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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   (2734 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 2734
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 2:55 PM 1746
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 3:04 PM 1445
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/10/2009 3:13 PM 1603
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/10/2009 9:20 PM 837
Re: Cleaning a dirty lens (was how reflective) Jeff Blazey 4/11/2009 7:42 AM 738
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/11/2009 2:19 PM 627
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:48 AM 927
Re: Cleaning a dirty lens (was how reflective) Greg Nowell 4/14/2009 1:40 PM 634
Re: Cleaning a dirty lens (was how reflective) Luke Leege 4/14/2009 7:51 PM 547
Re: Cleaning a dirty lens (was how reflective) Dave Barta 4/10/2009 5:46 PM 796
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:48 AM 809
Re: Cleaning a dirty lens (was how reflective) Enrico Africa 4/10/2009 8:43 PM 618
Re: Cleaning a dirty lens (was how reflective) Roland Christen 4/11/2009 7:46 AM 787
Re: Cleaning a dirty lens (was how reflective) Ivan Ong 4/11/2009 8:21 AM 576
Re: Cleaning a dirty lens (was how reflective) Enrico Africa 4/11/2009 11:24 AM 530
Re: Cleaning a dirty lens (was how reflective) dan kowall 4/11/2009 8:38 AM 605
Re: Cleaning a dirty lens (was how reflective) Rex Cox 4/14/2009 9:04 AM 470
Re: Cleaning a dirty lens (was how reflective) Luis Saravia Jr 4/15/2009 8:45 AM 493
Re: Cleaning a dirty lens (was how reflective) Roland Christen 5/9/2009 11:06 AM 586

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