02-08-2011, 02:01 AM
[quote name='popo' timestamp='1297115206' post='5939']
Don't forget the effect the aperture plays. The front element(s) will be similar in size to the 300mm f/2.8 which will dominate the glass cost.
[/quote]
It's not just faster, it's also constant. As soon as a zoom becomes a constant aperture lens it's usually much larger than a variable aperture lens of the same range, even if the max aperture of the variable aperture lens is the same as the max of the constant lens.
GTW
Don't forget the effect the aperture plays. The front element(s) will be similar in size to the 300mm f/2.8 which will dominate the glass cost.
[/quote]
It's not just faster, it's also constant. As soon as a zoom becomes a constant aperture lens it's usually much larger than a variable aperture lens of the same range, even if the max aperture of the variable aperture lens is the same as the max of the constant lens.
GTW