doesn't work would I try more active solutions. A standard cleaning will likely solve your problem.

    FWIW, I don't think vinegar (or any kind of acid!) is a good choice for lens cleaning. Others will chime in with suggestions for cleaning solutions, I'm sure.

    Best,

    Doremus

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    Unwitting Thread Killer Ari's Avatar
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    Re: Cleaning A Lens of Fog

    Thanks, Doremus.
    I use distilled water on my scanner glass, I figured I'd start with that.
    If it doesn't work well enough, I just found a bottle of Kodak lens cleaner fluid ca.1990. and will try that.

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    Peter De Smidt's Avatar
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    Re: Cleaning A Lens of Fog

    This is my favorite lens clenaer: https://www.edmundoptics.com/f/puros...cleaner/12946/
    I prefer it to ROR.
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing you don't already know

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    Unwitting Thread Killer Ari's Avatar
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    Re: Cleaning A Lens of Fog

    Thanks, Peter.

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    Drew Wiley
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    Re: Cleaning A Lens of Fog

    Do you mean fog between the elements from moisture condensation, like temperature shock, or having the lens too long around dampness? If that is the case, you need a little dessication chamber. Get something like a tight-lid Tupperware container, put in some freshly baked-out silica gel, put the lens in there for a couple weeks, with the lid sealed even more with perimeter tape. Cleaning disassembled elements is a slightly different topic, but already answered.

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    Re: Cleaning A Lens of Fog

    This is a very "last resort", but using a kit that clears "fog" on headlight covers does in fact work. Again this is a really "last resort" fix to be tried in my opinion. Used it on a junk lens, and it did work, but never got the courage to try it on a slightly fogged brass lens that I once had and used.

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    Unwitting Thread Killer Ari's Avatar
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    Re: Cleaning A Lens of Fog

    Quote Originally Posted by Drew Wiley View Post
    Do you mean fog between the elements from moisture condensation, like temperature shock, or having the lens too long around dampness? If that is the case, you need a little dessication chamber. Get something like a tight-lid Tupperware container, put in some freshly baked-out silica gel, put the lens in there for a couple weeks, with the lid sealed even more with perimeter tape. Cleaning disassembled elements is a slightly different topic, but already answered.
    Drew, it's the latter; the fog has been there since I bought the lens, but I've not bothered to remove the element until now.
    If a simple cleaning (distilled water, lens cleaner, lens wipe) doesn't have any effect, then I'll do as you suggest.
    Thanks

  9. #9
    Unwitting Thread Killer Ari's Avatar
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    Re: Cleaning A Lens of Fog

    Quote Originally Posted by Greg View Post
    This is a very "last resort", but using a kit that clears "fog" on headlight covers does in fact work. Again this is a really "last resort" fix to be tried in my opinion. Used it on a junk lens, and it did work, but never got the courage to try it on a slightly fogged brass lens that I once had and used.

    Thanks, Greg; we'll see if it comes to that. It's definitely a beater lens, so I wouldn't hesitate to use the strong stuff if needed.

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    Re: Cleaning A Lens of Fog

    Here's a photo of the fog; some might call it haze, but it's a filmy coating and I'd like to proceed with caution before any attempt at cleaning.

    Click image for larger version. 

Name:	100mmFog.jpg 
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