Conversations With Ansel Adams Oral History Transcript 1972 1975
Conversations With Ansel Adams Oral History Transcript 1972 1975
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In our eReader you can find the full English version of the book. Read Conversations With Ansel Adams Oral History Transcript 1972 1975 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Conversations With Ansel Adams Oral History Transcript 1972 1975
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Say you have a company like Zeiss or Bausch & Lomb people who are making fine lenses and they have so many thousands to make of a certain kind. They build these big spheres, which have the correct spherical curvature, then the lenses are embedded in the sphere with pitch, and then another sphere of similar curvature rotates around them, grinding the lenses to proper shape. That way they get, oh, maybe fifty to two hundred done at the same time. But they have to be the right thickness; they have... to be carefully cut and "figured. " There are different kinds of glass.
Then the air one of the problems in space photography when you're in a vacuum you don't have air, so there's no refractive index in that area, like there is with air between the lens. Now, the question was whether to make the spaces between the glass a vacuum, which would mean refiguring the glass, or actually put air in there and seal it. Then the air would be under a certain pressure, and that might distort the glass. I think they ended up by re- figuring the lenses for a vacuum.
What to read after Conversations With Ansel Adams Oral History Transcript 1972 1975?
You can find similar books in the "Read Also" column, or choose other free books by Ansel Adams to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Say you have a company like Zeiss or Bausch & Lomb people who are making fine lenses and they have so many thousands to make of a certain kind. They build these big spheres, which have the correct spherical curvature, then the lenses are embedded in the sphere with pitch, and then another sphere of similar curvature rotates around them, grinding the lenses to proper shape. That way they get, oh, maybe fifty to two hundred done at the same time. But they have to be the right thickness; they have... to be carefully cut and "figured. " There are different kinds of glass.
Then the air one of the problems in space photography when you're in a vacuum you don't have air, so there's no refractive index in that area, like there is with air between the lens. Now, the question was whether to make the spaces between the glass a vacuum, which would mean refiguring the glass, or actually put air in there and seal it. Then the air would be under a certain pressure, and that might distort the glass. I think they ended up by re- figuring the lenses for a vacuum.
What to read after Conversations With Ansel Adams Oral History Transcript 1972 1975?
You can find similar books in the "Read Also" column, or choose other free books by Ansel Adams to read onlineMoreLess
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