>From: "Bill Green" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: EOS Who has regretted buying the 70-200/2.8?
>Date: Thu, 14 Dec 2000 09:42:27 -0700
>>While you can still freeze a subject with fast film and the f4 lens, you
>>lose that wonderful background blur at f2.8
There is very little difference in the amount of background blur between
f2.8 and f4. Assuming the same magnification of the subject, the increase in
dof from f2.8 to f4 is really quite minimum.
Try stopping down the 70-200 f2.8 to f4 and notice that the decrease in the
amount of background blur is negligible.
DOF doubles everytime the 'f-number' doubles. There is to say, background is
twice as blur from f2.8 --> f5.6.
My point is:--- YOU DON'T NEED A 7-2 F2.8 LENS TO CREATE NICE BACKGROUND
BLUR.
>>I guess I consider the 70-200 to be something of a pointless lens.
I agree. Not wide enough (70mm) and not long enough (200mm) for most
application.
>>I think you are much better off with a 100-400 --
Very versatile lens indeed. Covers almost all the long lens needs. The 1-4IS
maintains an aperture of f4.5 (only ~1 stops slower than f2.8) from 100mm to
about 250mm.
>it (1-4IS) is just a more useful lens for
>everything but sports and portraits.
Actually the 1-4IS makes a good portraits lens too with its f4.5 aperture at
250mm.
The only complain I have of the 1-4IS is that the zooming action exposes
quite abit of the lens barrel which will take in dirt.
Tristan
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