Haze removal

Started 6 months ago | Discussions
sssboa New Member • Posts: 18
Haze removal

Hi,

So I have two same 2x teleconverters by Tamron. One is clear optically and one is hazed. I dismantled the hazed one. It turned out that the haze is on one glass only out of 5 or so, situated in the middle. The hazed glass was milky. I started with an isopropanol based liquid then 99% isopropanol. This didn't do much as I expected. So I applied hydrogen peroxide, it helped just a tiny bit. I ended up soaking (bathing) the glass in hydrogen peroxide for one hour. It looked to me as some in the middle got better but I was very disappointed with the result. I put the thing together and I see almost no change from my starting point. The teleconverter is still milky when you look through it, kind of same as it was.

P.S. It is kind of haze as sometimes can be seen as a ring around edges of a lens especially on the rear element. On my glass whatever little I cleaned up it was in the middle, on the edge a very milky ring remained.

Any advice? More hydrogen peroxide soaking?

Thanks,

Andy

ProfHankD
ProfHankD Veteran Member • Posts: 8,589
Re: Haze removal

sssboa wrote:

Hi,

So I have two same 2x teleconverters by Tamron. One is clear optically and one is hazed. I dismantled the hazed one. It turned out that the haze is on one glass only out of 5 or so, situated in the middle. The hazed glass was milky. I started with an isopropanol based liquid then 99% isopropanol. This didn't do much as I expected. So I applied hydrogen peroxide, it helped just a tiny bit. I ended up soaking (bathing) the glass in hydrogen peroxide for one hour. It looked to me as some in the middle got better but I was very disappointed with the result. I put the thing together and I see almost no change from my starting point. The teleconverter is still milky when you look through it, kind of same as it was.

P.S. It is kind of haze as sometimes can be seen as a ring around edges of a lens especially on the rear element. On my glass whatever little I cleaned up it was in the middle, on the edge a very milky ring remained.

Any advice? More hydrogen peroxide soaking?

Haze can be etching from a former fungus infection... in which case nothing will remove it, although you might be able to polish it out.

Assuming it isn't that, some people say cold cream (mostly for removing fungus), but I've never tried that. Ammonia is another possibility for a soak. I'd try good old soap and water -- and an ultrasonic cleaner, which can still take a while. Be warned that ultrasonic cleaners have been known to remove coatings from lenses.

Let us know what works (or doesn't). 

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rkc Forum Member • Posts: 68
Re: Haze removal

I had a lens - I suspect it had been dunked in water at some point - with limescale on an inner surface making it look hazy. Cleaned off surprisingly well with vinegar.

Might be worth a try if nothing else is working.

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Richard

artichokes Forum Member • Posts: 64
Re: Haze removal
1

Just came across this post. Picked up a couple of lenses with a pretty severe fungal problem on the inside of the front element. looked online and found a suggestion to wipe it with a 50-50 solution of hydrogen peroxide and household ammonia. Rinse with distilled water afterwards. Worked like a charm.

Andrew S10 Senior Member • Posts: 1,650
Re: Haze removal

A lot of hydrogen peroxide is diluted to only 3%, so perhaps you need a higher concentration.

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