Hi,
does anyone know why even the BEST zoom lenses can only have f2.8 as their maximum aperture, and never any bigger?
Is it because of a rule of thumb? i.e. f2.8 is the sweet spot between light entering lens and DOF which most pro. photographers want?
Or is it because of technical limit of the manufacturing process? i.e. the more glass elements, the more difficult to get max light entering, so f2.8 is largest aperture of a zoom lens?
Is there any article on this?
Or is there any zoom lens with greater max aperture than f2.8?
does anyone know why even the BEST zoom lenses can only have f2.8 as their maximum aperture, and never any bigger?
Is it because of a rule of thumb? i.e. f2.8 is the sweet spot between light entering lens and DOF which most pro. photographers want?
Or is it because of technical limit of the manufacturing process? i.e. the more glass elements, the more difficult to get max light entering, so f2.8 is largest aperture of a zoom lens?
Is there any article on this?
Or is there any zoom lens with greater max aperture than f2.8?