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Comparison: 70-200 f4 vs f2.8

cwils02

HIXSON, US
826 posts

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"RE: Comparison: 70-200 f4 vs f2.8"

cwils02 Gold Member Nikonian since 19th Apr 2012
Wed 09-Jan-13 04:14 AM

>If I switch to an f/4 lens on the same camera, either I will
>have to lower the shutter speed to 1/80th or raise the ISO to
>102,400. If I choose the first, I will get more motion
>blur in the subject, and if I choose the second I will
>get reduced dynamic range and increased noise. It doesn't
>even matter if the lens itself is better; subject movement and
>digital noise are outside the control of the optics.

Brian,

There are so many posts on the subject, point & counterpoint, but I think I at least understand the points in this post of yours. I don't have either lens. If someone wishes to send me one of both, I will test the heck out them (might even lose the return address).

Okay, Brian, here is what I understand. I understand that there are very real & legitimate needs where larger aperture is absolutely necessary.

What I don't understand is your motion blur argument. My understanding was that the improvement in VRIII would gain at least one, maybe two stops over VRII. My thought from this is--from your example--that there should be no more motion blur between VRII @ f/2.8 than VRIII @ f/4 with all other settings/conditions being equal. I will give you that DR & Noise could well be affected.

Now perhaps the thing that I don't understand is whether there is a difference between motion blur caused by the subject's motion, and that caused by movement of the camera; and by how well VR handles either of those.

I am not trying to be confrontational nor argumentative. I am just trying to understand. Thanks for clarifying any of this for me.

Charlie

Visit my Nikonians gallery.

This is a hot, active topic! Comparison: 70-200 f4 vs f2.8 [View all] , LMMiller9 Silver Member , Tue 01-Jan-13 04:06 PM
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