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NIKON ACULON A211 16X50 FUNGI

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#1 AUREUSS

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Posted 22 June 2021 - 12:39 PM

Hi everyone, thanks for joining me in this wonderful community! I bought a NIKON ACULON 211 16X50 for a low price, but it has fungus. Has someone ever dismantled one of these? I tried to rotate the objective lenses tubes, but they felt firm and I didn't want to force...(There was an Oberwerk 9x60 that I unscrewed the eyepiece and cleaned it). Here in Brazil even maintenance is absurdly difficult and absurdly expensive...Thanks for any help.

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Edited by AUREUSS, 22 June 2021 - 12:54 PM.


#2 ECP M42

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Posted 22 June 2021 - 05:53 PM

Hi, Aureuss.

Honestly, I've never taken the Aculon apart. But I can try to list some points that I hope will be useful to you.

 

I guess the mushrooms are internal. In any case they die with the powerful UV rays. And in Brazil you should have plenty of them, lol.gif  leaving them in the direct midday sun, for multiple sessions. 

 

Also test with 3% H2O2 (hydrogen peroxide) and then wash with distilled H2O.

Your binoculars are "modern", so there is a high chance that the fungus will die without a trace or damage to the coatings.

 

To clean and treat it better, it is preferable to disassemble the objective cell, reaching as far as the achromatic doublet. I don't know if the cell is glued or is stopped only by a screw or glued retaining ring (maybe, only that). You have to look carefully, because from the photos I don't see enough and I don't understand what materials they used. 

 

Another alternative is to unscrew the entire lens tube from the prism body. I doubt Nikon used grains to lock it like they did for old good quality binoculars (but you first check under the rubber cover of the body). So, mark the position of the tube with the body (to go back to the same spot when you reassemble it) and then apply the right force to unscrew it.

It sees coming!

 

Once the tube is disassembled, you can try the H2O2 from inside. I doubt the fungus is between the two achromatic lenses. 

 

Somehow you should succeed without big expense.  waytogo.gif


Edited by ECP M42, 22 June 2021 - 05:54 PM.

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#3 AUREUSS

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Posted 23 June 2021 - 01:18 PM

Ranger 4,

 

Thanks a lot for the help! My big question is whether I can rotate the tube to detach it from the body and prism or if I remove the screw that holds the lens. I'm going to put them in an ultraviolet session( Dies Funge! LOL), the image is still clear and sharp and I don't think there's any noticeable bit of contrast.. Thanks a lot!



#4 Rich V.

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Posted 23 June 2021 - 01:27 PM

That the image is still clear and sharp despite the spot is the good news.  If you can prevent further damage by the fungus spreading, you're in good shape.

 

I recall bino doctor Bill Cook relating how he stuck a suction cup right in the middle of a bino's objective lens and handed those binos over to someone to look through them, unknowing of the "modification".  They didn't even notice there was a large obstruction on the one side!

 

Rich


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#5 ECP M42

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Posted 23 June 2021 - 05:23 PM

My big question is whether I can rotate the tube to detach it from the body and prism or ...

In my opinion it is easier to remove the tube, but you will work better with the lens in hand!

 

good job and good luck waytogo.gif


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#6 AUREUSS

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Posted 24 June 2021 - 08:37 AM

Thanks Cosmos and Ranger 4!



#7 AUREUSS

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Posted 25 June 2021 - 05:48 PM

Hello everyone! I noticed something strange about the nikon, the edge of the field of view was deformed. Could it be that it was the Sun, it wasn't even 26ºC, and it was pot 30 min.

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Edited by AUREUSS, 25 June 2021 - 05:53 PM.


#8 AUREUSS

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Posted 25 June 2021 - 05:56 PM

It appears to be a deformed rubber, like a ring. Wow, what will it be? Will be able to fix this?



#9 pat in los angeles basin

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Posted 25 June 2021 - 06:26 PM

Not to worry- the adventure extreme 8x40  has the same effect  as does the bushnell audbon-  I just checked the 8x40's again and the odd edge shows as rotating with the diopter adjust so it's in the eyepieces. Guessing it has to do with waterproofing...  

                                                                                                                                            Regards, Pat



#10 AUREUSS

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Posted 25 June 2021 - 07:23 PM

 thank you very much! This defect must have to do with some rubber ring, which eventually deforms.



#11 pat in los angeles basin

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Posted 25 June 2021 - 07:36 PM

Update- just checked the bushnell birder series that has the same "peculiarities" at the field stop and guess what, it's a poorly machined very thin edge on the screw in field stop! I suppose if you  are really irritated with it, you can fine sand the edge to a nice round profile but  I just live with it. Think of it as a personality "quirk" Regards, Pat



#12 ECP M42

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Posted 26 June 2021 - 01:32 AM

 thank you very much! This defect must have to do with some rubber ring, which eventually deforms.

In fact, from the photos it looks like a plastic ring that has deformed with heat.

 

cool.gif  But was it already there, before putting the binoculars in the sun? grin.gif




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