Answer: Cost. Adding IS increases cost and the only way to keep these lenses affordable (they are part of the consumer line, not L line) is to reduce the aperture. Canon has the technology to do about anything, but they have to balance aperture against things like image quality, size, weight, features (IS) and cost.Sabaki said:Question: why does it seem that the apertures on proposed replacement lenses are getting smaller?
Canon EF 50 f/1.4 to Canon EF 50 f/1.8 IS &
Canon EF 85 f/1.8 to Canon EF 85 f/2.0 IS
It's as if those larger wide open apertures are undesirable but certainly the advancement in technology should make new lenses capable at those speeds?
What am I missing in this line of logic?
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