What a thoughtful and thorough report, Bill.
Regarding users not plagued by glare: I suspect that most simply don't often use binoculars in such trying conditions, for a variety of reasons. They don't want to get too close to the sun, can't see a target to observe in the first place, wouldn't enjoy the washed out and backlit view they'd get even if the bins didn't further compromise it, and so on.
Regarding eyeglasses: they tend to sit angled a bit from vertical, so pressing binoculars fully up against them (however natural the impulse) must tilt the barrels down, creating an optical alignment problem. Oddly enough, in recent years I became aware that I have a slight tendency to do that myself for some reason even without glasses, and have learned to correct for it.
Regarding eye relief: from a non-eyeglass point of view it can seem that manufacturers (except Leica) are already going to extremes to accommodate demands from glasses wearers, thereby (with all the compromises involved in optical design) imposing costs in performance, mass, and/or price on everyone else. Sometimes they don't even get the eyecups deep enough for the superfluous ER, and if they do, one has a tunnel-vision experience despite a decent FOV. The binoculars I grew up with in the 1960s had so little ER that my eyelashes generally oiled the oculars; holding the 15x60 close enough for viewing required actual effort. I don't know how much of its field my father, who already needed glasses then, could have seen (I never thought to ask!) but he never complained, nor did I think to; we just enjoyed using them. And today people complain about a field stop not looking quite sharp. I don't mean to sound entirely unsympathetic, but expectations (or concepts of fairness?) seem to have inflated oddly in recent years in all areas of life, and some recalibration might be in order.
Tenex,
Thanks for your comments. Much appreciated.
Regarding my glare test, I absolutely agree that it is extreme, but looking at a shadow while pointing in the direction of a bright light source is bound to happen at some point, even if briefly. The real value of the test is simply that it exposes that behavior clearly for the user, and one can then test different binoculars to see the differences in response to that type of condition. In less extreme conditions of viewing I think its safe to assume that the binoculars will still exhibit the same behavior, but at a lower level. At what threshold it makes one binocular's behavior indistinguishable from another I can't say.
Regarding my ongoing carping about eye relief, I know I'm in the minority on this issue, and have read numerous comments on this forum over the years that reflect similar points of view as yours. I get it. No one really wants 'tyranny', whether it is of the majority, or minority, wouldn't you say? As I mentioned in my post, non-eyeglass wearers have most of the entire history of binocular production at their disposal.
I do complain about this issue because I've experienced the disparity in performance and usability time and again, from my perspective. Now, when I see some manufacturers provide usable eye relief, along with wide fields, etc. I welcome it. I don't welcome the cost of it, but performance and usability, yes.
Take the Zeiss Conquest HD issue I brought up. Zeiss made up for the shortcoming of that design (for the non-eyeglass wearers) by producing longer eyecups, and gave them away. That's a manufacturer responding to a need of the majority.
Its not at all clear to me yet whether any of the big 3 are consciously thinking about eyeglass wearers as a significant clientele, but perhaps they are. If any of them want to address an aging population of users that more and more often may require eyeglasses, and keep furnishing them usable equipment, I'm all for it. I'm 65, and appreciate that I can go birding for another 3 decades or so, with binoculars that will work wonderfully for my needs.
When you say your father could not see the entire field of his binoculars and didn't complain about it, that sounds to me like cultural and social constraint operating from another era that has no bearing on this topic. Are you telling me that he wouldn't have gotten greater pleasure from them if he could have seen the entire field of view? You're basically arguing to accept the status quo, or the 'tyranny of the majority' in terms of optical design and manufacturing of that time.
That's why I'm advocating approaches like replaceable eyecups that increase usable eye relief for those that need it. Instead of a One size fits all approach, why not consider a component based system that can be modified by the user a little more than is currently available? If Zeiss could do it for the 'majority', why not for the 'minority' so to speak.
Interestingly the new 8x32 SF has more eye relief than its 8x42 counterpart, yet I can't see the whole FOV in it. How does that work? Conversely, the NL 8x32 has
less eye relief than the EL 8x32 its replacing, and I can see the whole field. I really don't think the industry is skewing heavily towards those wearing eyeglasses per se, but I believe they (primarily Swarovski and Zeiss) keep pushing performance envelopes overall, and currently this is leading towards larger, heavier, and more costly binoculars from some quarters.
I appreciate your input on this issue.
Cheers,
Bill