degos said:
Don Haines said:
The more the range, the lower the quality. You can design a better 3X zoom range lens than a 4X zoom range, plus it is easier to keep it constant aperture. This was a step forward.
The 100-400 II is regarded as probably the best zoom ever made... at 4x
And there's the 24-105 which is tolerably good.
And the third-party 150-600s.
Sorry, I am not buying the "4x is too hard" excuse. Canon like 70mm because it forces sales of the 24-70 standard zooms to cover useful prime lengths, not because it is a useful focal length itself.
Given the same technology, a 3X zoom will be better than a 4X zoom. You can not compare across different manufacturers, different materials, and different accuracies of machining.
This is the same as why, given the same materials and technology, a prime is always better than a zoom.
In a zoom lens, you have to make compromises as to which focal length(s) will perform best. The wider the zoom range, the greater the compromises.
Nowhere did I say that 4X is too hard. There are several very good 4X zooms out there, and yes, the 100-400II is a very good example..... but you can not fairly compare the brand new design, modern materials, new coatings, and far more precise machining of a 2017 lens to an older lens. It is those factors that make it better than the version 1 lens that it replaces.
Similarly, you can expect to see the same range of improvement in the new 70-200F4, and I expect it to be a sharper lens than the 100-400, because it is less range, and partly because it in newer.... and if they ever come out with another 400F5.6, it will spank them both for sharpness.