70-200mm L IS f2.8 II v f4 for bokeh

Started Mar 5, 2012 | Discussions thread
Shop cameras & lenses ▾
ForumParentFirstPreviousNextNext unread
Flat view
Phil King
Contributing MemberPosts: 588Gear list
70-200mm L IS f2.8 II v f4 for bokeh
Mar 5, 2012


I'm about to invest in the now relatively attractively priced 5D MK II and a couple of lenses. My interests are portraits (children mainly) where I love using shallow depth of field, and landscapes.

I am planning to buy the 24-70mm f2.8 and then a 70-200mm to cover the range. I can afford either the f2.8 or the f4 IS 70-200mm zooms but what I really need is portability and the ability to get decent bokeh. The f2.8 is a lot of glass as well as a lot of cash, whereas the f4 seems much easier to carry around.

Reading the reviews both are very well thought of in terms of sharpness, and one comment I read of the f4 was that this lens is not a poor man's f2.8. Clearly it won't be as good in low light as the f2.8 but I am thinking that at the longer focal lengths in the range, the DOF is going to be pretty shallow at f4 anyway - so do I really need the f2.8?

Using a calculator I worked out that at say 135mm focal length and the subject at 12 feet, f4 gives a DOF of 0.56ft (which my simple mind thinks of as the depth of a person!). Would that not give me good background blur?

Similarly at 200mm focal length, and the subject at 18 feet, f4 gives a similar DOF (0.56ft).

Can any of you 70-200mm f4 L IS owners out there post any comments on their experience - any example images?

Thank you.

-- hide signature --


 Phil King's gear list:Phil King's gear list
Canon EOS 40D Canon EF 50mm f/1.4 USM Canon EF-S 10-22mm f/3.5-4.5 USM Canon EF-S 17-85mm f/4-5.6 IS USM Canon EF-S 60mm f/2.8 Macro USM
Canon EOS 5D
If you believe there are incorrect tags, please send us this post using our feedback form.
ForumParentFirstPreviousNextNext unread
Flat view
Post (hide subjects)Posted by
ForumParentFirstPreviousNextNext unread
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow