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Home > Forums > ASTRONOMY EQUIPMENT > Refractors > Message #405916

Re: Oil vs Air Spaced Lens Elements

Posted by Roland Christen on 1/10/2006 2:02 AM in response to Oil vs Air Spaced Lens Elements   (781 hits)
 Prev Post Next Post 

Oil does not go opaque.

The reason I went to airspaced has to do with the availbility of glasses to achieve zero color. In a triplet oil spaced, you can do this with fluorite in the center because two mating glasses exist that will cancel the color error and the spherical. With ED glass, you cannot cancel both the color and the spherical at the same time. Therefore you either have to use an airspace or you have to use an aspheric surface if you want to do oil spacing, or you have to allow some color error in the blue-violet end of the spectrum. An airspaced ED lens will achieve the same or better color correction than an oil spaced fluorite lens.

Roland Christen

Thread:

Subject Posted By Date/Time Hits 
Oil vs Air Spaced Lens Elements Hans Tucker 1/10/2006 1:54 AM 599
Re: Oil vs Air Spaced Lens Elements Roland Christen 1/10/2006 2:02 AM 781
Re: Oil vs Air Spaced Lens Elements Dmitri Kulginov 1/10/2006 3:40 AM 539
Re: Oil vs Air Spaced Lens Elements John Biretta 1/10/2006 6:58 AM 497
Re: Oil vs Air Spaced Lens Elements Mark Branch 1/10/2006 7:11 PM 398
Re: Oil vs Air Spaced Lens Elements Jim Brown 1/11/2006 12:57 PM 322
Re: Oil vs Air Spaced Lens Elements Roland Christen 1/10/2006 11:36 AM 643

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