"All it would influence would be the resolution, but only from an already damned high level to a slightly higher one" (the advantage of T*P* over just T*). I've had my 10x40 BGAT* (not P*) for many years and it's still impressive. One of my standard tests for comparing binoculars is to see if I can read the lettering on a roof aerial about 75 metres away. The Nikon 8x32SE does it best, closely followed by Zeiss Jena 8x50 Octarem, Swift 10x50 Kestrel, Zeiss 8x30 Conquest, Nikon 8x42HG, Zeiss 10x40BGAT, Hawke 8x43ED, in roughly that order (might be slightly different another day, to my eyes). I know it's just one very subjective test and doesn't prove anything, except (and this is my point) the 1980s BGAT* is still very sharp, even in such exalted company, and suits me. I was using it today to watch a Blackbird in a tree about 50 metres away, surrounded by an attentive ring of Sparrows as if listening to his evensong; no doubt there was a more mundane reason for this unlikely gathering, but it put a smile on my face...