I have no idea where you are getting your information but 24-70mm G2 is sharp through the whole range. At least my carefully adjusted copy is. This one below I shot today maybe not be completely wide at F3.5 but close enough.
And 100% crop
Which is not even 1mp. It looks pretty sharp to me considering that it is a snap shot really. And it is not even in the center of the frame.
The difference between G1 and G2 is that G2 has more effective consistent focus. With G1 I had 90-93% keepers while with G2 I get at least 99%.
Then the fact that it's not that sharp wide open and that the Nikon is much sharper wide open. If I was to spend money on a new G2, I would rather just get a used Nikon non VR version. They can be had for the same price or a bit less than a brand new G2.
And you will also get much slower focus speed. G2 literally focuses instantly. Tamron is done really good job on this.
G1 sounds like a bargain for under $1000cdn, however I am concerned about the build quality. Hence why I need the warranty.
I had G1 for about 4 years of abuse. Sold it few months ago in almost new condition.
G2 I had to wrap in the vinyl because I afraid it will be scratched easily just like 70-200mm G2 I already scratched. Tamron repaired it it for free but I can't keep sending them to Tamron because I use them almost every single day.
I've never felt the G1 in my hands before but is it soft like butter? Does it feel super cheap and fragile?
No, not at all. As far as finish is concerned carbonate material is better than metal. It doesn't scratch, doesn't shrink or expand with temperature change and it absorbs shocks very well.
G2 yes is better and is weathersealed but still, the G2 has super cheap paint on them that is very easy to mark up.
That is why I wrapped mine in vinyl.
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