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Firstly, larger objective does not affect field of view. It only affects amount of light collected. Check out vertex lht 42mm and 50 mm specs, and leupold vx5hd 44mm and 56mm specs, same model...

More than 7 is wasted , but not "any less than 7 is less than ideal". 7mm is the maximum. Not everyone can do 7mm, and as people age, eyes can no longer open to 7mm. therefore quite often even a 7...

Larger tube is helpful for two things - housing larger internal parts for more adjustment range, and slightly stronger scope when you have ever-increasing larger and more glasses inside. When you...

"HD" glass means High Density glass. Wikipedia says this: "The density of soda glass is 2.4 g/cm3 (39 g/cu in) or below, while typical lead crystal has a density of around 3.1 g/cm3 (51 g/in3) and...