Originally posted by Gravity made by Schneider. Both produce decent quality images although perhaps not up to Pentax standards
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Schneider Kreuznach (the real company name is way longer) is nowadays not much in camera lens production (except some very special, extremely expensive lenses), but belongs to the most famous lens manufacturers worldwide.
Presently their lens production is more focused on industrial and scientific applications, but they are strong on this field.
In the past, companies like Kodak and most of the then many smaller german camera manufacturers offered their top models with Schneider-Kreuznach or Zeiss lenses. Lens names like Xenon, Xenar, and the like were well known. And they were also one of the leading producers of optical darkroom equipment.