.22 Krag


Here is something you don’t see often. A 1898 varmint rifle in .22 Krag with a 16X Fecker optic


    • back then internal adjustable optics were not very robust and would not track correctly and hold zero. and I think the length allowed fort higher magnifications because of positions of the lens and a bunch of other shit I dont really understand enough to speak about with any credibility

    • I can’t speak for riflescopes but I do know something about vintage scientific optics.

      The short answer is, probably, it’s so long simply due to imitations imposed by the materials and methods of the day. Modern custom-index glass is just the start. Multi-element lens design that provide chromatic aberration correction have been known for a while, but, the clarity and other optical properties of the glue used to attach those lenses to each other is dramatically better now. It was far more expensive to grind true aspheric lenses that reduce spherical aberration before the advent of CNC optical cutters and polishers. Today’s lens coatings can be custom tailored and made taking advantage of the entire table of elements, and controlled later depths to the nanometer. Et cetera. All of which issues are exacerbated the shorter the focal lengths of the lens is.

      So, use long focal length lenses, and thus long optical assemblies, to keep the aberrations under control and image quality up.


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