MicrobeHunter.com Microscopy Forum

"The entire front element or just a center part of it?" Yes, all the lens, as if it were floating on a raft making a perfect turn of 360 degrees in the same place but only when it had isopropyl in it. Always in the same place without bending to any side while turning around. BUT!!!!!!! Now is dry a...

To be able to take those images, I used an Olympus 4X lens on the front and a PL 2.5 Leitz Wetzlar lens on the back since it was the only lens capable of getting close and giving images. The problem was how the lens illuminated and I solved it by placing it on top of 2 small methacrylate cubes, whic...

More images:

Back
Front

What I see is a kind of central glass cylinder surrounded by glass that goes from the back to the front. I wish I could have photographed it, I'm sorry.

There is no oil anymore, everything is clean, but how can I seal the lens so that the oil does not enter again? I'm sorry I couldn't take the image. What can be seen is reflected in the photograph. I've tried over and over again, top lit, bottom lit, both sides lit, and sent you the best I could. Th...

Absolutely not, on Google searching for Apo Microscopic obective I found this one from Olympus, the intention was to tell you where the oil/Isopropyl was deposited. I have no idea how the lenses are arranged in that last part of this objective, since I don't want to take it apart it is impossible fo...

Forgive me Apochronaut for my doubts, remember that I am very new to this and I am trying to convey the status of the objective to you as much as possible: 1. Definitely the Isopropyl Alcohol is behind the front lens, it is deposited in the cone of the objective. To be more sure, I used a hair dryer...

Apronaut, it has been impossible for me to obtain images of what I see, so I have made a drawing of them (very far from what the eye can offer). I have been able to determine where the oil accumulated, now invaded by alcohol that little by little can be cleaned. Thank you for your patience. Dirt tha...

Stjepo, FWIW, the white dot in your photo, if repeated three times around the barrel, is likely the elastomer mentioned earlier. Digging that out may help free the entire front lens assembly. At this point, rescuing this objective is a testament to your patience and ingenuity. Don Quixote would be ...

View from the rear, lighting from above zoom from bottom to top. Next to come... if my battery get charged

Remember that I have these lenses enclosed in the barrel. I will try to get better photos but it is not an easy task. Basically, that's what I see. When I get rid of the humidity that that dew produces on the lens I will send more photos. Yes, there are "3 reflective surfaces" if the photograph is f...

"That is most likely hardened immersion oil." So there was a lot of oil inside. "It is hard to tell from the photo but I wonder if the front lens is depressed below the level of the front bezel an unnusual amount?" It doesn't seem like that to be the case if I compare it to others in good condition ...

Hobbyst46 wrote: ↑

Tue Jan 23, 2024 8:40 pm

An interesting thread. Good luck !
BTW, I would not use ammonia to clean brass metal parts.

True, but helps to clean the lens and is diluted no more than 5%, Thanks

There's some kind of glue coming off here, that's what I was referring to.

I am your man . . . Hope you let us know if it manages to improve things. Civilization is made with courageous pioneers like you :-) - both what works and what doesn't. Two thoughts, probably both of which you know. First, make sure the objective barrel is suspended in the cleaner, rather than rest...

Could be a separated enbedded front lens too. Some companies tried out cement in their earlier offerings and apparently they were not great due to immersion oil acting as a very slow solvent. That's the feeling I have, it's as if the lens insulator is dissolving because I don't see any dents on the...

I was hoping the leakage was at the seal around the bezel. The leak is through the front lens, I see that clearly. When you pour any cleaning liquid on the back it tends to drip through the front lens. I have also observed: A) Small particles are released from the edges of the lens where it makes c...

Yes, there are two lenses one above the other at a distance that gives the sensation of being a small transparent cylinder.

apochronaut wrote: ↑

Tue Jan 23, 2024 8:41 am

Unfortunately. I guess, keep your eyes peeled for an identical twin with a different problem.

Is there another identical lens?

Removing the front element(s) is often the most difficult part. Sometimes a "lens sucker" can help if the lens isn't cement or stuck in place. Since the objective is likely a goner anyway, you could also try further loosening the seal at the front and then pushing it out through the tube. That coul...

apochronaut wrote: ↑

Mon Jan 22, 2024 9:23 pm

This tiny lens you speak of. Is it mounted in the front cell, immediately behind the front lens?

Yes, mounted in the front cell, immediately behind the front lens

Apochronaut,I managed to get the barrel in order, marked the order and alignment (I hope I did it right).I found two shims at the top The front lens is stuck to the barrel and I managed to clean it but I'm afraid that there is a tiny lens (like a contact lens) in the center that does not allow a tin...

As you said, the ring was very tight, even tighter than the shroud, and it took a lot of persuasion. I had previously removed a small travel limit screw.

Now I'm looking to see if there are any external marks.

Stuck again, soaking with small drops of xylenol. The ring does not rotate.
Next to come...

Apochronaut, you are very generous in sharing your knowledge. Here is the result of your instructions. After protecting the "upper" and the "lower" side of the objective like an " egypcian mummy"and using my "special tools" I managed to open and separate its shroud that as you say "there is a remove...

Thank you Chas and Sure Squintsalot for your ideas seems not to be any screw and the lower barrel doesn't move.

A new view of my problem