I recently got some usd Zeiss Conquest HD 10's. And seriously... at first.. I thought it was giving me same magification as the Vortex Vulture 15's I've got, when I was testing them back-to-back out in the Bolsa Chica Wetlands nearby.
Confused... I then went back-and-forth several more times to figure out why I had that perception.
Indeed, the 15's made the objects "bigger". And they do a pretty good job of making them sharp. BUT... the difference is that extra lil bit of sharpness and ever so slightly brighter image at distances.. and the biggest difference I finally noticed and figured out.... was that the primo glass.. it provided you with MUCH greater depth-of-field... whereas the Vultures... you needed to go back and forth with the focus knob much more because the depth-of-field (of what is currently in focus) is much more shallow.
So to me and my way of thinking, that gives these 10's a huge bonus because each chunk of the FOV as I pan and pan some more... is showing my brain soo much more image data that the pattern recognition part of your brain can then pick apart!
So now "I get it" as to why you pay for the better glass.
Confused... I then went back-and-forth several more times to figure out why I had that perception.
Indeed, the 15's made the objects "bigger". And they do a pretty good job of making them sharp. BUT... the difference is that extra lil bit of sharpness and ever so slightly brighter image at distances.. and the biggest difference I finally noticed and figured out.... was that the primo glass.. it provided you with MUCH greater depth-of-field... whereas the Vultures... you needed to go back and forth with the focus knob much more because the depth-of-field (of what is currently in focus) is much more shallow.
So to me and my way of thinking, that gives these 10's a huge bonus because each chunk of the FOV as I pan and pan some more... is showing my brain soo much more image data that the pattern recognition part of your brain can then pick apart!
So now "I get it" as to why you pay for the better glass.