All Serno's start with capital E which stands for 4ĬAMEROSITY - 1234567890 (use this coding to find year of production.) But it does take a lot off a hero's mind!" " The K-24 is no hero - the men who do the flying play that role. Starring the K-24 with the Kodak Aero-Ektar f2.5 7in (178mm)ġ944 Ad K-24 Kodak Aircraft Camera Bombardier Gunner To make it into the 12 in (305 mm) f2.5 version, multiply all dimensions
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To make it into the focal length 178 mm, multiply all dimensions byġ.78. This way they can compare designs with a standard focal It is a tradition among optical designers to present lens designs for the focal (Aklin/Kodak) it is a seven element Biotar type. USA by Eastman Kodak Co., Rochester, N.Y. The Kodak Aero Ektar is a well know variant of six element Double Gauss designs. Almost all the high-aperture lenses supplied on Japanese cameras are modification on the Planar. The planar was used as a base for lens derivatives, though in asymmetric form. Due to it's complexity and high number of transmission surfaces, it really did not come into it's own until coating was developed. Not widely used until coating processes were available, due to light loss from the large number of transmission surfaces causing very low contrast. Rudolph also inserted a "buried surface" into the thick negative elements of a cemented interface separating two type of glass having the same refractive index, but different dispersive powers. Rudolph thickened the negative elements and reduced the airspace as much as possible, which corrected the spherical aberration and the sagittal/ tangential astigmatic aberration.
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The normal wide airspace separating the positive and negative elements in the double gauss design made a large amount of spherical aberration. Symmetrical optical configuration producing low spherical aberration and astigmatism. Paul Rudolph in 1896 based on the double Gauss design (in 1817, C F Gauss described a telescope objective consisting of a pair of meniscus shaped elements, one positive, and one negative.) The design was 4 groups of 6 elements, and a flat field design. One man's junk is another man's treasure!ĭesigned by Dr.