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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   (2498 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 2498
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 2:55 PM 1615
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 3:04 PM 1321
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 3:13 PM 1487
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/10/2009 9:20 PM 787
Re: Cleaning a dirty lens (was how reflective) Jeff Blazey 4/11/2009 7:42 AM 696
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/11/2009 2:19 PM 583
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:48 AM 865
Re: Cleaning a dirty lens (was how reflective) Greg Nowell 4/14/2009 1:40 PM 600
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/14/2009 7:51 PM 521
Re: Cleaning a dirty lens (was how reflective) Dave Barta 4/10/2009 5:46 PM 757
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:48 AM 762
Re: Cleaning a dirty lens (was how reflective) Enrico Africa 4/10/2009 8:43 PM 584
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:46 AM 740
Re: Cleaning a dirty lens (was how reflective) Ivan Ong 4/11/2009 8:21 AM 547
Re: Cleaning a dirty lens (was how reflective) Enrico Africa 4/11/2009 11:24 AM 501
Re: Cleaning a dirty lens (was how reflective) dan kowall 4/11/2009 8:38 AM 577
Re: Cleaning a dirty lens (was how reflective) Rex Cox 4/14/2009 9:04 AM 445
Re: Cleaning a dirty lens (was how reflective) Luis Saravia Jr 4/15/2009 8:45 AM 450
Re: Cleaning a dirty lens (was how reflective) Roland Christen 5/9/2009 11:06 AM 538

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