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| p.9 #10 · p.9 #10 · Pre-order new Sigma lenses (14, 24-70, 135 & 100-400) |
Matt Grum wrote:
The Canon 100mm f/2.8L IS Macro is a whopping 25g heavier than the 100mm f/2.8 non-IS Macro....
The reality is that adding IS will not add significantly to the weight, the reason it's not done is that the lenses will sell without it. Once one manufacturer starts offering IS in all sorts of focal length/aperture combinations others will be forced to follow suit.
I was talking about really bright tele primes, f/2.8 is not bright for a 100mm (f/1.4-f/1.8 would be another story). All the light has to 'squeeze' through the IS element and this cannot have an arbitrarily small diameter; focal length and aperture are a major factor for the size of IS elements in long tele primes.
Also, while IS element size may not be relevant for robustness of the AF system, a larger and heavier IS element sure needs more power and/or more time to move into position. That's just basic physics and very relevant because of the fast response that is required. The user may not notice 25g weight increase, but if an IS element goes from e.g. 10 to 30 grams weight due to one stop faster aperture, that makes a major difference for the IS mechanism.