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  1. 8. Mai 2024 · I project my slides. Bought a kodak ektagraphic with a Golden Navitar lens (see attached). How do I tell if it's a flat field or curved field lens? Other than the fstop and focal length, the only distinguishing thing on it is the number "53586. " Also, in general, if I'm buying another lens for m...

  2. 8. Mai 2024 · Film or paper is taped to the circular wall of the box. Many pinhole photographers also make can cameras with curved film planes. In my own pinhole photography I use flat film planes. With flat film planes a pinhole has a usable circular image of approx. 125 degrees. The image diameter is about 3 1/2 times of any focal length.

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  4. 14. Mai 2024 · Aaron Naber (left), Daniele Semola (center) and Elia Bruè found a counterexample to a 50-year-old conjecture after two years of failed attempts to prove it. Over the years, Naber tried several times to prove the conjecture in full generality — for all possible dimensions, without making any of those extra assumptions.

  5. 24. Apr. 2024 · Scoliosis (plural: scolioses) is defined as an abnormal lateral curvature of the spine. It is quite common in young individuals and is often idiopathic and asymptomatic. In some cases, however, it is the result of underlying structural or neurological abnormalities.

  6. 26. Apr. 2024 · Curved-Gaming-Monitore im Test: Die besten im Vergleich. 27-Zoll-Gaming-Monitore im Test: Preiswerte Displays im Vergleich. Mobiler-Monitor-Test: Die besten tragbaren Monitore im...

  7. 14. Mai 2024 · Monochromatic light with a wavelength of 648 nm shines down on a plano-convex lens atop a plate glass. Newton's rings are seen when viewed from a superior position. (a) Radius of the 6thbright ring is 0.78cm. What is the radius of curvature of the lens? (b) Change the light to a greater wavelength; will the 6th ring be in the same ...