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<blockquote data-quote="Disorderly" data-source="post: 176286" data-attributes="member: 10297">I've had the 70-200mm F/2.8 for ages.&nbsp; I hardly ever use it; it's too heavy for me to handhold for very long, and too big to fit in my camera bag.&nbsp; I got the F/4 recently and love it.&nbsp; The image quality is amazing, it's narrow enough to fit in my bag, and it weighs barely more than the 24-70mm F/2.8 I use most of the time.&nbsp; It's a compromise, I know, but one I'm very happy with.One difference between the F/4 and the F/2.8 is in efficiency.&nbsp; As an experiment I tried shooting the same setup with both lenses, as well as the 85mm F/1.8.&nbsp; At 85mm and F/4, the 2.8 was about 1/3 stop brighter than the 4, and the 85mm was about 1/3 stop brighter than that.&nbsp; Not surprised that a prime suffers less light loss than a zoom (I'd seen the same thing when I switch to the 105mm), but wasn't expecting so great a difference between two zooms.I've heard it said that the best camera is the one you have with you.&nbsp; By that measure, the F/4 beats the F/2.8 most every time.&nbsp; It's the one I have with me.</blockquote>

[QUOTE="Disorderly, post: 176286, member: 10297"] I've had the 70-200mm F/2.8 for ages. I hardly ever use it; it's too heavy for me to handhold for very long, and too big to fit in my camera bag. I got the F/4 recently and love it. The image quality is amazing, it's narrow enough to fit in my bag, and it weighs barely more than the 24-70mm F/2.8 I use most of the time. It's a compromise, I know, but one I'm very happy with. One difference between the F/4 and the F/2.8 is in efficiency. As an experiment I tried shooting the same setup with both lenses, as well as the 85mm F/1.8. At 85mm and F/4, the 2.8 was about 1/3 stop brighter than the 4, and the 85mm was about 1/3 stop brighter than that. Not surprised that a prime suffers less light loss than a zoom (I'd seen the same thing when I switch to the 105mm), but wasn't expecting so great a difference between two zooms. I've heard it said that the best camera is the one you have with you. By that measure, the F/4 beats the F/2.8 most every time. It's the one I have with me. [/QUOTE]

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