But 24mm not wide enought leh...that is why prefer wide 18mm and a x3 zoom at 50mm rather than 24-70mm.
I logically conclude that a constant f/2.8 is not easy to do which is why such lenses tend to be more expensive and heavier too. So that being the case, they will also make the lens better as well. Its like premium 98. we know we pay more but do not need the extra octane if our car can run on 91. To justify the higher price, fuel companies reserve their "special stuff" like fuel booster ,etc for their 98 fuels only. That way you will still feel shiok about paying more for 98...right conclusin?