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Message: <blockquote data-quote="Pinewood" data-source="post: 3837985" data-attributes="member: 10255">Hello Wachi,I recall reading a study, sent to me my Elkcub, an academic study of binocular use.  The authors found no verification for the idea that a larger binocular was held steadier because of the mass.  My personal experience among the Zeiss ClassiC 10x40, the Leica BN 10x50 and the Zeiss 10x32 FL, was that the latter was the easiest to hold steady. I have no experience with the SF binocular which is praised for its balance.  So I do not consider it a "big true," but I am not dismissing it as myth.  People differ in perception and in ergonomics.Optically, the A-K prisms have higher transmission because the prism surfaces do not require reflective coating.  The S-P design may be both more compact and lighter but it is not inherently better optically. Problems of transmission inherent in the earliest versions have been  mostly resolved  with dielectric mirrors.Happy bird watching,Arthur :hi:</blockquote>