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Home > Forums > VENDORS > Astro-Physics > Message #657349

Cleaning a dirty lens (was how reflective)

Posted by Roland Christen on 4/10/2009 2:51 PM   (2372 hits)
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Hi all,

Getting ready for NEAF, I pulled out my 130EDF refractor and had a look at the lens (Serial #01). I lent this scope to my friend Mark last summer, who took it to a number of star parties (Chiefland in Florida, Black Forest, Nebraska, etc). He told me that dew was heavy at all these events, and he did not have any kind of dew heater to prevent the inevitable moisture from settling on the optics. I didn't want to bring this lens to NEAF in the condition that it was in, so cleaning was in order. I am taking this opportunity to show you all how it is done.

First pix shows the lens in cell with retaining ring removed, the way it was returned to me last year (I have not had time to clean it since). Looks pretty bad, yes? In fact, the contrast was noticeably poorer than it should be for this optic. Lots of stray light surrounding a bright target image.

Rolando

Photo Attached (352KB) - Click to view

Thread:

Subject Posted By Date/Time Hits 
Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 2:51 PM 2372
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 2:55 PM 1551
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 3:04 PM 1264
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 3:13 PM 1419
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/10/2009 9:20 PM 747
Re: Cleaning a dirty lens (was how reflective) Jeff Blazey 4/11/2009 7:42 AM 658
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/11/2009 2:19 PM 550
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:48 AM 822
Re: Cleaning a dirty lens (was how reflective) Greg Nowell 4/14/2009 1:40 PM 568
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/14/2009 7:51 PM 485
Re: Cleaning a dirty lens (was how reflective) Dave Barta 4/10/2009 5:46 PM 720
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:48 AM 729
Re: Cleaning a dirty lens (was how reflective) Enrico Africa 4/10/2009 8:43 PM 549
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:46 AM 696
Re: Cleaning a dirty lens (was how reflective) Ivan Ong 4/11/2009 8:21 AM 513
Re: Cleaning a dirty lens (was how reflective) Enrico Africa 4/11/2009 11:24 AM 468
Re: Cleaning a dirty lens (was how reflective) dan kowall 4/11/2009 8:38 AM 541
Re: Cleaning a dirty lens (was how reflective) Rex Cox 4/14/2009 9:04 AM 417
Re: Cleaning a dirty lens (was how reflective) Luis Saravia Jr 4/15/2009 8:45 AM 417
Re: Cleaning a dirty lens (was how reflective) Roland Christen 5/9/2009 11:06 AM 508

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