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#276 Zubenelgenubi17

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Posted 27 February 2021 - 12:01 AM

This post is going to be a bit different than the others in this thread so far. We all know the first rule of lenses: don't touch it! I recently acquired a William Optics GT102 in need of a bit of TLC. Among other things, the lens had a fair bit of schmutz on it:

before_cleaning_cropped.jpg

 

Now, my philosophy with regards to cleaning optics has always been preventative; keep the dust cap on, keep the gunk off, and the most cleaning it'll need is a puff of air every once in a while to take care of dust. This was the first time I've tried to clean a telescope objective, and I consulted a friend from my local club for some pointers. The above image was after I had already taken care of the loose dust with a blower bulb. I used an optics cleaning brush to dislodge the remaining dust particles so they wouldn't scratch the lens.

 

For the oily smudges, I first tried Residual Oil Remover with some Pec*Pads. It was slow going, and I decided to try some Eclipse optical cleaning fluid (a methanol based cleaner), and it worked great! After just a couple applications, nearly all the smudges had lifted right off. Here's the end result:

after_cleaning_cropped.jpg

 

How'd I do? Overall, I'm pretty happy with how it went, and should I encounter a gunky eyepiece or smudgy lens in the future, I now feel a bit more confident in my ability to handle it.


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#277 duck2k

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Posted 27 February 2021 - 03:12 PM

A couple of my faves!smile.gif

 

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#278 walter a

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Posted 21 March 2021 - 06:13 AM

127 f/8 oil spaced triplet

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Edited by walter a, 21 March 2021 - 07:04 AM.

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#279 walter a

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Posted 26 March 2021 - 07:09 AM

ES 80mm
Polaroscope 60mm
Carton 60mm
Equinox 80mm

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#280 Josef1968

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Posted 27 March 2021 - 02:20 PM

New Project!

 

9_inch_lens.jpg


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#281 andysea

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Posted 04 April 2021 - 08:45 PM

Here's my glass.

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Edited by andysea, 04 April 2021 - 08:46 PM.

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#282 donadani

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Posted 05 April 2021 - 01:55 PM

...and I thought apos are color-free confused1.gif

 

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#283 Polyphemos

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Posted 05 April 2021 - 02:26 PM

If you are of a sensitive nature, or of a weak constitution, you are advised not to stare directly at the following photograph:

 

 

 

buo1VvV.jpg

 

All’s well that ends well

 

7NvoJDZ.jpg

 

 

 


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#284 Rollo

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Posted 06 April 2021 - 07:48 PM

Sky Rover 102mm F/11 refractor.    

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#285 Tyson M

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Posted 06 April 2021 - 10:09 PM

...and I thought apos are color-free confused1.gif

 

attachicon.gifa2.JPG

Too much purple CA...better give one of those to me. 




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