Great question, thanks for posting.


Quote Originally Posted by realityinabox
Does anybody own both the 70-200 2.8II and the f4 IS version, and preferably a FF body?

I have a FF body and the f/4 IS, but not the f/2.8 IS II.


Quote Originally Posted by realityinabox
I'm wondering if the extra stop is worth the extra $1500 in terms of bokeh alone.

Well, it depends on what you mean by the word "bokeh". When most photographers use that word, what they are really referring to is defocus blur, such as background blur. If that's what you are referring to, then I would say yes, it's worth it. The extra stop will result in exactly 1.4 times more background blur. That is, the diameter of defocused point of light will be 1.4X wider.


However, if you are referring to the actual quality of the defocus blur, and not the quantity, then I can't help you answer your question.