Dave B Smith said:I'll also throw in a plug for an angled model. If you share your views at all, this will help tremendously.
I am afraid, I can't agree with you on this point. My brother, who is also an avid birder is quite a bit taller than I am. We love to do some joint birding if time permits. Now, he recently switched to an angled model, which allows him to use a lighter weight tripod without sacrificing stability. Occasionally, when one of us has spotted something we look through the other scope for faster location of the object. But since he has his angled scope I have more problems to even get the full picture. And most of the time now, I don't even see what I am supposed to see. I find stretching myself plus angling my head is much more uncomfortable. Thus, the argument of a more universal use is only valid if the tall guys use their scope at a less than optimal height. It may be different for those who do not need glasses. In my case, the view I finally get is one through the close-focussing part of my glasses.
But, aside from this , I still think that angled lenses are themselves somewhat of a fashion thing. (Again, following the crowd, so to speak.) They are undoubtedly better for looking up into the sky. But they are a strain on my neck for all other purposes. In addition, as one looks into the lens, the other eye is directed towards the ground (in most cases). Whereas in straight models both eyes look into the same direction and the unaided one may detect something flying by or some other activity at the same time that the other one is scanning.