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Equipment Discussions >> Eyepieces

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rgm40
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Loc: Western Kentucky
Eyepiece cleaning woes
      #5607507 - 01/05/13 11:19 PM

I have learned many a lesson in my 45 years of existence. Regarding eyepiece cleaning, other than learning to leave them alone and limit cleaning frequency to rare and necessary occasions, the most recent lesson I have learned is to never use anything other than a super small drop of regular Dawn dish soap, distilled water, and a cotton swab with no pressure applied, only dragging across the top lens after being saturated with the Dawn/distilled water solution. What I have learned not to do, unfortunately, is to never use "optical cleaning solution." I am not product bashing, but using pur o sol has ruined the coatings on my classic Ultima 18mm eyepiece and has left a couple of small bright spots on two others before I realized what was going on. I don't really know to what extent the damage is, because I can't tell that it has any negative effects on the view. All I know is that the 18, which is my oldest eyepiece, has several of these bright spots that I thought were just residual oil spots that were left over from the first cleaning. After about three cleanings and doubling up on the spots I figured I had done enough damage. I followed directions to the letter, using only a very light mist and microfiber lens towel. I am not a happy customer and will never let this stuff tough my eyepieces again. I am not product bashing, I can just tell you it didn't work for me, and that is a fact. It is advertised as safe for telescopes, binoculars, military optics, and a host of other things. Maybe. But it is not for me. If anyone has any idea what might have happened I would appreciate any information you would care to share. I read an article sometime ago about "contaminants" causing spots on eyepieces which was a result of the contaminant changing the composition of the coating and effectively changing the apparent color of the coating, but not actually removing the coating. This is what it looks like to me. Just lighter spots about the size of a ink pen tip or pencil lead.

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csa/montana
Den Mama
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5607534 - 01/05/13 11:33 PM

Have you tried to reclean them with Windex?

This is what TeleVue recommends:

Cleaning eyepieces


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rgm40
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Loc: Western Kentucky
Re: Eyepiece cleaning woes new [Re: csa/montana]
      #5607551 - 01/05/13 11:39 PM

No but I did try to reclean it with Dawn and distilled water. No change. Thanks for the link. I should note that I do use a bulb duster to blow off loose particles (and on rare occasions a lens brush). I do this to get rid of anything that could cause a scratch of course.


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dpwoos
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5607556 - 01/05/13 11:41 PM

Try fogging the lens with your breath and gently wiping it off with an unscented Kleenex.

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rgm40
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Loc: Western Kentucky
Re: Eyepiece cleaning woes new [Re: dpwoos]
      #5607570 - 01/05/13 11:49 PM

If nothing else works I'll try to get a picture of it. I'll post back with results of anything else I try. Keep those ideas coming

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JamesL
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5607654 - 01/06/13 01:05 AM

The link said alcohol from the hardware store is ok.
Would that be "Isopropyl" or "Denatured" alcohol?
Acetone is used to strip finishes, paint, laquer etc. Too strong in my opinion.


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dpwoos
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Re: Eyepiece cleaning woes new [Re: JamesL]
      #5607672 - 01/06/13 01:23 AM

I use 100% pure ethanol that I got from a guy I know who is a chemistry prof at a local college. Also, I believe that TeleVue knows how to clean eyepieces, and I have used acetone (as they recommend) without a problem. I wouldn't use acetone (or alcohol) on eyepieces that use plastics and/or paint, e.g. home made ones. That said, I have largely switched to ROR, finished off with a breath fogging and wiping with an unscented Kleenex. Really works well for me.

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Scanning4Comets
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Re: Eyepiece cleaning woes new [Re: dpwoos]
      #5607687 - 01/06/13 01:55 AM

I've been using a brush from the lens pen, then a blower bulb, to remove anything first then I use a Q-tip with my own solution, (90% isopropyl + a drop of dawn dish soap + distilled water, 1/2 & 1/2 solution mix), then a huff on the lens and a rub with a lens pen for years with excellent results.

I replace my lens pens every couple of months because lens pens gather debris and can re-deposit debris back onto a lens surface..... I only clean mine when I have to. I may go to the unscented kleenex for my final cleaning because lens pens are expensive to keep on buying.


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planet earth
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5607763 - 01/06/13 04:32 AM

Quote:

Just lighter spots about the size of a ink pen tip or pencil lead.




I doubt the cause was the pur o sol.
Acid dew possibly over time, storage conditions, the coatings themselves?
But yes when in doubt, change to another product/method.
My older Meade plossls have a few spots as do my old 7x50 binoculars, no effect on the view though that I can see.
Sam

Edited by planet earth (01/06/13 04:49 AM)


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Starman1
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Re: Eyepiece cleaning woes new [Re: planet earth]
      #5608208 - 01/06/13 12:06 PM

From least harmful/effective to most:
1) Water. Doesn't dissolve eyelash oils or pollen. Not recommended.
1a) Breath on eyepiece. Can't say why this is more effective than just water, but it is.
2) Pure isopropyl alcohol. Without soap added, this can't clean a lot of organic debris. Just not strong enough. Safe, though. Does a decent job on already fairly clean lenses.
3) Water/soap/alcohol mix (like ROR). Very effective to remove organic contaminants. Doesn't clean everything off eyepieces, though, without multiple cleanings. I had some thick mascara streaks that required several cleanings with something harsher.
4) Acetone. Much better solvent. Not harmful to lenses, but can dissolve plastic. If the cleaning is anywhere near a plastic baffle or rubber eyecup, don't use it. It's quite safe on all-metal eyepieces, though, and cleans off some stains that other cleaners can't.
5) Methyl Ethyl Ketone (MEK). This will take off ALL substances on the lens and requires ventilation for safety. It has removed mildew and chemical stains where nothing else would touch the discolorations. It won't harm the lenses with short-duration contact, but I only recommend it if the eyepiece has what looks like mildew or rust discoloration on the lens (likely to be a classic eyepiece being restored after disassembly).

It might interest you to know that I have tried, just for the sake of an experiment, cleaning brand new eyepieces right out of their boxes. Guess what? They got cleaner. Noticeably. It seems that many companies don't maintain perfect cleanliness in assembly one the eyepiece is put together. I've even seen a brand new eyepiece come out of the box with a fingerprint on the eye lens (!).

People on this forum are obsessed with picayune details that distinguish one eyepiece from another, but seldom address the possibility the eyepieces being tested might not be clean. Though one could become obsessed with cleaning, a judicious amount of cleaning at regular intervals or whenever anything foreign is seen on the lenses is definitely called for. Done right, no damage will result, and the eyepiece will be cleaner.

Most often, I see little tiny dots that probably are from the eyelashes touching the eye lenses or from accidentally breathing on the eyepiece lens. I don't let those sit because if left in place they can cause permanent damage to the lens coatings in time. But if there appears to be small shiny dots on the eyepiece, they are probably cleanable. The small dots I've seen that were where small dust particles present on the lenses interfered with the coating process were all invisible to the eye and only visible through a 20X loupe or microscope. I suggest you NOT inspect your eyepieces that way unless you realize that nothing is perfect.

If you get pure alcohol or acetone, make sure they are "reagent grade" or as pure as you can find. No additives. I've been able to find 90% pure IPA and 90+% pure acetone in local stores. ROR works great 99% of the time.


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johnnyha
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Re: Eyepiece cleaning woes new [Re: Starman1]
      #5608292 - 01/06/13 12:50 PM

6) Human spit. Ultimate remover of organic compounds from glass.

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bremms
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Re: Eyepiece cleaning woes new [Re: johnnyha]
      #5608349 - 01/06/13 01:14 PM

I never use the dish liquid on lenses unless it's out of the housing. It requires too much liquid to clean it off properly.
Acetone and IPA seem to work on different oils. Maybe an IPA, acetone, and dist H2O mix. Cleaning soulutions are like talking about oils on an automotive forum..


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bremms
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Re: Eyepiece cleaning woes new [Re: bremms]
      #5608360 - 01/06/13 01:16 PM

I blow them off with filtered compressed air.

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frito
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Re: Eyepiece cleaning woes new [Re: bremms]
      #5608491 - 01/06/13 02:11 PM

electronic component stores may carry highly pure alcohol, i get mine from fry's electronics its made by MG Chemicals and its 99.9 something pure. apparently too pure for california because on the bottle it states that you must dilute it 25% by weight with water or acetone to legally use it in this screwy state

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Mirzam
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Re: Eyepiece cleaning woes new [Re: frito]
      #5608530 - 01/06/13 02:31 PM

First be sure that there is no gritty material on the lens surface that could scratch the coatings. Use a Q-tip with alcohol to remove any visible particles.

Next, I use one or two Zeiss lens cleaning tissues, which come impregnated with a small amount of pure alcohol. You don't have to be super careful with these as they will not force any alcohol between the lens elements. Usually the wipes leave a bit of residue, which I remove by fogging the eyepiece lens by breathing on it, followed by wiping with a small section of Viva paper towel. These towels are soft and not contaminated with perfumes or oils. To avoid introducing oils from my own hands I am careful not to touch the Zeiss wipes or the paper towel with my fingers except in places that will not directly contact the lens.

This method has worked well on eyepiece lenses and objectives up to 8" in diameter.

JimC


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Achernar
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Re: Eyepiece cleaning woes new [Re: JamesL]
      #5608662 - 01/06/13 03:42 PM

Denatured alcohol is what I use, it removes oils and other stuff without harming glass. I use clean Q-tips dipped in it, eyelash oil and film is removed and it doesn't have the plastic attacking properties that acetone does when it's ethanol mixed with methanol.

Taras


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wky46
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Re: Eyepiece cleaning woes new [Re: Starman1]
      #5608953 - 01/06/13 05:54 PM

Don, those are all excellent points (as always). Especially the one you make regarding evaluations between ep's that may not be clean. I've often wondered about this too. Maybe any future reviewers, whether it be a shoot-out between several ep's or simply a review of a single ep, should state they've all been cleaned first (regardless of how they 'look'). I've played many and have owned several high-end guitars in 40+ years of playing and MOST critizisms of tone directed at certain guitars are usually (I'd bet money on it) the result of strings that are old and have lost their tone and timbre. Anytime I read a review now of guitars (acoustic generally) I want to know if their using new strings (unfortunately something which they never say)

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GeneT
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5608995 - 01/06/13 06:26 PM

Quote:

Regarding eyepiece cleaning, other than learning to leave them alone and limit cleaning frequency to rare and necessary occasions,




This is difficult lesson for all of us to learn regarding all of our optics. There are times optics should immediately be cleaned. However, too often more problems occur from over cleaning than cleaning too little.


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tag1260
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Re: Eyepiece cleaning woes new [Re: Scanning4Comets]
      #5609136 - 01/06/13 07:55 PM

What about the eyeglass lens cleaning solutions that are available to clean your glasses?

I'm not a chemist but here's the MSDS of the stuff I'm talking about.

http://www.calaccessories.com/MSDS_Sheet.pdf


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bremms
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Re: Eyepiece cleaning woes new [Re: tag1260]
      #5609387 - 01/06/13 10:41 PM

Really just water with a little alcohol and photo flo.

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Paul G
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5617353 - 01/11/13 02:18 PM

I take the other approach and inspect and clean my eyepieces after each night of use. A small speck or spot that would be insignificant on the objective can affect a noticeable portion of the image if that same spot is on the eyepiece. The other reason to clean regularly is that some surface contaminants can become much more difficult to remove once they have been sitting there for a while.

As Johnny posted I would try saliva on the pad of your finger, it will clean organics off the glass that nothing else removes and the clean pad of your finger is very soft and friendly to glass. Just be sure to clean the saliva off before it dries or it will leave a difficult to remove stain.

If that doesn't work, try Kodak lens cleaning solution, Zeiss lens cleaning solution, acetone, methanol, or MEK (in that order).


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tomcody
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5647720 - 01/28/13 10:01 AM

I have seen the small spots you refered to when cleaning. They have always been the result of contaminated cleaning cloths, the most recent example, ( I start cleaning by blowing off the lens with a bulb blower followed by brushing the surface with a Edmund Optics lens brush to loosen any particles along the edge of the lens, then blowing again), was caused by ( eyelash oil? ) contamination on the brush. Cleaning the brush with alcohol fixed that issue. I would be very suspicious of any lens cleaning cloths that were not new out of the package. Purosol is a very good cleaner but remember, any cleaner just suspends the oil or grease and that can find its way onto the cleaning cloths etc to be re-deposited again.
Rex

Edited by tomcody (01/28/13 10:02 AM)


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Starman1
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Re: Eyepiece cleaning woes new [Re: tomcody]
      #5647785 - 01/28/13 10:48 AM

Quote:

I have seen the small spots you refered to when cleaning. They have always been the result of contaminated cleaning cloths, the most recent example, ( I start cleaning by blowing off the lens with a bulb blower followed by brushing the surface with a Edmund Optics lens brush to loosen any particles along the edge of the lens, then blowing again), was caused by ( eyelash oil? ) contamination on the brush. Cleaning the brush with alcohol fixed that issue. I would be very suspicious of any lens cleaning cloths that were not new out of the package. Purosol is a very good cleaner but remember, any cleaner just suspends the oil or grease and that can find its way onto the cleaning cloths etc to be re-deposited again.
Rex



Which is why new q-tips, disposed of after one wipe of the lens surface, remains the easiest way to clean an eyepiece lens: guaranteed clean upon application to the lens, quite absorbent, and easy to manipulate into the "corners".


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BillP
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Re: Eyepiece cleaning woes new [Re: johnnyha]
      #5648312 - 01/28/13 02:17 PM

Quote:

6) Human spit. Ultimate remover of organic compounds from glass.




Exactly!!! Did this last evening...no solvent was getting the spots off, until I put some spit on it...then right off it came

One also has to remember when there are "spots" to be removed to be patient. Don't expect instant gratification by applying and then immediately taking off. Put a dab of the alcohol or saliva on and let it seit for 30 seconds or more, then wipe. takes some time for the chemical/enzyme reactions to occur and loosen things up.


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ibase
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Re: Eyepiece cleaning woes new [Re: BillP]
      #5649694 - 01/29/13 04:26 AM

Quite surprised to read the original post on this thread because I've been using Purosol to good results on my EP's. So I experimented and did exactly as described by the OP with my own Ultima 18mm (old classic) just like the one cited on the OP; here's the result:


Ultima 18mm newly cleaned with Purosol

There were no bright spots or anything not normal on the Ultima 18 eye lens after being cleaned with Purosol, just clean glass with its coatings perfectly intact as has always been the result when I clean my other EP's using Purosol. Really puzzled what happened to OP's Ultima 18mm/other EP's.

Best,


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rgm40
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Re: Eyepiece cleaning woes new [Re: ibase]
      #5651140 - 01/29/13 08:48 PM

I just couldn't resist using the Purasol again. Like most following this thread, I just couldn't believe the purosol would create the problem I described in the OP. First, I tried cleaning a "new" TV smoothie 17mm PL with my tried and true method of the cotton balls/distilled water/drop of Dawn. Guess what, I developed one of those spots and thought I had damaged coating. That sinking feeling set in again. I could not get it off even after two or three tries. I put it away, somewhat disgusted, and slept on it. The next night after work, I went to the store and purchased some Q-tips. Came back and tried the Purasol and Q-tip on the TV. After a couple of tries I achieved some measure of success. The really bright speck was gone. There seemed to be a very very slight degree of streaking left over which was taken care of by the cotton ball/water/dawn method. Results: like new. Whew. Decided to get the 18mm Ultima back out and give it another go with the Purasol. After about 4 or 5 tries I may have reduced the brightness of the spots just a bit, but they are still there. I am starting to think that perhaps some stubborn contaminants build up around the edge of the top lens, and get broken loose and deposited on the eyepiece when cleaning as many have said. I have changed my opinion of the Purasol and no longer believe this was the problem. My apologies to my bottle of Purasol I tried breath/fog Q-tip method and no luck. I tried the spit method and no luck. I am thinking of trying some 91 percent Alcohol next, or perhaps some ROR as Don suggests. I am really trying just to leave it alone but it is bugging me to death

Edited by rgm40 (01/29/13 09:25 PM)


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Starman1
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5651149 - 01/29/13 08:53 PM

Try ROR (ror.net).
It took mascara off (an eyepiece) that alcohol wouldn't touch.


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Jim Rosenstock
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Re: Eyepiece cleaning woes new [Re: rgm40]
      #5651191 - 01/29/13 09:21 PM

Whatever's left of that little spot is unlikely to affect your views at all.....but I understand, it bugs you anyway!

Well, just be careful that your cleaning efforts don't cause any added damage...be cautious and don't do anything crazy!

One quick "war story"...a few years ago I bought a nicely-priced eyepiece from a guy who had cleaned it with R-O-R, a preferred formula at the time. He noted that there was a small sleek (not affecting viewing) that the R-O-R would not remove, and if it bothered me, I could return it. Well, a Q-tip dipped in 91% Isopropyl cleaned it right up, first swipe!

I rarely use anything other than 91% Isopropyl on my eyepieces. It works for me.

Jim


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Starman1
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Re: Eyepiece cleaning woes new [Re: Jim Rosenstock]
      #5651438 - 01/30/13 12:16 AM

What's in ROR from their MSDS sheet:
Ammonia 26° 0.775%
Sodium Chloride 0.830%
Isopropyl Alcohol 4.266%
Liquid Soap 9.011%
Distilled Water 85.118%

Obviously, it's the soap that removes the organic materials.
Change the alcohol and water contents, and it might be even better.
But I've cleaned a lot of eyepieces with 70% isopropyl, and ROR works better.
But it might be possible to improve on ROR by adding IPA to it.


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Lt 26
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Re: Eyepiece cleaning woes new [Re: Starman1]
      #5651915 - 01/30/13 09:46 AM

Fogging as a final step always worked for me. Would not advise using ethanol made from corn in America. Very corrosive stuff when exposed to moisture. Which is why they have a hard time getting the mix over 10% and pay out the nose when they do. Not the same stuff they make in Brazil.

Dereck


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dedo
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Re: Eyepiece cleaning woes new [Re: Lt 26]
      #5652030 - 01/30/13 10:56 AM

I too have had the bright spots problem, even on the inner lens of a brand new triplet objective...go figure! So far, what has always worked for me is a brand new lenspen. I used it to clean, very carefully, many many lens surfaces, from eyepieces to mak's meniscus to big lenses, always with great success without the smallest damage in a single pass whic, IMO, is far less dangerous than trying again and again with q-tips or whatever else.
Yes, the finger pad is absolutely safe, saliva too and is very efficient but there just are things, such are those bright specks, for what that isn't enough unless you keep pass on it, which I think is less safe than using a brand new lenspen in a single pass.
Acetone works wonders too, but it is not very safe on the edges where it can dissolve cell's paint, rubber and more taking them on the lens surface.
Just my experience.


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dcoyle
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Re: Eyepiece cleaning woes new [Re: dedo]
      #5652197 - 01/30/13 12:15 PM

I would be very leary of using one's finger pad for fear there is some grit of some sort embedded in it. IMO, same for a lens pen, the second stroke.

I use the air bulb on an EP after every session. If there is more than a tiny amount of stuff on the lens, I use a q tip, in a "roll up as you go forward" motion, with fluids. One use and throw away. The trick on using q tips is you don't want to advance the q tip so fast as to leave a trail of liquid behind. This is particularly tough in very dry climates.

I try the weaker fluid first.

I avoid IPA from the drugstore after a weird experience with using a drugstore IPA that left a film that even acetone wouldn't take off. (it did come off with lighter fluid, which I tried in desperation.)

For me, the hierachy is ROR, Purosol and acetone.

I only use q tips when the lens is too small to use toilet paper. I spray the solvent on the paper wad and then use the same roll up motion, once, and throw away.

Avoid observing under trees!

Dan


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kevint1
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Re: Eyepiece cleaning woes new [Re: dcoyle]
      #5652737 - 01/30/13 04:44 PM

I got a new pair of glasses with anit reflection coatings a few weeks ago. As usual, I received a bottle of cleaning solution and a package of micro fiber cloths with the glasses. Has anyone used this type of cleaning solution on their eyepieces? I'm not sure what's in it, but I have never had a problem with it on my eyeglasses.

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Starman1
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Re: Eyepiece cleaning woes new [Re: kevint1]
      #5652761 - 01/30/13 04:54 PM

Those cleaning solutions are usually mostly water with a little soap and alcohol added, and sometime a dye or scent.
They can clean eyepieces (spray a q-tip and then apply to the eyepiece, don't spray the eyepiece), and do a fairly good job of lifting eyelash oils.
However, they typically have a higher soap content than most commercial eyepiece cleaning solutions, so when they dry there can be some soap residue on the lens.
If so, a q-tip and water cleaning gets it right off.


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palmer570
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Re: Eyepiece cleaning woes new [Re: Starman1]
      #5664632 - 02/06/13 03:38 AM

I'm bummed a little now.

After reading Starman's post about eyepieces may need cleaning when new I checked my new ES82's.
All looked pretty good till I looked at the bottom of my
30mm. Had small smudges right in the middle and at first thought it was a finger print from manufacturing. But realized the glass is very close to the rubber cap and the cap was leaving the smudges either from me touching the cap when it was on, which I highly doubt, or from storing standing up in my eyepiece storage case.

So going to pick up some hard caps and get rid of the rubber and also store it laying down for now. Love the ES82's I have but the rubber cap seems like a oversight.

Edited by palmer570 (02/06/13 03:42 AM)


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dcoyle
professor emeritus


Reged: 10/11/05

Loc: Turbulent but dark skies, N.M.
Re: Eyepiece cleaning woes new [Re: palmer570]
      #5665006 - 02/06/13 11:10 AM

I noticed the same problem on the 30/82 ES bottom cap, and replaced it with a hard TV cap.

Dan


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Traveler
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Reged: 08/19/07

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Re: Eyepiece cleaning woes new [Re: dcoyle]
      #5666439 - 02/07/13 03:30 AM

Am I the only one who use Optical Wonder (Baader and Astro-Physics) with great succes? Click link for more information.

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spencerj
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Re: Eyepiece cleaning woes new [Re: JamesL]
      #5666690 - 02/07/13 09:24 AM

Quote:

The link said alcohol from the hardware store is ok.
Would that be "Isopropyl" or "Denatured" alcohol?
Acetone is used to strip finishes, paint, laquer etc. Too strong in my opinion.




Acetone will eat plastic and you don't want to spill any on your stained kitchen table, but it is an incredible optical cleaner.

Before I found the Televue instructions for acetone cleaning, I tried a number of cleaners and methods and was never really happy with the results. There was always a streak or residue and I felt like I had to go over the optical surface multiple times (risking damage). I have certainly scratched more than one eyepiece using a "lens pen" or "micro fiber cloth".

For the last five or six years, I have used acetone exclusively to clean optics. I use it everyday to clean my glasses--plastic lens with coatings. It only takes one pass to make them pristine with no residue left behind. I get the same results on all my optical telescope equipment (accept mirrors). Again . . . just keep it away from plastic (rubber is not an issue) and wood finishes.


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csrlice12
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Re: Eyepiece cleaning woes new [Re: spencerj]
      #5666830 - 02/07/13 10:50 AM

I finally just purchased a bottle of Purosol and removed all doubt.....

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Kent10
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Re: Eyepiece cleaning woes new [Re: spencerj]
      #5666961 - 02/07/13 11:58 AM

Quote:

I tried a number of cleaners and methods and was never really happy with the results. There was always a streak or residue and I felt like I had to go over the optical surface multiple times (risking damage).




Hi Jason:

Which solutions did you try that you weren't happy with? Did you try the Baader Wonder Fluid. Unfortunately I don't think we can get it in the US but it is supposed to be very good. I am also wondering if you tried Eclipse which is methanol. It has gotten great reviews and I just ordered some to clean my TEC objective. I also considered the acetone after reading the Televue article but decided to try the Eclipse first. Thanks, Kent


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Kent10
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Re: Eyepiece cleaning woes new [Re: Kent10]
      #5667377 - 02/07/13 04:04 PM

I have another question for you, Jason or anyone else using acetone. Roland Christen on AM wrote this "The acetone by itself will not clean anything off, but it will remove the faint swirl marks thta are left behind by the other cleaning agents." http://www.astromart.com/forums/viewpost.asp?forum_post_id=657356&poll_id...

I thought acetone was amongst the best to clean optics but here he says by itself it won't clean anything off. Do you know what he means by that. He only uses it last to get rid of the swirl marks left from the other cleaners. Thanks

Edited by Kent10 (02/10/13 09:16 AM)


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csrlice12
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Re: Eyepiece cleaning woes new [Re: Kent10]
      #5667447 - 02/07/13 04:36 PM

It evaporates totally away.

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Starman1
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Reged: 06/24/03

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Re: Eyepiece cleaning woes new [Re: Kent10]
      #5667487 - 02/07/13 05:02 PM

Acetone is highly volatile. Though it can dissolve a lot of contaminants on the glass, it evaporates so fast the contaminants are left behind unless wiped up at almost the same time the surface is made wet (as with a Q-Tip).
So, despite the fact most contaminants are easily dissolved in a solvent, the removal of the contaminants from the glass requires a surfactant to separate the dissolved contaminants from the glass, and an absorbent medium to wipe the dissolved contaminants and surfactant away from the glass and some form of medium that isn't so volatile it evaporates immediately. It's one of the reasons ROR is so effective: alcohol, ammonia, water, and soap. It doesn't dissolve too fast, so you have time to wipe it up.
I agree with Christen on acetone. It seems to be very effective at eliminating any swirls left from previous cleaning.


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Kent10
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Re: Eyepiece cleaning woes new [Re: Starman1]
      #5667515 - 02/07/13 05:16 PM

Thanks Don. Very interesting. To clean my objective I ordered Eclipse along with Pec Pads and Opto-Wipes which I believe Roland C also recommends. Would you say then that when using Acetone it would be better to use the Opto-Wipes which are absorbent rather than the Pec Pads which are not. Eclipse is mostly methanol I think so I wonder if that evaporates quickly like the Acetone and leaves the contaminants behind. Thanks again.

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EJN
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Reged: 11/01/05

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Re: Eyepiece cleaning woes new [Re: Kent10]
      #5667521 - 02/07/13 05:22 PM

I boil my eyepieces in antifreeze. The full strength type, not the 50-50 mix.
That removes *everything*


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Scott in NCModerator
Mad Hatter
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Reged: 03/05/05

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Re: Eyepiece cleaning woes new [Re: EJN]
      #5667625 - 02/07/13 06:29 PM

Quote:

I boil my eyepieces in antifreeze. The full strength type, not the 50-50 mix.
That removes *everything*




Boil?


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GeneT
Ely Kid
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Reged: 11/07/08

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Re: Eyepiece cleaning woes new [Re: johnnyha]
      #5667963 - 02/07/13 10:13 PM

Quote:

6) Human spit. Ultimate remover of organic compounds from glass.






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GeneT
Ely Kid
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Reged: 11/07/08

Loc: South Texas
Re: Eyepiece cleaning woes new [Re: rgm40]
      #5667973 - 02/07/13 10:23 PM

Quote:

learning to leave them alone and limit cleaning frequency to rare and necessary occasion




Wiser words never spoken!


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rgm40
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Reged: 04/15/08

Loc: Western Kentucky
Re: Eyepiece cleaning woes new [Re: GeneT]
      #5676537 - 02/12/13 08:29 PM

After all those cleanings I have decided to leave it alone. After all said and done I do have a couple of specks that I could not get off using the Dawn method or Purosol, but I gave the eyepiece a good night out with the scope and the eyepiece performed like a champ. Did not notice any distortions whatsoever.

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orion61

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Re: Eyepiece cleaning woes new [Re: dpwoos]
      #5676566 - 02/12/13 08:45 PM

Quote:

I use 100% pure ethanol that I got from a guy I know who is a chemistry prof at a local college. Also, I believe that TeleVue knows how to clean eyepieces, and I have used acetone (as they recommend) without a problem. I wouldn't use acetone (or alcohol) on eyepieces that use plastics and/or paint, e.g. home made ones. That said, I have largely switched to ROR, finished off with a breath fogging and wiping with an unscented Kleenex. Really works well for me.



I think I saw the guy you got the 100% ethanol from on the show Moonshiners, My Grand pappy was rumored to be involved in that hobby.
I got some micro fiber cloth at the Dollar Store and they
pull the smudgies and oil right off.
You can try the eyeglass cleaning cloths at the local Pearle too.
I also suggest a soft Camels hair brush to lightly remove dust.
The one drawback to using RKE eyepieces (or other Kellners)
is the field stop is right on the bottom lens and anything is magnified.


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ben2112
scholastic sledgehammer


Reged: 07/12/12

Loc: North Charleston SC
Re: Eyepiece cleaning woes new [Re: orion61]
      #5684530 - 02/17/13 01:12 AM

So, would it be safe to use those disposable cleaning pads for eyeglasses? I picked up a box of Zeiss Lens cleaning pads from Sam's club. I got them for my eye glasses. They are freakin dirt magnets. I know you should get grit off first before doing any real cleaning. Like use a lens blow bulb or q-tips..

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