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Cleaning/Restoring Unitron 140 Lens assembly

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#1 jd200

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Posted 11 October 2019 - 10:05 AM

I have a 75mm Unitron refractor which is going to be 50 years old this December.  It was my first telescope.  The scope still functions albeit a bit worse for the ware.  It actually takes pretty good pictures - I used it last January for the Lunar Eclipse https://www.astrobin...7711/B/?nc=user

 

The lens assembly has some "stuff" (dust, fungus?)  in between the elements and I was wondering how to go about cleaning/restoring the lens.  I don't know about disassembling the components - I'm concerned about getting them back together with the proper spacing/orientation/etc.  The screws on the cell assembly have some sort of a coating on them which I expect is designed to hold them in place without slipping or moving.  That tells me they were adjusted to a particular spacing and then locked down. 

 

I posted this over in the Refractors group - got some good info from some folks in that group, but they suggested posting over here to try and get some Unitron-specific advice about things to be careful about when dis-assembling and re-assembling the lenses.  Any other info would be greatly appreciated.

 

 

Thanks in advance for any information you can share!


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#2 ccwemyss

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Posted 11 October 2019 - 10:08 AM

There were different 75mm cell designs. If you could post a picture it would help.

 

Chip W.



#3 jd200

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Posted 11 October 2019 - 12:12 PM

Will do!  Thanks.




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