HD Optics. Yea, I know all the marketing pitch, but I have had the opportunity to extensively compare Leica Ultavid HD and Non- HD in 12X and the same for Meopta Meostars. I have old eyes but for the life of me I cannot tell any difference in HD and non-HD. I would like to hear opinions from other users who have actually compared identical brand and powers of HD and non-HD.