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Message: <blockquote data-quote="Renze de Vries" data-source="post: 2317369" data-attributes="member: 10024">Frank,I share your concern with FoV in todays binoculars. It seems the concept of ‘wide angle’ is something of the past, a lost art, or maybe I’d rather say a lost concern. At some point in time manufacturers seem to have agreed on 60 deg. AFoV as sufficient for  a satisfying view. The great majority of efforts to make us happy have since been in accord with this (debatable) standard.I think that if we want something more from our manufacturers we have to express our dissatisfaction, criticize the wide angle standard, redefine the norm.However I feel that this is something quite different from what you’re up to in this thread, if I’m not mistaken: clarification, sharpening up the concepts used by us to describe the visual experience as clear, as specific, as useful as possible. Great. Because it can be a mess. Take sharpness for instance: it’s often completely obscure whether people are referring to sharpness across the field of view or to center field resolution. Again, I’m happy with your concepts Object performance and Field performance. I’m happy as well with David’s addition of Practical performance. But as I like to see the concepts as discrete as possible, I can’t see anything being gained in the concept of Overall performance. My impression is that Overall performance will be the place where the reviewer summarizes his findings, discloses his thoughts on how certain factors are balanced and – probably – will tell us whether or not he likes the instrument. In this way I think the concept of Overall performance will be used for generalization and subjective opinion, more than for specific observation. Now I’m very well aware of the inevitability of all this, but my point is that we shouldn’t regard the concepts of Object performance, Field performance and Practical performance as being on the same level as Overall performance. And because of this, I say: let’s drop the Overall performance concept. Really, no harm is done. Let’s call it Summary and everything’s fine.Renze</blockquote>

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